Waterworks andSewerage of Nagoya

https://www.water.city.nagoya.jp/

Waterworks and Sewerage of Nagoya

Contents

Preface
Located in central Japan, Nagoya has developed into a political, economic, and cultural

1

Water Circulates

03

2

Waterworks of Nagoya

05

3

Sewerage of Nagoya

11

4

Heavy Rain Preparedness

19

5

Earthquake Preparedness

21

6

Public Relations Activities

24

7

International Cooperation

24

8

History of Nagoya's Water Supply and Sewerage Systems

25

metropolitan hub in the Chubu region.
With the bountiful Kiso River as its source, the history of Nagoya's waterworks dates backto 1914, and it has provided over 100 years of stable, uninterrupted water service to theregion. Nagoya's sewerage service began in 1912 and has been improving water quality
and managing rainwater run-off for over 100 years.
We at the Nagoya City Waterworks & Sewerage Bureau continue to strive to provide ourcustomers with reliable, sustainable service.

Nagoya's location

Nagoya

Tokyo
Aichi

Location
E longitude 136°47'30"-137°3'39"
N latitude 35°2'2"-35°15'37"
Area : Approximately 326.50km2
East-West distance : 24.52km
North-South distance : 25.13km

01

Japan

02

Waterworks and Sewerage of Nagoya

Contents

Preface
Located in central Japan, Nagoya has developed into a political, economic, and cultural

1

Water Circulates

03

2

Waterworks of Nagoya

05

3

Sewerage of Nagoya

11

4

Heavy Rain Preparedness

19

5

Earthquake Preparedness

21

6

Public Relations Activities

24

7

International Cooperation

24

8

History of Nagoya's Water Supply and Sewerage Systems

25

metropolitan hub in the Chubu region.
With the bountiful Kiso River as its source, the history of Nagoya's waterworks dates backto 1914, and it has provided over 100 years of stable, uninterrupted water service to theregion. Nagoya's sewerage service began in 1912 and has been improving water quality
and managing rainwater run-off for over 100 years.
We at the Nagoya City Waterworks & Sewerage Bureau continue to strive to provide ourcustomers with reliable, sustainable service.

Nagoya's location

Nagoya

Tokyo
Aichi

Location
E longitude 136°47'30"-137°3'39"
N latitude 35°2'2"-35°15'37"
Area : Approximately 326.50km2
East-West distance : 24.52km
North-South distance : 25.13km

01

Japan

02

1

Wa t e r C i r c u l a t e s

Ocean water is warmed by the sun and evaporates to form clouds. Water then falls back to earth from the clouds as rain andsnow, which flow down mountains into rivers and eventually back to the ocean. The cycle begins again as water from theocean evaporates to form clouds and then falls as rain.
Nagoya City Waterworks & Sewerage Bureau draws water from rivers, and after purifying it for drinking, delivers it tohouseholds. The sewerage department collects dirty, used water and returns it to the environment after it has been treated.

Water supply and sewerage services play a vital role in the water cycle and the environment around us.

Rain

Dam

Water
IntakeWater
Distribution
Tower

Water
IntakePlantr
ate PipeWn
Raw issiomnsTra

Water Purification Plant

Groundwater

Water
Distribution
StationWater Transmission pipe

Water
Distribution
Pipe

Water
Treatment
Plant
Rainwater
Reservoir Facility

Evaporation

Sewage Pipe
SludgeTreatment
Plant

Overview of the Water Cycle
1 Evaporated ocean water forms clouds and rain falls from clouds which flows into rivers.

3 Water drawn from rivers is purified to make drinking water.
4 Drinking water is sent through water distribution pipes to households.
5 Households use drinking water.

03

6 Used (dirty) water flows into sewage pipes.
Sewerage

Waterworks

2 Water is drawn from rivers.

7 Wastewater is treated at water treatment plants.
8 Treated water is returned to rivers and the ocean.
The cycle repeats again.

04

1

Wa t e r C i r c u l a t e s

Ocean water is warmed by the sun and evaporates to form clouds. Water then falls back to earth from the clouds as rain andsnow, which flow down mountains into rivers and eventually back to the ocean. The cycle begins again as water from theocean evaporates to form clouds and then falls as rain.
Nagoya City Waterworks & Sewerage Bureau draws water from rivers, and after purifying it for drinking, delivers it tohouseholds. The sewerage department collects dirty, used water and returns it to the environment after it has been treated.

Water supply and sewerage services play a vital role in the water cycle and the environment around us.

Rain

Dam

Water
IntakeWater
Distribution
Tower

Water
IntakePlantr
ate PipeWn
Raw issiomnsTra

Water Purification Plant

Groundwater

Water
Distribution
StationWater Transmission pipe

Water
Distribution
Pipe

Water
Treatment
Plant
Rainwater
Reservoir Facility

Evaporation

Sewage Pipe
SludgeTreatment
Plant

Overview of the Water Cycle
1 Evaporated ocean water forms clouds and rain falls from clouds which flows into rivers.

3 Water drawn from rivers is purified to make drinking water.
4 Drinking water is sent through water distribution pipes to households.
5 Households use drinking water.

03

6 Used (dirty) water flows into sewage pipes.
Sewerage

Waterworks

2 Water is drawn from rivers.

7 Wastewater is treated at water treatment plants.
8 Treated water is returned to rivers and the ocean.
The cycle repeats again.

04

2

Wa t e r w o r k s o f N a g o y aWith the bountiful Kiso River as its source, Nagoya's waterworks began supplying households with water from its

Nabeyaueno Water Purification Plant in September 1914. For over 100 years, Nagoya's Waterworks has supplied customers

with uninterrupted water service and continues to provide great tasting water and reliable service today.
By rigorously maintaining our water sources, plants, pipes, and water quality, we strive to provide reliable, delicious drinking

water to customers going forward.

Dam

Water Intake Plant
Water
IntakeChemical Feeding Facility

Water Purification Plant

Raw Water
Transmission Pipe

Disinfection Facility

Reception Well
Water Conveying/
Distribution Pumps

Sedimentation Basin

Water Distribution Station
Water
Distribution
Pumps

Filtration Basin(Rapid Filtration Basin)
Water
Distribution
Reservoir

Water Source/ Intake Plant

Water
Transmission
pipe

Water
Distribution
Reservoir

Water
Distribution
Tower

Water
Distribution
Pipe

Overview of a Water Purification Plant

Water is drawn from the Kiso River and sent to a water purification plant after the removal of sand and otherdebris.

Water Purification Plant
Kiso River water arriving from the intake plant is purified for drinking here.

Water Distribution Station/ Pumping Station
Drinking water from the purification plant is stored here temporarily before being sent to customers.

Water Distribution Pipe
A network of underground water distribution pipes carries drinking water from the water distribution stations/

1Reception Well

2Sedimentation Basin

3Disinfection Facility

Water coming from the Kiso
River flows into here.

Chemicals are added to theriver water that causes thecloudy sediments to clump
together and settle to thebottom.

Chlorine is added to the water
after it has passed throughthe sedimentation basin.

4Filtration Basin(Rapid Filtration Basin)

5Water Conveying/
Distribution Pumps

The disinfected water passes
through a layer of sand to
remove smaller particulatematter remaining after the
sedimentation basin.

Water is pressurized by apump and sent onward to awater distribution station andthen customers.

pumping stations to households.

05

06

2

Wa t e r w o r k s o f N a g o y aWith the bountiful Kiso River as its source, Nagoya's waterworks began supplying households with water from its

Nabeyaueno Water Purification Plant in September 1914. For over 100 years, Nagoya's Waterworks has supplied customers

with uninterrupted water service and continues to provide great tasting water and reliable service today.
By rigorously maintaining our water sources, plants, pipes, and water quality, we strive to provide reliable, delicious drinking

water to customers going forward.

Dam

Water Intake Plant
Water
IntakeChemical Feeding Facility

Water Purification Plant

Raw Water
Transmission Pipe

Disinfection Facility

Reception Well
Water Conveying/
Distribution Pumps

Sedimentation Basin

Water Distribution Station
Water
Distribution
Pumps

Filtration Basin(Rapid Filtration Basin)
Water
Distribution
Reservoir

Water Source/ Intake Plant

Water
Transmission
pipe

Water
Distribution
Reservoir

Water
Distribution
Tower

Water
Distribution
Pipe

Overview of a Water Purification Plant

Water is drawn from the Kiso River and sent to a water purification plant after the removal of sand and otherdebris.

Water Purification Plant
Kiso River water arriving from the intake plant is purified for drinking here.

Water Distribution Station/ Pumping Station
Drinking water from the purification plant is stored here temporarily before being sent to customers.

Water Distribution Pipe
A network of underground water distribution pipes carries drinking water from the water distribution stations/

1Reception Well

2Sedimentation Basin

3Disinfection Facility

Water coming from the Kiso
River flows into here.

Chemicals are added to theriver water that causes thecloudy sediments to clump
together and settle to thebottom.

Chlorine is added to the water
after it has passed throughthe sedimentation basin.

4Filtration Basin(Rapid Filtration Basin)

5Water Conveying/
Distribution Pumps

The disinfected water passes
through a layer of sand to
remove smaller particulatematter remaining after the
sedimentation basin.

Water is pressurized by apump and sent onward to awater distribution station andthen customers.

pumping stations to households.

05

06

Water Source/ Intake Plant

Misogawa Dam

Water Usage Rights

Nagano Prefecture

Although Nagoya used to receive water only from
Iwaya Damnatural inflows from the Kiso River, the expansion of thecity meant that additional water sources were needed
and so Nagoya acquired water rights by building the
Kisogawa Integrated Canal System (which includes

Gifu Prefecture
Ibi
River

Asashi Intake Plant

Asahi Head Race

Kisogawa Integrated Canal System Flow Rate:

11.94m3/ second

Nagaragawa Estuary Barrage Flow Rate:

2.00m3/ second

Misogawa Dam Flow Rate:

0.50m3/ second

Tokuyama Dam Flow Rate:

1.00m3/ second

Total:

23.00m3/ second

Ibigawa-cho, Ibi-gun, Gifu Prefecture

Total Reservoir Capacity: 660 million m3
Start of Operation:

April 1, 2008

Toriimatsu Sedimentation Basin

Kisogawa Barrage

Inuyama Head Race

Nabeyaueno Water Purification Plant

Oharu Water Purification Plant

NagoyaNagaragawa Estuary BarrageRiver via the Inuyama Intake Plant and the Asahi Intake
Plant. Water drawn from the Inuyama Intake Plant is

Kasugai Water Purification Plant

7.56m3/ second

Tokuyama Dam
Location:

Inuyama Intake Plant

Nagaragawa Estuary Barrage, the Misogawa Dam andNagoya's water systems receive water from the Kiso

Kiso
River

NagaraRiver

the Iwaya Dam, the Kisogawa Barrage) along with thethe Tokuyama Dam.

Hida
River

Mase
River

Tokuyama Dam

Kiso River Natural Flow Rate:

Aichi Prefecture

Intake Plant

Mie Prefecture

sent to the Kasugai Water Purification Plant and the
Nabeyaueno Water Purification Plant, and water drawn

Ise Bay

from the Asahi Intake Plant is sent to the Oharu Water
Purification Plant.
Water Source Facilities/ Nagoya City's Water-related Facilities Location Diagram

Inuyama Intake Plant

Asahi Intake Plant

Location of Office: 2-1 Kitakoken, Inuyama, Inuyama City

Location of Office: 21 Kawata, Kamisobue, Ichinomiya City

Water Source Facility

Water Purification Plant
Nagoya's water system has three purification plants,
and the Nabeyaueno Water Purification Plant employs
a rapid filtration basin method in addition to a slow
filtration basin method for water purification. Purification
Iwaya Dam

Kisogawa Barrage

Location:
Gero City, Gifu Prefecture
Total Reservoir Capacity: 173.5 million m3
Start of Operation:
April 1, 1977

Location:Start of Operation:

Left bank/ Inazawa City, Aichi Prefecture
Right bank/Hashima City, Gifu Prefecture
April 1, 1983

plants are also responsible for regulating the amountof intake water from the Kiso River and adjusting the

Nabeyaueno Water Purification Plant

pressure under which water is sent from distribution/

Location: 1-33 Miyanokoshi-cho, Chikusa-ku, Nagoya City

pumping stations.

07

◆
◆

Water Distribution Capacity:
Start of Operation:

290,000 m3/day
September 1914

Nagaragawa Estuary Barrage

Misogawa Dam

Oharu Water Purification Plant

Kasugai Water Purification Plant

Location:

Kuwana City, Mie Prefecture

Start of Operation:

April 1, 1995

Location:
Kisomura, Kiso-gun, Nagano Prefecture
Total Reservoir Capacity: 61 million m3
Start of Operation:
December 1, 1996

Location: 983 Kamirokutanchi, Horinouchi, Oharu-cho, Ama-gun◆ Water Distribution Capacity:
544,000 m3/day◆ Start of Operation:
March 1946

Location: 4957 Takaki-cho, Kasugai City
◆ Water Distribution Capacity:
590,000 m3/day◆ Start of Operation:
April 196908

Water Source/ Intake Plant

Misogawa Dam

Water Usage Rights

Nagano Prefecture

Although Nagoya used to receive water only from
Iwaya Damnatural inflows from the Kiso River, the expansion of thecity meant that additional water sources were needed
and so Nagoya acquired water rights by building the
Kisogawa Integrated Canal System (which includes

Gifu Prefecture
Ibi
River

Asashi Intake Plant

Asahi Head Race

Kisogawa Integrated Canal System Flow Rate:

11.94m3/ second

Nagaragawa Estuary Barrage Flow Rate:

2.00m3/ second

Misogawa Dam Flow Rate:

0.50m3/ second

Tokuyama Dam Flow Rate:

1.00m3/ second

Total:

23.00m3/ second

Ibigawa-cho, Ibi-gun, Gifu Prefecture

Total Reservoir Capacity: 660 million m3
Start of Operation:

April 1, 2008

Toriimatsu Sedimentation Basin

Kisogawa Barrage

Inuyama Head Race

Nabeyaueno Water Purification Plant

Oharu Water Purification Plant

NagoyaNagaragawa Estuary BarrageRiver via the Inuyama Intake Plant and the Asahi Intake
Plant. Water drawn from the Inuyama Intake Plant is

Kasugai Water Purification Plant

7.56m3/ second

Tokuyama Dam
Location:

Inuyama Intake Plant

Nagaragawa Estuary Barrage, the Misogawa Dam andNagoya's water systems receive water from the Kiso

Kiso
River

NagaraRiver

the Iwaya Dam, the Kisogawa Barrage) along with thethe Tokuyama Dam.

Hida
River

Mase
River

Tokuyama Dam

Kiso River Natural Flow Rate:

Aichi Prefecture

Intake Plant

Mie Prefecture

sent to the Kasugai Water Purification Plant and the
Nabeyaueno Water Purification Plant, and water drawn

Ise Bay

from the Asahi Intake Plant is sent to the Oharu Water
Purification Plant.
Water Source Facilities/ Nagoya City's Water-related Facilities Location Diagram

Inuyama Intake Plant

Asahi Intake Plant

Location of Office: 2-1 Kitakoken, Inuyama, Inuyama City

Location of Office: 21 Kawata, Kamisobue, Ichinomiya City

Water Source Facility

Water Purification Plant
Nagoya's water system has three purification plants,
and the Nabeyaueno Water Purification Plant employs
a rapid filtration basin method in addition to a slow
filtration basin method for water purification. Purification
Iwaya Dam

Kisogawa Barrage

Location:
Gero City, Gifu Prefecture
Total Reservoir Capacity: 173.5 million m3
Start of Operation:
April 1, 1977

Location:Start of Operation:

Left bank/ Inazawa City, Aichi Prefecture
Right bank/Hashima City, Gifu Prefecture
April 1, 1983

plants are also responsible for regulating the amountof intake water from the Kiso River and adjusting the

Nabeyaueno Water Purification Plant

pressure under which water is sent from distribution/

Location: 1-33 Miyanokoshi-cho, Chikusa-ku, Nagoya City

pumping stations.

07

◆
◆

Water Distribution Capacity:
Start of Operation:

290,000 m3/day
September 1914

Nagaragawa Estuary Barrage

Misogawa Dam

Oharu Water Purification Plant

Kasugai Water Purification Plant

Location:

Kuwana City, Mie Prefecture

Start of Operation:

April 1, 1995

Location:
Kisomura, Kiso-gun, Nagano Prefecture
Total Reservoir Capacity: 61 million m3
Start of Operation:
December 1, 1996

Location: 983 Kamirokutanchi, Horinouchi, Oharu-cho, Ama-gun◆ Water Distribution Capacity:
544,000 m3/day◆ Start of Operation:
March 1946

Location: 4957 Takaki-cho, Kasugai City
◆ Water Distribution Capacity:
590,000 m3/day◆ Start of Operation:
April 196908

Water Distribution Stations/ Pumping Stations

Nagoya's Water Distribution System Diagram

After the water undergoes purification at a purification plant, it is either sent directly to customers or reaches themWater Purification Plant

via a distribution or pumping station. Drinking water is stored in water distribution reservoirs and towers at water

Water Distribution Station/ Booster Pumping Station
Route of Water Flow

distributions/ pumping stations. The height of these stations is used to regulate water pressure so that it reaches

Kiso River

Inuyama Intake Plant

Route of Water Distribution
Water Distribution Area

the customer at the optimal pressure.

Current (as of the end of FY2018)

Nagoya's water system has eight water distribution stations and three pumping stations.

Kasugai Water
Purification Plant

Togoku High Zone
Booster Pumping
Togoku Booster Pumping

Togoku Booster
Pumping Station

ShidamiMid Zone

Asashi Intake Plant

Shidami Water
Distribution Station

Meihoku

Shidami High Zone
Midorigaoka
Depressurization

Oharu Water
Purification Plant

Idaka Water
Distribution Station

Idaka
Low Zone

Nabeyaueno Water
Purification Plant

Nozomigaoka
Booster Pumping

Heiwa Park Water
Distribution Station

Nozomigaoka Booster
Pumping Station

Higashiyama Water
Distribution Station

Idaka
Depressurization

Higashiyama/Oharu

Gokuraku Booster
Pumping Station

Heiwa Park

Gokuraku
Booster Pumping

Idaka
High Zone

Mizuho Water
Distribution Station

MizuhoHigashiyama
Water Distribution Station(Chikusa-ku)

Idaka
Water Distribution Station(Meito-ku)

Narumi
Water Distribution Station(Midori-ku)

ShidamiWater Distribution Station(Moriyama-ku)

Hirabari
Depressurization

ShimadaDepressurization

Nakagawa Nishi Water
Distribution Station

Nakagawa Nishi

NarumiHigh Zone

Narumi Water
Distribution Station

Narumi
Narumi
Higashiyama/ Low Zone Mid Zone
Oharu
Suwayama
Depressurization

Heiwa Park
Water Distribution Station(Chikusa-ku)

Nakagawa Nishi
Water Distribution Station(Minato-ku)

MizuhoWater Distribution Station(Mizuho-ku)

Kasugano
Water Distribution Station(Minami-ku)

Water Intake Plant Water Purification Plant

Water Distribution Station/ Pumping Station

Meihoku
ShidamiMid Zone/High Zone
(Midorigaoka Depressurization)

ShidamiWater Distribution Station
Togoku Booster Pumping Station

InuyamaNozomigaoka
Booster Pumping Station(Meito-ku)

Gokuraku
Booster Pumping Station(Meito-ku)

Kasugai

TogokuBooster Pumping Station(Moriyama-ku)

Nabeyaueno
Asahi

09

Water Distribution Area

Oharu

Idaka
Water Distribution Station

Togoku Booster Pumping
Togoku High Zone Booster Pumping
Idaka
Low Zone/High Zone
Idaka Depressurization
Shimada Depressurization

Heiwa Park Water Distribution Station

Heiwa Park

Nozomigaoka Booster Pumping Station

Nozomigaoka Booster Pumping

Gokuraku Booster Pumping Station

Gokuraku Booster Pumping

Mizuho Water Distribution Station

MizuhoNarumi Water Distribution Station

NarumiLow Zone/Mid Zone/High Zone
Hirabari Depressurization
Suwayama Depressurization

Higashiyama Water Distribution Station

Nakagawa Nishi Water Distribution Station

Higashiyama/Oharu
Nakagawa Nishi

10Water Distribution Stations/ Pumping Stations

Nagoya's Water Distribution System Diagram

After the water undergoes purification at a purification plant, it is either sent directly to customers or reaches themWater Purification Plant

via a distribution or pumping station. Drinking water is stored in water distribution reservoirs and towers at water

Water Distribution Station/ Booster Pumping Station
Route of Water Flow

distributions/ pumping stations. The height of these stations is used to regulate water pressure so that it reaches

Kiso River

Inuyama Intake Plant

Route of Water Distribution
Water Distribution Area

the customer at the optimal pressure.

Current (as of the end of FY2018)

Nagoya's water system has eight water distribution stations and three pumping stations.

Kasugai Water
Purification Plant

Togoku High Zone
Booster Pumping
Togoku Booster Pumping

Togoku Booster
Pumping Station

ShidamiMid Zone

Asashi Intake Plant

Shidami Water
Distribution Station

Meihoku

Shidami High Zone
Midorigaoka
Depressurization

Oharu Water
Purification Plant

Idaka Water
Distribution Station

Idaka
Low Zone

Nabeyaueno Water
Purification Plant

Nozomigaoka
Booster Pumping

Heiwa Park Water
Distribution Station

Nozomigaoka Booster
Pumping Station

Higashiyama Water
Distribution Station

Idaka
Depressurization

Higashiyama/Oharu

Gokuraku Booster
Pumping Station

Heiwa Park

Gokuraku
Booster Pumping

Idaka
High Zone

Mizuho Water
Distribution Station

MizuhoHigashiyama
Water Distribution Station(Chikusa-ku)

Idaka
Water Distribution Station(Meito-ku)

Narumi
Water Distribution Station(Midori-ku)

ShidamiWater Distribution Station(Moriyama-ku)

Hirabari
Depressurization

ShimadaDepressurization

Nakagawa Nishi Water
Distribution Station

Nakagawa Nishi

NarumiHigh Zone

Narumi Water
Distribution Station

Narumi
Narumi
Higashiyama/ Low Zone Mid Zone
Oharu
Suwayama
Depressurization

Heiwa Park
Water Distribution Station(Chikusa-ku)

Nakagawa Nishi
Water Distribution Station(Minato-ku)

MizuhoWater Distribution Station(Mizuho-ku)

Kasugano
Water Distribution Station(Minami-ku)

Water Intake Plant Water Purification Plant

Water Distribution Station/ Pumping Station

Meihoku
ShidamiMid Zone/High Zone
(Midorigaoka Depressurization)

ShidamiWater Distribution Station
Togoku Booster Pumping Station

InuyamaNozomigaoka
Booster Pumping Station(Meito-ku)

Gokuraku
Booster Pumping Station(Meito-ku)

Kasugai

TogokuBooster Pumping Station(Moriyama-ku)

Nabeyaueno
Asahi

09

Water Distribution Area

Oharu

Idaka
Water Distribution Station

Togoku Booster Pumping
Togoku High Zone Booster Pumping
Idaka
Low Zone/High Zone
Idaka Depressurization
Shimada Depressurization

Heiwa Park Water Distribution Station

Heiwa Park

Nozomigaoka Booster Pumping Station

Nozomigaoka Booster Pumping

Gokuraku Booster Pumping Station

Gokuraku Booster Pumping

Mizuho Water Distribution Station

MizuhoNarumi Water Distribution Station

NarumiLow Zone/Mid Zone/High Zone
Hirabari Depressurization
Suwayama Depressurization

Higashiyama Water Distribution Station

Nakagawa Nishi Water Distribution Station

Higashiyama/Oharu
Nakagawa Nishi

10

3

Sewerage of Nagoya

Since service began in November 1912, Nagoya's sewerage systems have played a vital role as an integral base of

infrastructure, providing a safe and secure living environment for those living in the area for over 100 years.

The Nagoya City Waterworks & Sewerage Bureau aims to continue its history of providing customers with the highest levelof service by performing necessary maintenance and renewals to its infrastructure, taking precautionary measures against

earthquakes and flooding, improving the water environment, and cutting greenhouse gas emissions.

Sewage Relay
Pumping Station

ManholeSludge Concentrator

Gravity
Flow

Dehydrator

GritChamber

SewagePipe

Primary
Sedimentation
Basin
Pump

Sludge Treatment Plant
Incinerator
Exhaust Gas
Treatment
SystemAsh
Hopper

Water Treatment Plant

Reaction
Tank
Final
Sedimentation
Basin
Disinfection
Facility

Sent forRecycling

SmokestackSludgeSewage Pipe
Wastewater flows through a network of undergroundsewage pipes before making its way to water treatment

Discharge
Outletplants.

11

Water Treatment Plant

Sludge Treatment Plant

Here the wastewater that arrives from sewage pipes is treated and cleaned before being returned to rivers.

Sludge generated at the water treatment plant is concentrated, dehydrated, and finally incinerated at this facility.

1Grit Chamber

2Primary Sedimentation Basin

3Reaction Tank

4Final Sedimentation Basin

After arriving at the water treatment
plant, wastewater first enters thisgrit chamber where it slowly flows
through the grit, allowing sand andother debris to settle to the bottom
and be removed.
Larger debris is caught andremoved with a screen.

In the primary sedimentation basin,
microcontaminants that remain
after the grit chamber settle andare removed slowly over time.

Sludge containing microorganisms
called "activated sludge" iscombined with air and wastewater,then thoroughly mixed.
M i c r o o r g a n i s m s t h e n a c t i ve l ybreak down and adsorb impurities,
thereby cleaning the water.

The water and activated sludge
purified by the reaction tank thenflow into this basin. The activatedsludge slowly settles over time, andthe resulting clean water near thesurface is disinfected and returnedto the river. Some of the settled
activated sludge will be returned to
the reaction tank, and the rest will besent to the sludge treatment plant.

1Sludge Concentrator

2Dehydrator

3Incinerator

4Exhaust Gas Treatment System

Sludge from the water treatment
plant is filtered and concentrated
along a conveyer belt.

Moisture is extracted from the sludgeu n d e r p re s s u re. T h e re m a in in gmaterial is called dehydration cake.

The incinerator burns the dehydrated
cake, leaving ash.

Hazardous substances from thegas produced during incineration of
the dehydrated cake are removed
to keep the air clean.

123

Sewerage of Nagoya

Since service began in November 1912, Nagoya's sewerage systems have played a vital role as an integral base of

infrastructure, providing a safe and secure living environment for those living in the area for over 100 years.

The Nagoya City Waterworks & Sewerage Bureau aims to continue its history of providing customers with the highest levelof service by performing necessary maintenance and renewals to its infrastructure, taking precautionary measures against

earthquakes and flooding, improving the water environment, and cutting greenhouse gas emissions.

Sewage Relay
Pumping Station

ManholeSludge Concentrator

Gravity
Flow

Dehydrator

GritChamber

SewagePipe

Primary
Sedimentation
Basin
Pump

Sludge Treatment Plant
Incinerator
Exhaust Gas
Treatment
SystemAsh
Hopper

Water Treatment Plant

Reaction
Tank
Final
Sedimentation
Basin
Disinfection
Facility

Sent forRecycling

SmokestackSludgeSewage Pipe
Wastewater flows through a network of undergroundsewage pipes before making its way to water treatment

Discharge
Outletplants.

11

Water Treatment Plant

Sludge Treatment Plant

Here the wastewater that arrives from sewage pipes is treated and cleaned before being returned to rivers.

Sludge generated at the water treatment plant is concentrated, dehydrated, and finally incinerated at this facility.

1Grit Chamber

2Primary Sedimentation Basin

3Reaction Tank

4Final Sedimentation Basin

After arriving at the water treatment
plant, wastewater first enters thisgrit chamber where it slowly flows
through the grit, allowing sand andother debris to settle to the bottom
and be removed.
Larger debris is caught andremoved with a screen.

In the primary sedimentation basin,
microcontaminants that remain
after the grit chamber settle andare removed slowly over time.

Sludge containing microorganisms
called "activated sludge" iscombined with air and wastewater,then thoroughly mixed.
M i c r o o r g a n i s m s t h e n a c t i ve l ybreak down and adsorb impurities,
thereby cleaning the water.

The water and activated sludge
purified by the reaction tank thenflow into this basin. The activatedsludge slowly settles over time, andthe resulting clean water near thesurface is disinfected and returnedto the river. Some of the settled
activated sludge will be returned to
the reaction tank, and the rest will besent to the sludge treatment plant.

1Sludge Concentrator

2Dehydrator

3Incinerator

4Exhaust Gas Treatment System

Sludge from the water treatment
plant is filtered and concentrated
along a conveyer belt.

Moisture is extracted from the sludgeu n d e r p re s s u re. T h e re m a in in gmaterial is called dehydration cake.

The incinerator burns the dehydrated
cake, leaving ash.

Hazardous substances from thegas produced during incineration of
the dehydrated cake are removed
to keep the air clean.

12Roles of Sewerage Systems

Water Treatment Plant

Improving the Environment.

Protecting the City from Heavy Rain.

Pit latrines and septic tanks become obsolete

Sewerage systems help protect cities from flooding

so that run-off discharged into street gutters is

by pumping excess rainwater and diverting it tolimited to rainwater only, making for a cleaner living

rivers and rainwater reservoirs.

environment.

Keeping Rivers and the Ocean Clean.

Using Resources Effectively.

Wastewater from households, factories, etc. is

Treated water can be reused, and the heat

treated at water treatment plants prior to being

energy held within wastewater can be used inreturned to rivers and the ocean.

air conditioning systems as a heat source. The
ash produced by incinerating sludge can also be
used as fuel or in the manufacturing of building
materials.

There are fifteen water treatment plants in the city of Nagoya processing around 1 million m3 of wastewater perday. Sludge produced at these water treatment plants is then sent through specialized pipelines to three sludge
treatment plants where it is processed.
Water treatment plants operate and are monitored 24 hours a day. Periodic water quality testing and analysis ofboth wastewater and treated water are performed to ensure proper treatment.

Horidome Water Treatment Plant

Atsuta Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:• Treatment System:• Treatment Capacity:• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1930

There are two types of sewerage: wastewater from households and rainwater. Flow together into one pipe, is known as a "combined sewerage system,"and sewerage that has separate pipes for wastewater and rainwater is called a "separate sewerage system." In Nagoya, around 40% of the sewerage
service area, including the north region of Shonai River, as well as the eastern hill region, uses the "separate sewerage system" with the remaining 60%of the area using the "combined sewerage system."

1324-2 Hanaomote-cho, Atsuta-ku
Parts of Naka-ku and Atsuta-ku
Standard Activated Sludge Process
60,000 m3/ day*• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1930

Tsuyuhashi Water Treatment Plant

Temmacho Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:

Two Types of Sewerage Disposal

1-1-12 Chiyoda, Naka-ku
Parts of Chikusa-ku, Higashi-ku, Naka-ku,
and Showa-ku
Standard Activated Sludge Process
200,000 m3/ day

10-50 Hirosumi-cho, Nakagawa-ku
Parts of Nishi-ku, Nakamura-ku, andNakagawa-ku
Anaerobic Anoxic-Oxic Process
80,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Nakagawa Canal• Year of Start of Operation: 1933

• Treatment System:• Treatment Capacity:

5-19 Momozono-cho, Mizuho-ku
Parts of Chikusa-ku, Showa-ku,
Mizuho-ku, and Minami-ku
Standard Activated Sludge Process
80,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1934

14

Roles of Sewerage Systems

Water Treatment Plant

Improving the Environment.

Protecting the City from Heavy Rain.

Pit latrines and septic tanks become obsolete

Sewerage systems help protect cities from flooding

so that run-off discharged into street gutters is

by pumping excess rainwater and diverting it tolimited to rainwater only, making for a cleaner living

rivers and rainwater reservoirs.

environment.

Keeping Rivers and the Ocean Clean.

Using Resources Effectively.

Wastewater from households, factories, etc. is

Treated water can be reused, and the heat

treated at water treatment plants prior to being

energy held within wastewater can be used inreturned to rivers and the ocean.

air conditioning systems as a heat source. The
ash produced by incinerating sludge can also be
used as fuel or in the manufacturing of building
materials.

There are fifteen water treatment plants in the city of Nagoya processing around 1 million m3 of wastewater perday. Sludge produced at these water treatment plants is then sent through specialized pipelines to three sludge
treatment plants where it is processed.
Water treatment plants operate and are monitored 24 hours a day. Periodic water quality testing and analysis ofboth wastewater and treated water are performed to ensure proper treatment.

Horidome Water Treatment Plant

Atsuta Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:• Treatment System:• Treatment Capacity:• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1930

There are two types of sewerage: wastewater from households and rainwater. Flow together into one pipe, is known as a "combined sewerage system,"and sewerage that has separate pipes for wastewater and rainwater is called a "separate sewerage system." In Nagoya, around 40% of the sewerage
service area, including the north region of Shonai River, as well as the eastern hill region, uses the "separate sewerage system" with the remaining 60%of the area using the "combined sewerage system."

1324-2 Hanaomote-cho, Atsuta-ku
Parts of Naka-ku and Atsuta-ku
Standard Activated Sludge Process
60,000 m3/ day*• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1930

Tsuyuhashi Water Treatment Plant

Temmacho Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:

Two Types of Sewerage Disposal

1-1-12 Chiyoda, Naka-ku
Parts of Chikusa-ku, Higashi-ku, Naka-ku,
and Showa-ku
Standard Activated Sludge Process
200,000 m3/ day

10-50 Hirosumi-cho, Nakagawa-ku
Parts of Nishi-ku, Nakamura-ku, andNakagawa-ku
Anaerobic Anoxic-Oxic Process
80,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Nakagawa Canal• Year of Start of Operation: 1933

• Treatment System:• Treatment Capacity:

5-19 Momozono-cho, Mizuho-ku
Parts of Chikusa-ku, Showa-ku,
Mizuho-ku, and Minami-ku
Standard Activated Sludge Process
80,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Shinhorikawa River• Year of Start of Operation: 1934

14

Nishiyama Water Treatment Plant

Yamazaki Water Treatment Plant

Shibata Water Treatment Plant

Uchide Water Treatment Plant• Location:

404 Sanko-cho, Meito-ku• Location:

2-3-96 Chuji, Minami-ku•Location:

2-40 Motoshibata-nishimachi, Minami-ku•Location:

122 Nakasu-cho, Nakagawa-ku• Treatment Area:

Parts of Chikusa-ku, and Meito-ku• Treatment Area:

Parts of Chikusa-ku, Showa-ku, Mizuho-ku,•Treatment Area:

Parts of Chikusa-ku, Showa-ku, Mizuho-ku,•Treatment Area:

Parts of Nakamura-ku, Nakagawa-ku, and• Treatment System:

Carrier Feed Type Anaerobic Anoxic-Oxic
Process• Treatment System:

Minato-ku, and Minami-ku
Standard Activated Sludge Process•Treatment System:

Minami-ku, Midori-ku, and Tempaku-ku
Standard Activated Sludge Process,•Treatment System:

Minato-ku
Standard Activated Sludge Process

15,000 m3/ day• Treatment Capacity:

120,000 m3/ day

Anaerobic Anoxic-Oxic Process
150,000 m3/ day•Treatment Capacity:

280,000 m3/ day*

• Treatment Capacity:• Sewerage System:
Separate System• Effluent Stream:
Ueda River• Year of Start of Operation: 1959

• Sewerage System:
Combined System• Effluent Stream:
Yamazaki River• Year of Start of Operation: 1960

•Treatment Capacity:

Iwatsuka Water Treatment Plant

Chitose Water Treatment Plant

Hojin Water Treatment Plant

Moriyma Water Treatment Plant• Location:• Location:• Treatment Area:•Location:
4-2501 Hojin, Minato-ku•Treatment Area:
Parts of Nakagawa-ku and Minato-ku•Treatment System:
Standard Activated Sludge Process•Treatment Capacity:
150,000 m3/ day•Sewerage System:
Combined System•Effluent Stream:
Shonai River•Year of Start of Operation: 1975

•Location:•Treatment Area:• Treatment Area:• Treatment System:• Treatment Capacity:

Honjinyashiki, Iwatsuka-cho,Nakamura-ku
Parts of Kita-ku, Nishi-ku, andNakamura-ku
Standard Activated Sludge Process
200,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Shonai River• Year of Start of Operation: 1964

•Sewerage System:•Effluent Stream:Tempaku River•Year of Start of Operation: 1971

• Year of Start of Operation: 1964

Meijo Water Treatment Plant

Narumi Water Treatment Plant

Ueda Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:•Location:•Treatment Area:• Treatment System:• Treatment Capacity:

1-3-3 Meijo, Kita-ku
Parts of Chikusa-ku, Higashi-ku,
Kita-ku, and Naka-ku
Standard Activated Sludge Process
100,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Horikawa River• Year of Start of Operation: 196515

• Treatment System:• Treatment Capacity:• Sewerage System:• Effluent Stream:

2-35-36 Chitose, Atsuta-ku
Parts of Atsuta-ku, Nakagawa-ku, andMinato-ku
Standard Activated Sludge Process
100,000 m3/ day
Combined System
Horikawa River

60,000 m3/day
Combined System (Partially a Separate System)

5-59 Urasato, Midori-ku
Parts of Midori-ku, and Tempaku-ku
Standard Activated Sludge Process
150,000 m3/ day• Sewerage System:
Separate System• Effluent Stream:Tempaku River• Year of Start of Operation: 1969

•Treatment System:•Treatment Capacity:•Sewerage System:

Combined System (Partially a Separate System)•Effluent Stream:
Shonai River•Year of Start of Operation: 1975

•Treatment System:

3-1 Komegase-cho, Kita-ku
Parts of Moriyama-ku, Chikusa-ku, Kita-ku,
and Meito-ku
Standard Activated Sludge Process

Anaerobic Anoxic-Oxic Membrane Bioreactor
128,000 m3/ day
5,000 m3/ day•Sewerage System:
Separate System (Partially a Combined System)•Effluent Stream:
Shonai River•Year of Start of Operation: 1978
•Treatment Capacity:

1-512 Uedaminami, Tempaku-ku
Parts of Chikusa-ku, Showa-ku, Midori-ku,
Meito-ku, and Tempaku-ku
Standard Activated Sludge Process
Carrier Feed Type Anaerobic Anoxic-Oxic
Process
90,000 m3/ day

30,000 m3/ day•Sewerage System:
Separate System•Effluent Stream:
Ueda River•Year of Start of Operation: 1982

* When high-efficacy anaerobic oxic treatment is used, treatment
capacities become 38,000 m3 / day and 255,000 m3 / day for the
Atsuta Water Treatment Plant and Uchide Water Treatment Plants,
respectively.

16

Nishiyama Water Treatment Plant

Yamazaki Water Treatment Plant

Shibata Water Treatment Plant

Uchide Water Treatment Plant• Location:

404 Sanko-cho, Meito-ku• Location:

2-3-96 Chuji, Minami-ku•Location:

2-40 Motoshibata-nishimachi, Minami-ku•Location:

122 Nakasu-cho, Nakagawa-ku• Treatment Area:

Parts of Chikusa-ku, and Meito-ku• Treatment Area:

Parts of Chikusa-ku, Showa-ku, Mizuho-ku,•Treatment Area:

Parts of Chikusa-ku, Showa-ku, Mizuho-ku,•Treatment Area:

Parts of Nakamura-ku, Nakagawa-ku, and• Treatment System:

Carrier Feed Type Anaerobic Anoxic-Oxic
Process• Treatment System:

Minato-ku, and Minami-ku
Standard Activated Sludge Process•Treatment System:

Minami-ku, Midori-ku, and Tempaku-ku
Standard Activated Sludge Process,•Treatment System:

Minato-ku
Standard Activated Sludge Process

15,000 m3/ day• Treatment Capacity:

120,000 m3/ day

Anaerobic Anoxic-Oxic Process
150,000 m3/ day•Treatment Capacity:

280,000 m3/ day*

• Treatment Capacity:• Sewerage System:
Separate System• Effluent Stream:
Ueda River• Year of Start of Operation: 1959

• Sewerage System:
Combined System• Effluent Stream:
Yamazaki River• Year of Start of Operation: 1960

•Treatment Capacity:

Iwatsuka Water Treatment Plant

Chitose Water Treatment Plant

Hojin Water Treatment Plant

Moriyma Water Treatment Plant• Location:• Location:• Treatment Area:•Location:
4-2501 Hojin, Minato-ku•Treatment Area:
Parts of Nakagawa-ku and Minato-ku•Treatment System:
Standard Activated Sludge Process•Treatment Capacity:
150,000 m3/ day•Sewerage System:
Combined System•Effluent Stream:
Shonai River•Year of Start of Operation: 1975

•Location:•Treatment Area:• Treatment Area:• Treatment System:• Treatment Capacity:

Honjinyashiki, Iwatsuka-cho,Nakamura-ku
Parts of Kita-ku, Nishi-ku, andNakamura-ku
Standard Activated Sludge Process
200,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Shonai River• Year of Start of Operation: 1964

•Sewerage System:•Effluent Stream:Tempaku River•Year of Start of Operation: 1971

• Year of Start of Operation: 1964

Meijo Water Treatment Plant

Narumi Water Treatment Plant

Ueda Water Treatment Plant• Location:• Treatment Area:• Location:• Treatment Area:• Treatment System:• Treatment Capacity:•Location:•Treatment Area:• Treatment System:• Treatment Capacity:

1-3-3 Meijo, Kita-ku
Parts of Chikusa-ku, Higashi-ku,
Kita-ku, and Naka-ku
Standard Activated Sludge Process
100,000 m3/ day• Sewerage System:
Combined System• Effluent Stream:
Horikawa River• Year of Start of Operation: 196515

• Treatment System:• Treatment Capacity:• Sewerage System:• Effluent Stream:

2-35-36 Chitose, Atsuta-ku
Parts of Atsuta-ku, Nakagawa-ku, andMinato-ku
Standard Activated Sludge Process
100,000 m3/ day
Combined System
Horikawa River

60,000 m3/day
Combined System (Partially a Separate System)

5-59 Urasato, Midori-ku
Parts of Midori-ku, and Tempaku-ku
Standard Activated Sludge Process
150,000 m3/ day• Sewerage System:
Separate System• Effluent Stream:Tempaku River• Year of Start of Operation: 1969

•Treatment System:•Treatment Capacity:•Sewerage System:

Combined System (Partially a Separate System)•Effluent Stream:
Shonai River•Year of Start of Operation: 1975

•Treatment System:

3-1 Komegase-cho, Kita-ku
Parts of Moriyama-ku, Chikusa-ku, Kita-ku,
and Meito-ku
Standard Activated Sludge Process

Anaerobic Anoxic-Oxic Membrane Bioreactor
128,000 m3/ day
5,000 m3/ day•Sewerage System:
Separate System (Partially a Combined System)•Effluent Stream:
Shonai River•Year of Start of Operation: 1978
•Treatment Capacity:

1-512 Uedaminami, Tempaku-ku
Parts of Chikusa-ku, Showa-ku, Midori-ku,
Meito-ku, and Tempaku-ku
Standard Activated Sludge Process
Carrier Feed Type Anaerobic Anoxic-Oxic
Process
90,000 m3/ day

30,000 m3/ day•Sewerage System:
Separate System•Effluent Stream:
Ueda River•Year of Start of Operation: 1982

* When high-efficacy anaerobic oxic treatment is used, treatment
capacities become 38,000 m3 / day and 255,000 m3 / day for the
Atsuta Water Treatment Plant and Uchide Water Treatment Plants,
respectively.

16

Sludge Treatment Plants
Nearly 23,000m3 of sludge are produced each day at water treatment plants. At sludge treatment plants, the[Nagoya City's Sewerage Treatment Areas]sludge is concentrated, dehydrated, and incinerated to reduce the total volume. Even after this processing, there
are almost four 10-ton truck truckloads of incinerated sludge ash generated, which is then effectively utilized as araw material in the production of cement and other materials.
LegendSewered Area
Treatment Area
Water Treatment Plant
Sludge Treatment Plant

HirataTreatment
District

Pipeline (for sludge)
Municipal Boundary(As of the end of FY2018)

ShonaiRiver

Shinkawa
River

Iwatsuka
Treatment
District
Iwatsuka
Yamazaki Sludge Treatment Plant

Shibata Sludge Treatment Plant

Location: 1-9-24 Chuji, Minami-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
160 tons/ day (two incinerators)◆ Year of Start of Operation: 1964

Location: 2-40 Motoshibata-nishimachi, Minami-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
150 tons/ day (one incinerators) 190 tons/ day(two incinerators)
◆

Hojin

Location: 1-5 Sorami-cho, Minato-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
200 tons/ day (two incinerators)
◆

Meijo

Meijo
Treatment
DistrictMoriyama
Treatment
DistrictYada River

Nikko River
Sorami

KanareRiver

Horidome
Treatment
District

Nishiyama
Treatment
District
Nishiyama

Tsuyuhashi
Treatment
District Horikawa
River Horidome

UchideTemma-cho
Tsuyuhashi
Treatment
Treatment
AtsutaDistrict
District
Treatment
UchideDistrict
Shinhorikawa
Nakagawa
AtsutaRiver
Canal Chitose
Arako
Treatment
River
District
Temma-cho Yamazaki
Treatment
Chitose
Hojin
District
Treatment
District

Year of Start of Operation: 1973

Sorami Sludge Recycling Plant

Moriyama

Yamazaki Yamazaki
River
ShibataTreatment
NagoyaDistrict
Port
Shibata

Ueda
River

Ueda
Treatment
District
Ueda

NarumiTreatment
District
NarumiOgi RiverTempaku River

Year of Start of Operation: 2013

What is Advanced Treatment
Advanced Treatment allows for greater removal of "nitrogen" and "phosphate" when compared to the treatment method currently being
used at many water treatment plants (standard activated sludge process). Advanced treatment can be split into two groups based upon thedesired effect: "maintaining the water quality of rivers and oceans" by removing nitrogen and phosphate, and "effective use of natural water
resources" by making use of water treated by advanced treatment in various applications.
Red tide still occurs in Ise Bay, the outlet for treated sewerage water, and reducing nitrogen and phosphate (the elements responsible for redtide) is essential. Advanced treatment is a promising solution that is readily being implemented to improve this, and it provides the additional
benefit of being an abundant source of treated water for a variety of uses as well.

17

18

Sludge Treatment Plants
Nearly 23,000m3 of sludge are produced each day at water treatment plants. At sludge treatment plants, the[Nagoya City's Sewerage Treatment Areas]sludge is concentrated, dehydrated, and incinerated to reduce the total volume. Even after this processing, there
are almost four 10-ton truck truckloads of incinerated sludge ash generated, which is then effectively utilized as araw material in the production of cement and other materials.
LegendSewered Area
Treatment Area
Water Treatment Plant
Sludge Treatment Plant

HirataTreatment
District

Pipeline (for sludge)
Municipal Boundary(As of the end of FY2018)

ShonaiRiver

Shinkawa
River

Iwatsuka
Treatment
District
Iwatsuka
Yamazaki Sludge Treatment Plant

Shibata Sludge Treatment Plant

Location: 1-9-24 Chuji, Minami-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
160 tons/ day (two incinerators)◆ Year of Start of Operation: 1964

Location: 2-40 Motoshibata-nishimachi, Minami-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
150 tons/ day (one incinerators) 190 tons/ day(two incinerators)
◆

Hojin

Location: 1-5 Sorami-cho, Minato-ku◆ Incineration Capacity:
Fluidized Bed Incinerator:
200 tons/ day (two incinerators)
◆

Meijo

Meijo
Treatment
DistrictMoriyama
Treatment
DistrictYada River

Nikko River
Sorami

KanareRiver

Horidome
Treatment
District

Nishiyama
Treatment
District
Nishiyama

Tsuyuhashi
Treatment
District Horikawa
River Horidome

UchideTemma-cho
Tsuyuhashi
Treatment
Treatment
AtsutaDistrict
District
Treatment
UchideDistrict
Shinhorikawa
Nakagawa
AtsutaRiver
Canal Chitose
Arako
Treatment
River
District
Temma-cho Yamazaki
Treatment
Chitose
Hojin
District
Treatment
District

Year of Start of Operation: 1973

Sorami Sludge Recycling Plant

Moriyama

Yamazaki Yamazaki
River
ShibataTreatment
NagoyaDistrict
Port
Shibata

Ueda
River

Ueda
Treatment
District
Ueda

NarumiTreatment
District
NarumiOgi RiverTempaku River

Year of Start of Operation: 2013

What is Advanced Treatment
Advanced Treatment allows for greater removal of "nitrogen" and "phosphate" when compared to the treatment method currently being
used at many water treatment plants (standard activated sludge process). Advanced treatment can be split into two groups based upon thedesired effect: "maintaining the water quality of rivers and oceans" by removing nitrogen and phosphate, and "effective use of natural water
resources" by making use of water treated by advanced treatment in various applications.
Red tide still occurs in Ise Bay, the outlet for treated sewerage water, and reducing nitrogen and phosphate (the elements responsible for redtide) is essential. Advanced treatment is a promising solution that is readily being implemented to improve this, and it provides the additional
benefit of being an abundant source of treated water for a variety of uses as well.

17

18

4

Heav y Rain Preparedness

The sewerage system is not only responsible for "Returning treated wastewater to the rivers and oceans" but plays

Heavy Rain Preparedness

a very important role in "Protecting the city from heavy rain and floods" as well. The Nagoya City Waterworks andSewerage pipes have been fitted to withstand heavy

Sewerage Bureau has taken Preparedness against heavy rain and flooding as per the flood control measures outlined

rainfalls (50mm/ hour) and protect against flooding. Afterin "The Nagoya City Comprehensive Drainage Plan". The plan aims to mitigate flood damage caused by rains of

the Torrential Rain Disaster in the Tokai Region in 2000,

63mm/ hour and inundation floor damage caused by the rain of about 100mm/ hour.

"The Emergency Rainwater Preparedness Initiative"

Nagoya City advances not only projects with facility preparedness but also comprehensive measures to promote

was taken to upgrade the rain-withstanding ability (to"self-help" combined with a "mutual-, public-help" initiatives.

60mm/ hour, in principle) of facilities in the area affectedby this disaster or areas where the city function centers(Nagoya Station, etc.) "The Nagoya City Comprehensive
Drainage Plan" was amended in 2019 to advance facility
ReservoirConservation

NaturalConservation

Flooding from the Torrential Rain Disaster in the Tokai Region

preparedness, as well as to promote "self-, mutual-, publichelp" initiatives for flood control measures and to reduce
flood damage.

Civilian Reservoir
Facilities

Sewerage System
Preparedness

Pumping
Facilities

Flooding from the Torrential Rain Disaster of Late August 2008

Rainwater
Reservoir

River
Preparedness

Rainfall: ~ 63mm/ hour
Mitigation of flood damage

Water stop

Stormwater
Infiltration Facility

Rainfall: 63 ~ about 100mm/ hour
Mitigation of inundation flood damage· Reinforcement of Rainwater Pumps
Preparation and maintenance of rivers are underway as
well as efficient and effective reinforcement of rainwaterdrainage pumps.
· Reinforcement of Rainwater reservoirs

Providing
Information

Construction of temporary rainwater reservoirs for whensewer drainage capacity has been exceeded.

Evacuation to the
Building's Top Floor· Reinforcement of Sewerage Pipes
Sewerage pipes in areas that have previously flooded
or are at risk for flooding are being updated accordingly.
Rainwater reservoirs and other existing flood control
facilities are being renovated and renewed to maximize
their effectiveness in addition to sewerage pipe structural
reinforcements.

Evacuation to the
Building's Upper Floors

Evacuation to an
Evacuation Site
Raised Floors/ Raising
the Ground Levels· Self-, and Mutual-Help Awareness Information

Illustration taken from "The Nagoya City Comprehensive Drainage Plan"

Rainfall: Greater than about 100mm/ hour
Protecting the Lives of Residents

19

Preparation of Nagoya Central Rainwater Reservoir

Residents are asked to make use of the "River Flooding
and Inland Flooding Hazard Map" and plan out evacuationroutes, perform simple rain-waterproofing and clean out
rainwater gutter inflow grates. Business owners andresidents are asked to cooperate as well with "Rainwater
Flood Control" by reducing the amount of rainwater thatflows into sewage pipes during heavy rains.

Making Use of the "River Flooding and Inland Flooding Hazard Map"

20

4Heav y Rain Preparedness

The sewerage system is not only responsible for "Returning treated wastewater to the rivers and oceans" but plays

Heavy Rain Preparedness

a very important role in "Protecting the city from heavy rain and floods" as well. The Nagoya City Waterworks andSewerage pipes have been fitted to withstand heavy

Sewerage Bureau has taken Preparedness against heavy rain and flooding as per the flood control measures outlined

rainfalls (50mm/ hour) and protect against flooding. Afterin "The Nagoya City Comprehensive Drainage Plan". The plan aims to mitigate flood damage caused by rains of

the Torrential Rain Disaster in the Tokai Region in 2000,

63mm/ hour and inundation floor damage caused by the rain of about 100mm/ hour.

"The Emergency Rainwater Preparedness Initiative"

Nagoya City advances not only projects with facility preparedness but also comprehensive measures to promote

was taken to upgrade the rain-withstanding ability (to"self-help" combined with a "mutual-, public-help" initiatives.

60mm/ hour, in principle) of facilities in the area affectedby this disaster or areas where the city function centers(Nagoya Station, etc.) "The Nagoya City Comprehensive
Drainage Plan" was amended in 2019 to advance facility
ReservoirConservation

NaturalConservation

Flooding from the Torrential Rain Disaster in the Tokai Region

preparedness, as well as to promote "self-, mutual-, publichelp" initiatives for flood control measures and to reduce
flood damage.

Civilian Reservoir
Facilities

Sewerage System
Preparedness

Pumping
Facilities

Flooding from the Torrential Rain Disaster of Late August 2008

Rainwater
Reservoir

River
Preparedness

Rainfall: ~ 63mm/ hour
Mitigation of flood damage

Water stop

Stormwater
Infiltration Facility

Rainfall: 63 ~ about 100mm/ hour
Mitigation of inundation flood damage· Reinforcement of Rainwater Pumps
Preparation and maintenance of rivers are underway as
well as efficient and effective reinforcement of rainwaterdrainage pumps.
· Reinforcement of Rainwater reservoirs

Providing
Information

Construction of temporary rainwater reservoirs for whensewer drainage capacity has been exceeded.

Evacuation to the
Building's Top Floor· Reinforcement of Sewerage Pipes
Sewerage pipes in areas that have previously flooded
or are at risk for flooding are being updated accordingly.
Rainwater reservoirs and other existing flood control
facilities are being renovated and renewed to maximize
their effectiveness in addition to sewerage pipe structural
reinforcements.

Evacuation to the
Building's Upper Floors

Evacuation to an
Evacuation Site
Raised Floors/ Raising
the Ground Levels· Self-, and Mutual-Help Awareness Information

Illustration taken from "The Nagoya City Comprehensive Drainage Plan"

Rainfall: Greater than about 100mm/ hour
Protecting the Lives of Residents

19

Preparation of Nagoya Central Rainwater Reservoir

Residents are asked to make use of the "River Flooding
and Inland Flooding Hazard Map" and plan out evacuationroutes, perform simple rain-waterproofing and clean out
rainwater gutter inflow grates. Business owners andresidents are asked to cooperate as well with "Rainwater
Flood Control" by reducing the amount of rainwater thatflows into sewage pipes during heavy rains.

Making Use of the "River Flooding and Inland Flooding Hazard Map"20

5

E a r t h q u a ke P r e p a r e d n e s s

It is feared that a Nankai Trough Giant Earthquake would cause severe damage to the water supply and sewerage

Earthquake Preparedness (Disaster Preparedness Measures)

systems in Nagoya.

Nagoya City Waterworks and Sewerage Bureau strengthes the water supply and sewerage infrastructures inEarthquake-resistant measures are being taken to ensure that the water supply and sewerage lifelines remain

preparation for earthquakes, as well as informing the public regarding cooperative initiatives for self-, and mutual-functional for residents even during times of emergency.

help.

Earthquake Resistance of Facilities
Installations of emergency generators and improvement of earthquake resistance[Normal Times]

are being implemented at water purification plants and distribution stations, aswell as water treatment plants and pumping facilities, to safeguard the water andsewerage infrastructure in emergencies.
We are advancing to upgrade pipelines and sewerage lines with stronger

Renovation of Distribution Reservoirs

earthquake resistance pipes.

Self-, and Mutual-Help Awareness Information· Searching for Useful Facilities During Emergencies
Information regarding Emergency Water Supply Facilities/ Underground Type
Hydrants and other places useful during an emergency is searchable on the
Emergency Water Supply
Center Preparation

Bureau's official website. We encourage citizens to print out these facility
location/information sheets, so they are easily accessible during an emergency.
· Stockpiling of Drinking Water
We encourage families to stockpile at three days' worth of drinking water (9Earthquake-resistantof sewage Pipes

liters) per family member (each person uses 3 liters of water/day, so 9 liters per

Earthquake-resistant of
Water Distribution Pipes

person). Information about the sale of the "Emergency Drinking Water Meisui" is"Emergency Drinking Water Meisui"available as well.
[During an Emergency]· Practicing the use of Underground Type Hydrants, etc.
Emergency preparedness drills, including practicing the use of Underground Type
Hydrants by members of the community, is another activity we are involved in.
Portable Toilet (Directly
connected to Sewerage Line)

Emergency Water
Supply Facility

Underground
Type Hydrant

Stronger Collaborative Efforts with other Cities and Civilian Organizations.
We have Mutual Support Agreements with other cities and regularly conduct training and drills to ensure that in
the event of an emergency, water and sewerage service restoration can occur as quickly as possible.
Water Supply Truck21

We collaborate with civilian organizations to provide emergency water and supplies as well.

22

5

E a r t h q u a ke P r e p a r e d n e s s

It is feared that a Nankai Trough Giant Earthquake would cause severe damage to the water supply and sewerage

Earthquake Preparedness (Disaster Preparedness Measures)

systems in Nagoya.

Nagoya City Waterworks and Sewerage Bureau strengthes the water supply and sewerage infrastructures inEarthquake-resistant measures are being taken to ensure that the water supply and sewerage lifelines remain

preparation for earthquakes, as well as informing the public regarding cooperative initiatives for self-, and mutual-functional for residents even during times of emergency.

help.

Earthquake Resistance of Facilities
Installations of emergency generators and improvement of earthquake resistance[Normal Times]

are being implemented at water purification plants and distribution stations, aswell as water treatment plants and pumping facilities, to safeguard the water andsewerage infrastructure in emergencies.
We are advancing to upgrade pipelines and sewerage lines with stronger

Renovation of Distribution Reservoirs

earthquake resistance pipes.

Self-, and Mutual-Help Awareness Information· Searching for Useful Facilities During Emergencies
Information regarding Emergency Water Supply Facilities/ Underground Type
Hydrants and other places useful during an emergency is searchable on the
Emergency Water Supply
Center Preparation

Bureau's official website. We encourage citizens to print out these facility
location/information sheets, so they are easily accessible during an emergency.
· Stockpiling of Drinking Water
We encourage families to stockpile at three days' worth of drinking water (9Earthquake-resistantof sewage Pipes

liters) per family member (each person uses 3 liters of water/day, so 9 liters per

Earthquake-resistant of
Water Distribution Pipes

person). Information about the sale of the "Emergency Drinking Water Meisui" is"Emergency Drinking Water Meisui"available as well.
[During an Emergency]· Practicing the use of Underground Type Hydrants, etc.
Emergency preparedness drills, including practicing the use of Underground Type
Hydrants by members of the community, is another activity we are involved in.
Portable Toilet (Directly
connected to Sewerage Line)

Emergency Water
Supply Facility

Underground
Type Hydrant

Stronger Collaborative Efforts with other Cities and Civilian Organizations.
We have Mutual Support Agreements with other cities and regularly conduct training and drills to ensure that in
the event of an emergency, water and sewerage service restoration can occur as quickly as possible.
Water Supply Truck21

We collaborate with civilian organizations to provide emergency water and supplies as well.

22

6
In the Event of an Emergency (What to Do)
In the event that water service stops due to an earthquake, drinking water is available at an Emergency Water
Supply Facility. Underground Type Hydrants and portable toilets (which connect directly to sewer lines) are available
for residents to deploy and use as well.
Repairs to damaged water pipes and sewage pipes will be made as needed to restore service as quickly as
possible.

Public Relations Activities

Nagoya city Waterworks and Sewerage Bureau actively seeks to educate people about how water supply andsewerage systems work.

Public Tours of the Facilities
Tours of operational water purification and water treatment plants are available (reservations required).

Emergency Water Supply Facility
Water is available at wide-area and designated evacuation areas. Water supply
activates are initiated at Emergency Water Supply Facilities and overseen by

A field trip learn about waterworks and sewerage

cooperative assistance organization personnel and bureau personnel. Including
Emergency Water Supply Centers, there are 208 locations in the water service area.

As our future leaders, 4th-grade municipal elementary school students participate in this program to help the
younger generation gain an understanding and appreciation for water supply and sewerage systems.
Operational Status

Lectures and experiments help students learn about how rainwater from mountains becomes drinking water andhow used water is purified and returned to rivers.

Emergency Water Supply CenterWith earthquake-resistant reservoirs, emergency supply storehouses, permanent
hydrants (for use in emergencies), and water supply truck filling hydrants all
contained in one location, Emergency Water Supply Centers are designed tofunction primary hubs for supplying water during emergencies. There are 4 locationsin the water service area.

Hiranishi Emergency Water
Supply Center
A Lecture

Filtration Experiment

Paper-dissolution Experiment

Underground Type Hydrant
Underground Type Hydrants allow residents to access drinking water directly
themselves during an emergency, and are available at all municipal elementary andjunior high schools. Operational units are kept in those schools.

Special Events
Events are held at waterworks and sewerage facilities as well to educate as many people as possible about watersupply and sewerage systems.
Operational Status

Water Supply Truck
Water will be carried to medical/welfare facilities and designated evacuation shelters.

Water Supply Truck

International Cooperation

As part of a plan to assist developing nations in dealing with water supply andPortable Toilet (Directly connected to Sewerage Line)sewerage problems, Japanese waterworks and sewerage bureaus play an importantrole, and Nagoya City Waterworks & Sewerage Bureau dispatches waterworks andsewerage personnel to foreign countries as well as takes on research staff members

Portable toilets (which connect directly to sewage pipes via manholes) are available
at designated evacuation shelters for residents to deploy and use as well.

Portable Toilet (Directly
connected to Sewerage Line)

23

7

from abroad, as part of a collaboration with the Japan International Cooperation
Agency (JICA) that started in 1978. Nagoya City Waterworks and Sewerage Bureau
also assists business and organizations throughout the Chubu region in developing

Taking on Research Staff from Abroadinternational water-related businesses which revitalize local industries.
24

6
In the Event of an Emergency (What to Do)
In the event that water service stops due to an earthquake, drinking water is available at an Emergency Water
Supply Facility. Underground Type Hydrants and portable toilets (which connect directly to sewer lines) are available
for residents to deploy and use as well.
Repairs to damaged water pipes and sewage pipes will be made as needed to restore service as quickly as
possible.

Public Relations Activities

Nagoya city Waterworks and Sewerage Bureau actively seeks to educate people about how water supply andsewerage systems work.

Public Tours of the Facilities
Tours of operational water purification and water treatment plants are available (reservations required).

Emergency Water Supply Facility
Water is available at wide-area and designated evacuation areas. Water supply
activates are initiated at Emergency Water Supply Facilities and overseen by

A field trip learn about waterworks and sewerage

cooperative assistance organization personnel and bureau personnel. Including
Emergency Water Supply Centers, there are 208 locations in the water service area.

As our future leaders, 4th-grade municipal elementary school students participate in this program to help the
younger generation gain an understanding and appreciation for water supply and sewerage systems.
Operational Status

Lectures and experiments help students learn about how rainwater from mountains becomes drinking water andhow used water is purified and returned to rivers.

Emergency Water Supply CenterWith earthquake-resistant reservoirs, emergency supply storehouses, permanent
hydrants (for use in emergencies), and water supply truck filling hydrants all
contained in one location, Emergency Water Supply Centers are designed tofunction primary hubs for supplying water during emergencies. There are 4 locationsin the water service area.

Hiranishi Emergency Water
Supply Center
A Lecture

Filtration Experiment

Paper-dissolution Experiment

Underground Type Hydrant
Underground Type Hydrants allow residents to access drinking water directly
themselves during an emergency, and are available at all municipal elementary andjunior high schools. Operational units are kept in those schools.

Special Events
Events are held at waterworks and sewerage facilities as well to educate as many people as possible about watersupply and sewerage systems.
Operational Status

Water Supply Truck
Water will be carried to medical/welfare facilities and designated evacuation shelters.

Water Supply Truck

International Cooperation

As part of a plan to assist developing nations in dealing with water supply andPortable Toilet (Directly connected to Sewerage Line)sewerage problems, Japanese waterworks and sewerage bureaus play an importantrole, and Nagoya City Waterworks & Sewerage Bureau dispatches waterworks andsewerage personnel to foreign countries as well as takes on research staff members

Portable toilets (which connect directly to sewage pipes via manholes) are available
at designated evacuation shelters for residents to deploy and use as well.

Portable Toilet (Directly
connected to Sewerage Line)

23

7

from abroad, as part of a collaboration with the Japan International Cooperation
Agency (JICA) that started in 1978. Nagoya City Waterworks and Sewerage Bureau
also assists business and organizations throughout the Chubu region in developing

Taking on Research Staff from Abroadinternational water-related businesses which revitalize local industries.
24

H i s t o r y o f N a g o y a's Wa t e r S u p p l y
and Sewerage Systems

8

History of the Waterworks

History of the Sewerage Systems❬❬Meiji Era❭❭❬❬Meiji Era❭❭

October
October

1889
1893

November

1899

August

1902

June

1906

February

1908

Nagoya was established as a municipality.
Nagoya commissioned Englishman, W.K. Burton (Ministry of the Interior Affairs Health Bureau) to conduct a survey on
the construction of water supply and sewerage systems.
Nagoya commissioned Toshiro Ueda (an engineer from Aichi Prefecture and later Nagoya City Chief Waterworks
Engineers) to conduct a survey for the establishment of "The Emergency Sewerage Plan".
Nagoya commissioned Toshiro Ueda to conduct a survey for the establishment of"The Waterworks Plan".
Nagoya City Council decided to commence the construction of water supply andsewerage systems.
The construction of water supply and sewerage systems was authorized.
Toshiro Ueda
W.K. Burton❬❬Taisho Era❭❭
March
April
September
April

1914
1914
1914
1920

Main foundation work completed.
The Nagoya City Tap Water Supply Ordinance and the Out-of-City Water Ordinance were established.
Water supply from the Nabeyaueno Water Purification Plant began.
A water rate metering system was introduced to the entire city.

❬❬Showa Era❭❭
March
February
April
March
June
April
July
NovemberMay
August

1930
1934
1936
1946
1957
1969
1975
1976
1984
1984

The construction of the Higashiyama Water Distribution Tower was completed.
Out-of-city (former Nishibiwajima-cho) water supply began.
Water Supply Bureau established.
Water supply from the Oharu Water Purification Plant began.
The Water Supply Act was established.
Water supply from the Kasugai Water Purification Plant began.
Higashiyama Water Distribution
A record quantity of 1,235,140 m3 of water was supplied in one day.
Tower at the Time of Completion
The construction of the Iwaya Dam (first water source for Nagoya) was completed.
The manufacture of caned water "Nagoya-no-mizu" began.
"Nagoya-no-mizu" won second prize in a national water tasting competition (sponsored by the former Ministry of Welfare).

❬❬Heisei Era❭❭
AugustMarch
August
April
April
April

1990
1995
1996
2000
2003
2004

July
December
March
June

2006
2006
2008
2009

October
2010
September 2014
September 2014

The construction of the Nakagawanishi Emergency Water Supply Center*1 was completed.
The construction of the Nagaragawa Estuary Barrage was completed.
The construction of the Misogawa Dam was completed.
The Nagoya City Waterworks & Sewerage Bureau began operation.
The installation of underground type hydrants*2 in municipal elementary schools began.
The Hiranishi Emergency Water Supply Center*1 began operation. There are four of thesecenters operating within the city in the northern, southern, eastern, and western areas.
The manufacture and sale of the "Emergency Drinking Water Meisui" (canned water) began.
Customer call center opened ("Meisui Dial").
Tokuyama Dam is completed.
"The Study Group to Promote Nagoya to be the City with the Most Delicious Drinking Water inJapan" was formed.
"The River Basin Municipality Declaration" *3 was issued.
Nagoya celebrated 100 years since the beginning of its water supply service.
The Historical Museum of Waterworks and Sewerage opened.
"Emergency Drinking Water
Meisui"*1 A facility designed to serve as a base for emergency water supply activities in case of a disaster.
*2 Equipment local residents can operate themselves to obtain drinking water. In 2006, Nagoya completed the installation of Underground Type Hydrants
in all municipal elementary schools, and in 2016 completed the installation in all municipal junior high schools.
*3 A Declaration stating the intention of the municipalities located in the catchment basins of the Kiso Three Rivers, which had an opportunity to meet atthe 10th Conference of the Parties (COP10) for the Convention on Biological Diversity. They agreed to work together to promote collaborative efforts toprotect forests, rivers, and oceans, and all water environments and ecosystems.

25

October
October

1889
1893

November

1899

August
June

1902
1906

February

1908

Nagoya was established as a municipality.
Nagoya commissioned Englishman, W.K. Burton (Ministry of the Interior Affairs Health Bureau) to conduct a survey on
the construction of water supply and sewerage systems.
Nagoya commissioned Toshiro Ueda (an engineer from Aichi Prefecture and later Nagoya City Chief Waterworks
Engineers) to conduct a survey for the establishment of "The Emergency Sewerage Plan".
Nagoya commissioned Toshiro Ueda to conduct a survey for the establishment of "The Waterworks Plan".
Nagoya City Council decided to commence the construction of water supply
and sewerage systems.
The construction of water supply and sewerage systems was authorized.

❬❬Taisho Era❭❭
November
March

1912
1923

The start of Nagoya's first sewerage service was announced.
The foundation work was completed. (Laying of sewage pipes: approx. 340km.
The construction of the Atsuta Pumping Station was completed.)

Completed Horidome Water
Treatment Plant❬❬Showa Era❭❭
October

1930

March
December
October
April
April

1932
1932
1941
1958
1964

April
October
May

1971
1978
1987

❬❬Heisei Era❭❭
July
September
April
December

The Horidome and Atsuta Sewage Treatment Plants*4 began operation (First sewage
treatment by activated sludge process in Japan).
The Tempaku Sludge Treatment Plant*5 began operation (solar evaporation treatment).
The Ordinance Concerning the Building of Flush Toilets was established.
The Nagoya City Sewerage Works Ordinance was established (completely revised in 1947).
The Sewerage Act was established.
The Yamazaki Sludge Treatment Plant began operation (machine-assisted dehydration
treatment).
The Sewerage Bureau was organized separately from the Waterworks Bureau.
The Hisaya Rainwater Reservoir*6 began operation.
The Takatsuji Rainwater Reservoir for Pollution Control*6 began operation.
Constructions of main lines
during the early Showa Era

1989
1996
2000
2000

The Sewerage Science Museum opened.
The Narumi Soil Improvement Center began operation.
The Nagoya City Waterworks & Sewerage Bureau began operation.
The Emergency Rainwater Drainage Basic Plan was formulated in response to the Torrential Rain Disaster in the TokaiRegion.
April
2001 The Atsuta Water Treatment Plant introduced a high-efficacy treatment process (AO process for phosphate removal).
July
2001 The Hojin Recycling Center began operation.
December 2006 Customer call center opened ("Meisui Dial").
January
2009 The Secondary Emergency Rainwater Drainage Plan was formulated in response to the torrential rain that occurred at
the end of August 2008.
February
2010 The Shibata Water Treatment Plant introduced a high-efficacy treatment process (A2O process for removing nitrogenand phosphate).
October2010 "The River Basin Municipality Declaration"*3 was issued.
November 2012 Nagoya celebrated the 100th anniversary of the start of its sewerage service.
November 2012 "The History of Sewerage Works: Memorial Zone" opened.
October
2013 The Sorami Sludge Recycling Center began operation.
September 2014 The Historical Museum of Waterworks and Sewerage opened.
September 2017 The Tsuyuhashi Water Treatment Plant began operation (using the A2O process for removing nitrogen and phosphate).

*4 The sewage treatment plants were renamed water treatment plants in 2008. There are fifteen water treatment plants in operation (as of the end of
FY2018).
*5 The Tempaku Sludge Treatment Plant has since discontinued operation. There are three sludge treatment plants in operation (as of the end of
FY2018).
*6 A rainwater reservoir is a facility for temporarily storing rainwater to protect cities from heavy rains. Rainwater reservoir for pollution control is a facility
for temporarily storing relatively dirty rainwater that falls at the beginning of a storm. There are 102 rainwater reservoirs and rainwater reservoirs forpollution control in operation (as of the end of FY2018).

26

H i s t o r y o f N a g o y a's Wa t e r S u p p l y
and Sewerage Systems

8

History of the Waterworks

History of the Sewerage Systems❬❬Meiji Era❭❭❬❬Meiji Era❭❭

October
October

1889
1893

November

1899

August

1902

June

1906

February

1908

Nagoya was established as a municipality.
Nagoya commissioned Englishman, W.K. Burton (Ministry of the Interior Affairs Health Bureau) to conduct a survey on
the construction of water supply and sewerage systems.
Nagoya commissioned Toshiro Ueda (an engineer from Aichi Prefecture and later Nagoya City Chief Waterworks
Engineers) to conduct a survey for the establishment of "The Emergency Sewerage Plan".
Nagoya commissioned Toshiro Ueda to conduct a survey for the establishment of"The Waterworks Plan".
Nagoya City Council decided to commence the construction of water supply andsewerage systems.
The construction of water supply and sewerage systems was authorized.
Toshiro Ueda
W.K. Burton❬❬Taisho Era❭❭
March
April
September
April

1914
1914
1914
1920

Main foundation work completed.
The Nagoya City Tap Water Supply Ordinance and the Out-of-City Water Ordinance were established.
Water supply from the Nabeyaueno Water Purification Plant began.
A water rate metering system was introduced to the entire city.

❬❬Showa Era❭❭
March
February
April
March
June
April
July
NovemberMay
August

1930
1934
1936
1946
1957
1969
1975
1976
1984
1984

The construction of the Higashiyama Water Distribution Tower was completed.
Out-of-city (former Nishibiwajima-cho) water supply began.
Water Supply Bureau established.
Water supply from the Oharu Water Purification Plant began.
The Water Supply Act was established.
Water supply from the Kasugai Water Purification Plant began.
Higashiyama Water Distribution
A record quantity of 1,235,140 m3 of water was supplied in one day.
Tower at the Time of Completion
The construction of the Iwaya Dam (first water source for Nagoya) was completed.
The manufacture of caned water "Nagoya-no-mizu" began.
"Nagoya-no-mizu" won second prize in a national water tasting competition (sponsored by the former Ministry of Welfare).

❬❬Heisei Era❭❭
AugustMarch
August
April
April
April

1990
1995
1996
2000
2003
2004

July
December
March
June

2006
2006
2008
2009

October
2010
September 2014
September 2014

The construction of the Nakagawanishi Emergency Water Supply Center*1 was completed.
The construction of the Nagaragawa Estuary Barrage was completed.
The construction of the Misogawa Dam was completed.
The Nagoya City Waterworks & Sewerage Bureau began operation.
The installation of underground type hydrants*2 in municipal elementary schools began.
The Hiranishi Emergency Water Supply Center*1 began operation. There are four of thesecenters operating within the city in the northern, southern, eastern, and western areas.
The manufacture and sale of the "Emergency Drinking Water Meisui" (canned water) began.
Customer call center opened ("Meisui Dial").
Tokuyama Dam is completed.
"The Study Group to Promote Nagoya to be the City with the Most Delicious Drinking Water inJapan" was formed.
"The River Basin Municipality Declaration" *3 was issued.
Nagoya celebrated 100 years since the beginning of its water supply service.
The Historical Museum of Waterworks and Sewerage opened.
"Emergency Drinking Water
Meisui"*1 A facility designed to serve as a base for emergency water supply activities in case of a disaster.
*2 Equipment local residents can operate themselves to obtain drinking water. In 2006, Nagoya completed the installation of Underground Type Hydrants
in all municipal elementary schools, and in 2016 completed the installation in all municipal junior high schools.
*3 A Declaration stating the intention of the municipalities located in the catchment basins of the Kiso Three Rivers, which had an opportunity to meet atthe 10th Conference of the Parties (COP10) for the Convention on Biological Diversity. They agreed to work together to promote collaborative efforts toprotect forests, rivers, and oceans, and all water environments and ecosystems.

25

October
October

1889
1893

November

1899

August
June

1902
1906

February

1908

Nagoya was established as a municipality.
Nagoya commissioned Englishman, W.K. Burton (Ministry of the Interior Affairs Health Bureau) to conduct a survey on
the construction of water supply and sewerage systems.
Nagoya commissioned Toshiro Ueda (an engineer from Aichi Prefecture and later Nagoya City Chief Waterworks
Engineers) to conduct a survey for the establishment of "The Emergency Sewerage Plan".
Nagoya commissioned Toshiro Ueda to conduct a survey for the establishment of "The Waterworks Plan".
Nagoya City Council decided to commence the construction of water supply
and sewerage systems.
The construction of water supply and sewerage systems was authorized.

❬❬Taisho Era❭❭
November
March

1912
1923

The start of Nagoya's first sewerage service was announced.
The foundation work was completed. (Laying of sewage pipes: approx. 340km.
The construction of the Atsuta Pumping Station was completed.)

Completed Horidome Water
Treatment Plant❬❬Showa Era❭❭
October

1930

March
December
October
April
April

1932
1932
1941
1958
1964

April
October
May

1971
1978
1987

❬❬Heisei Era❭❭
July
September
April
December

The Horidome and Atsuta Sewage Treatment Plants*4 began operation (First sewage
treatment by activated sludge process in Japan).
The Tempaku Sludge Treatment Plant*5 began operation (solar evaporation treatment).
The Ordinance Concerning the Building of Flush Toilets was established.
The Nagoya City Sewerage Works Ordinance was established (completely revised in 1947).
The Sewerage Act was established.
The Yamazaki Sludge Treatment Plant began operation (machine-assisted dehydration
treatment).
The Sewerage Bureau was organized separately from the Waterworks Bureau.
The Hisaya Rainwater Reservoir*6 began operation.
The Takatsuji Rainwater Reservoir for Pollution Control*6 began operation.
Constructions of main lines
during the early Showa Era

1989
1996
2000
2000

The Sewerage Science Museum opened.
The Narumi Soil Improvement Center began operation.
The Nagoya City Waterworks & Sewerage Bureau began operation.
The Emergency Rainwater Drainage Basic Plan was formulated in response to the Torrential Rain Disaster in the TokaiRegion.
April
2001 The Atsuta Water Treatment Plant introduced a high-efficacy treatment process (AO process for phosphate removal).
July
2001 The Hojin Recycling Center began operation.
December 2006 Customer call center opened ("Meisui Dial").
January
2009 The Secondary Emergency Rainwater Drainage Plan was formulated in response to the torrential rain that occurred at
the end of August 2008.
February
2010 The Shibata Water Treatment Plant introduced a high-efficacy treatment process (A2O process for removing nitrogenand phosphate).
October2010 "The River Basin Municipality Declaration"*3 was issued.
November 2012 Nagoya celebrated the 100th anniversary of the start of its sewerage service.
November 2012 "The History of Sewerage Works: Memorial Zone" opened.
October
2013 The Sorami Sludge Recycling Center began operation.
September 2014 The Historical Museum of Waterworks and Sewerage opened.
September 2017 The Tsuyuhashi Water Treatment Plant began operation (using the A2O process for removing nitrogen and phosphate).

*4 The sewage treatment plants were renamed water treatment plants in 2008. There are fifteen water treatment plants in operation (as of the end of
FY2018).
*5 The Tempaku Sludge Treatment Plant has since discontinued operation. There are three sludge treatment plants in operation (as of the end of
FY2018).
*6 A rainwater reservoir is a facility for temporarily storing rainwater to protect cities from heavy rains. Rainwater reservoir for pollution control is a facility
for temporarily storing relatively dirty rainwater that falls at the beginning of a storm. There are 102 rainwater reservoirs and rainwater reservoirs forpollution control in operation (as of the end of FY2018).

26

PR Facilities and Information

METAWATER Sewerage Science Museum Nagoya
The museum offers a fun, hands-on way to learn about the unseen world of sewerage systems and how theywork.
Weekend workshops, festivals, and other events are held at the Sewerage Science Museum. Original manhole
covers from 24 different cities in Japan are on display outdoors as well.
Location: 1-3-3 Meijo, Kita-ku (1st Floor of Meijo Water Treatment Plant)
Access: 5 minutes' walk from "Meijo Line" subway station "Meijo Koen"
To Kurokawa

5 minutes' walk from the city bus stops "Johoku-bashi" or"Meijo Koen"

City Bus Stop "Johoku-bashi"

For Inquiries: TEL · FAX 052-911-2301

Johoku Bridge*Please use public transportation.

METAWATER
Sewerage Science
Museum Nagoya
Otsu DoriCity Bus Stop "Meijo Koen"

M08
Subway Station"Meijo Koen"

Meijo Park S.
Nagoya Castle

To City Hall

Historical Museum of Waterworks and Sewerage
The goal of the Historical Museum of Waterworks and Sewerage is to educate people about water supply andsewerage systems and preparedness measures in an easy-to-understand way. The Historical Museum holds
seasonal events and the staff conducts informative tours.
Location: 1-1-44 Tsukigaoka, Chikusa-ku
Access: 17 minutes' walk from "Higashiyama Line" subway

station "Kakuozan"

To Nagoya Dome mae Yada

TEL 052-723-3311

Subway Station"Sunada-bashi"

To Chayagasaka

Nagoya Dome

2 minutes' walk from the city bus stop "Tsukigaoka"
For Inquiries:

M14

Nabeyaueno Water Purification Plant
City Bus Stop "Taniguchi"

Taniguchi

Dekimachi DoriFAX 052-723-3312*Parking is limited, so please use public transportation.

City Bus Stop "Temma-dori 2 chome"

Historical Museumof Waterworks
and Sewerage
City Bus Stop "Tsukigaoka"

Nittaiji Temple

Suemori-dori 2
To Ikeshita

H15

Subway Line
"Kakuozan"

Printed by: Nagoya City Waterworks & Sewerage Bureau Public Relations & Customer Service Division(TEL 052-972-3608 FAX 052-972-3710)

Hirokoji DoriTo "Motoyama"

March 2020 2,000 copies