Environmental Standards for Water Quality and Aquatic Ecosystem<Rivers and Streams>-Standard for Human Health Protection (River, Streams and Lakes)
Pollutants

Standard Value (㎎/L)

Cadmium (Cd)≤0.005

Arsenic (As)≤0.05

Cyanide (CN)Not Detected (Limit of Detection 0.01)

Mercury (Hg)

Not Detected (Limit of Detection 0 .001)

Organic Phosphorus

Not Detected (Limit of Detection 0.0005)

Polychlorinated Biphenyls (PCB)

Not Detected (Limit of Detection 0.0005)

Lead (Pb)≤0.05

Hexachromium (Cr6+)≤0.05

Alkyl Benzene Sulfate (ABS)≤0.5

Carbon Tetrachloride (CCI4)≤0.004

1,2-Dichloroethylene≤0.03

Tetrachloroethylene (PCE)≤0.04

Dichloromethane≤0.02

Benzene≤0.01

Chloroform≤0.08

Di-Ethylhexyl Phthalate (DEHP)≤0.008Antimony (Sb)

≤0.02

-Standard for the Living Environment

Standard
Coliforms (No./100 ㎖)

GradepH

BOD

SS

DO

(mg/L)(mg/L)(mg/L)

TotalFecal

Coliforms

Coliforms

Very Good

Ia

6.5∼8.5

≤1

≤25

≥7.5

≤50

≤10GoodIb

6.5∼8.5

≤2

≤25

≥5.0

≤500

≤100

Fairly GoodII

6.5∼8.5

≤3

≤25

≥5.0

≤1,000≤200

FairIII

6.5∼8.5

≤5≤25

≥5.0

≤5,000≤1,000Fairly PoorIV

6.0∼8.5≤8≤100≥2.0--≥2.0--＜2.0--

No floatingPoor

V

6.0∼8.5≤10matters such asgarbage

Very Poor

VI-＞10-Remarks
1. Water Quality by Grade & State of Aquatic Ecosystems
a. Very Good : Higher concentrations of DO (Dissolved Oxygen), no pollutant, excellent condition of ecosystems, and residential use after a simple
purification process (e.g., filtration and sterilization)b. Good : High DO levels, few pollutants, good condition of ecosystems, and residential use after a general purification process (e.g., sedimentation,filtration, and sterilization)c. Fairly Good : Good DO levels, a few pollutants, good and moderate condition of ecosystems, and residential/ swimming pool use after ageneralpurification process (e.g., sedimentation, filtration, and sterilization)d. Fair : Moderate concentrations of DO, general pollutants, moderate condition of ecosystems, residential use after an advanced purification process(e.g., sedimentation, filtration, carbon block filtration, and sterilization) and industrial use after a general purification process
e. Fairly Poor : Low concentrations of DO, many pollutants, an agricultural use, and an industrial purpose after an advanced purification process
f. Poor : Lower concentrations of DO, a significant amount of pollutants, an industrial use after an advanced purification process (e.g., sedimentation,filtration, carbon block filtration, sterilization, and reverse osmosis), and no effect of bad or unpleasant odor on daily lifeg. Very Poor : Little DO, polluted water, and few fish to surviveh. A certain grade of water can be used for lower-grade water purpose.
i. An appropriate water treatment in line with the status of pollution by item (e.g., pH) and the method of water treatment, allows lower-grade water tobe used for higher-grade water purpose.

Water Quality by Grade & Biological Features of Aquatic Ecosystem

Biological Indicator Species

GradeBenthos

Habitats & Features
Fish

Gammarus, Korean Fresh

Trout, Moroco SP, Fresh- Crystal clear water, and high flow velocity

Water Crayfish, Drunella

Water Salmon,- Rocks and pebbles at the bottom

Aculea, CincticostellaChinese- Very little attached algae

Levanidovae, Plecoptera,

Minnow, etc.

Very Good∼Good

Rhyacophila,
Glossosoma KUa,
Hydatophylax

Good∼Fair

Melanian snail, Glossiphonia,

Shiri, Dark C- Clear water, and normally high or moderate flow

Rhoenanthus (Potamanthindus),

Sweetfish, Mandarin

velocity

Ephemera Orientalis,Fish, etc.

- Rock and gravel at the bottom- A bit attached algae

Uracanthella Rufa, Caenis
Rishinoae, Psephenoides
sp. 1, Macronema Radiatum
McLachlan

Fair~Fairly Poor

Lymnaeidae, Arhynchobdellidae,

Dace fish, Korean- Low water turbidity, and normally low flow

Water boatman ,Orthetrum

Piscivorous Chub,velocity

Albistylum Specisum,

False [Goby] Minnow,- Small gravel and sand at the bottom

Stone Moroko,etc.

Physa Acuta, Tubifex, Red Sea

Crucian [Prussian] Carp,- High water turbidity and low flow velocity

Bass, Mothfly, Hover fly

Carp, Loach,- Sand and silt at the bottom; and the color of water is

Catfish, etc.

black.

Fairly Poor∼
Very Poor- Much attached green algae- Much attached brown/gray algae

<Lakes>-Standard for Human Health ProtectionThis standard is the same as that of rivers and streams for human health protection-Standard for the Living Environment
Standard
E-Coliforms
Grade

COD

SS

DO

T-P

T-N

Chl-a

(㎎/L)

(㎎/L)

(㎎/L)

(㎎/L)

(㎎/L)

(㎎/㎥)

pH

Very
Good

Good

FairlyGood
Fair
FairlyPoor(No./100mL)
TotalFecal

Ia

6.5∼8.5

≤2

≤1

≥7.5

≤0.01

≤0.2

≤5

≤50

≤10Ib

6.5∼8.5

≤3

≤5

≥5.0

≤0.02

≤0.3

≤9

≤500

≤100II

6.5∼8.5

≤4

≤5

≥ 5.0

≤0.03

≤0.4

≤14

≤1,000≤200

III

6.5∼8.5≤5≤15≥5.0≤0.05

≤0.6

≤20

≤5,000≤1,000IV

6.0∼8.5

≤8≤15

≥2.0

≤0.10

≤1.0

≤35-

-

V

6.0∼8.5

≤10

≥2.0

≤0.15

≤1.5

≤70-

-

＜2.0＞0.15＞1.5＞70--

No floating
Poorgarbage
Very
Poor

VI

-

＞10-

Remarks
1. When the ration of total nitrogen to total phosphorate is less than 7, the criteria of total phosphorate shall not be applied, and on the other hand, theratio is more than 16, the criteria of total nitrogen shall not be applied.
2. Water quality by grade and the status of aquatic ecosystems is the same as the first column of A. Rivers and Streams, (2) the Standard for the Living
Environment.
3. Design of characters is the same as the first column of A. Rivers and Streams, (2) the Standard for the Living Environment.