Changes in Rates of Compliance with Environmental Quality Standards (BOD or COD)

Source: Results of the FY 2001 Nationwide Water Quality Survey of Public Water Areas, Ministry of the Environment

Changes in the Water Quality of Three Sea Areas

Source: Complied from Results of FY 1995–2001 Nationwide Water Quality Survey of Public Water Areas, Ministry of the Environment

Bay, 56% for Ise Bay, 74% for the Seto Inland Sea and 45.8% for lakes and reservoirs. In order to meet water quality objectives, the total pollutant load control programmes for Tokyo Bay, Ise Bay and Seto Inland Sea have set targets for the total daily COD load permissible from all point sources (with FY 2004 set as the target year). These programmes include nitrogen and phosphorus from 2001, as one of the measures against eutrophication in enclosed water body.

The results of the FY 2001 Water Quality Survey of Groundwater reported that 7.2% of the total wells surveyed had substances that exceeded their environmental quality standards. Nitrate nitrogen/nitrite nitrogen was found in levels exceeding the environmental quality standard in 5.8% of the wells. Immediate measures are needed to deal with this pollution.

Results of Groundwater Quality Survey for FY 2001 (General Survey)

Substance	Number of wells surveyed	Number of wells exceeding EQSs	Excess rate (%)	EQS
Cadmium	3,003	0	0	0.01 mg/L or less
Total cyanide	2,660	0	0	Not detected
Lead	3,362	13	0.4	0.01 mg/L or less
Chromium (VI)	3,175	0	0	0.05 mg/L or less
Arsenic	3,422	44	1.3	0.01 mg/L or less
Total mercury	2,907	3	0.1	0.0005 mg/L or less
Alkyl mercury	1,075	0	0	Not detected
PCBs	2,044	0	0	Not detected
Dichloromethane	3,548	1	0.0	0.02 mg/L or less
Carbon tetrachloride	3,700	0	0	0.002 mg/L or less
1,2-dichloroethane	3,316	0	0	0.004 mg/L or less
1,1-dichloroethylene	3,668	0	0	0.02 mg/L or less
cis-1,2-dichloroethylene	3,673	5	0.1	0.04 mg/L or less
1,1,1-trichloroethane	4,290	0	0	1 mg/L or less
1,1,2-trichloroethane	3,308	0	0	0.006 mg/L or less
Trichloroethylene	4,371	11	0.3	0.03 mg/L or less
Tetrachloroethylene	4,374	10	0.2	0.01 mg/L or less
1,3-dichloropropene	2,898	0	0	0.002 mg/L or less
Thiuram	2,506	0	0	0.006 mg/L or less
Simazine	2,638	0	0	0.003 mg/L or less
Thiobencarb	2,575	0	0	0.02 mg/L or less
Benzene	3,324	0	0	0.01 mg/L or less
Selenium	2,600	0	0	0.01 mg/L or less
Nitrate nitrogen/nitrite nitrogen	4,017	231	5.8	10 mg/L or less
Fluorine	3,558	25	0.7	0.8 mg/L or less
Boron	3,408	14	0.4	1.0 mg/L or less
Total (actual number of wells)	4,722	341	7.2

Source: Results of the FY 2001 Nationwide Water Quality Survey of Groundwater, Ministry of the Environment

Changes in Occurrences of Marine Pollution by Sea Area

Year	Type of pollutant	Sea area	Coast of Hokkaido	East coast of Honshu	Tokyo Bay	Ise Bay	Osaka Bay	Seto Inland Sea excluding Osaka Bay	Southern coast of Honshu	Coast of Kyushu	Coast of Japan Sea	Southwestern sea area	Total
1998	Oil	Hazardous liquid substances	0	7	1	0	1	2	33	0	0	2	46
Other	Wastes	8	6	2	13	37	60	33	39	13	0	211
Subtotal	2	0	9	1	1	11	11	1	1	0	0	26
Red tide	10	13	12	14	39	73	67	40	13	2	283
Total	0	1	2	6	1	8	5	0	3	0	26
1999	Oil	Hazardous liquid substances	0	2	2	0	0	1	13	2	0	0	20
Other	Wastes	13	3	4	20	9	49	40	18	21	4	181
Other	1	3	6	0	5	5	5	1	0	2	0	23
Subtotal	14	8	12	20	14	55	54	20	23	4	224
Red tide	0	2	10	3	3	2	2	0	4	0	26
Total	32	43	86	34	31	104	87	57	62	53	589
2000	Oil	Hazardous liquid substances	0	1	0	1	1	1	25	0	1	0	30
Other	Wastes	10	9	2	45	3	43	10	39	64	1	226
Other	1	1	4	0	1	3	5	1	0	0	16
Subtotal	11	11	6	46	5	47	40	40	65	1	272
Red tide	0	0	15	5	1	1	6	2	1	0	31
Total	24	34	99	68	22	92	91	73	79	28	610
2001	Oil	Hazardous liquid substances	0	1	73	28	11	49	31	45	38	18	327
Other	Wastes	1	3	3	6	5	32	13	8	31	1	103
Other	1	1	8	0	0	0	1	0	0	0	11
Subtotal	2	6	12	7	7	33	14	9	31	1	122
Red tide	0	0	16	4	0	3	4	6	4	0	37
Total	17	25	101	39	18	85	49	60	73	19	486
2002	Oil	Hazardous liquid substances	0	29	68	21	16	63	14	45	42	28	358
Other	Wastes	2	7	2	2	2	12	9	10	33	0	79
Other	1	1	9	1	0	7	1	2	1	0	23
Subtotal	3	8	11	3	4	20	14	13	34	0	110
Red tide	0	3	4	14	0	10	8	5	4	0	48
Total	35	40	83	38	20	93	36	63	80	28	516

1. "Hazardous liquid substances" in "Other than oil" refer to hazardous liquids designated by the Law Relating to the Prevention of Marine Pollution and Maritime Disaster or liquids that have not been assessed.

2. "Other" in "Other than oil" includes industrial effluent, blue tides, etc.

Source: Japan Coast Guard

## (2) Marine Pollution

There were 516 occurrences of marine pollution incidents in sea areas surrounding Japan in FY 2002, an increase of 30 occurrences as compared to FY 2001.