Water Quality, Surface Water Standards (TCVN 5942, 1995)

Water Quality, Surface Water Standards (TCVN 5942, 1995)

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WATER QUALITY: SURFACE WATER QUALITY STANDARD TCVN 5942-1995

1. Scope

1.1 This standard specifies parameter limits and maximum allowable concentrations of pollutants in surface water.

1.2 This standard is applicable to control of quality of a surface water source.

2. Limitation Value

2.1 Parameter limits and maximum allowable concentration of pollutants in surface water are specified in the table 1.

2.2 Standard methods of analysis of parameters and pollutant concentrations of surface water are specified in available current TCVNs.

Table 1 Parameter Limits and Maximum Allowable Concentration of Pollutants in Surface Water

Nº	Parameter and Substance	Unit	Limitation Value
Nº	Parameter and Substance	Unit	A	B
1	pH value	--	6 - 8,5	5,5 - 9
2	BOD₅ (20ºC)	mg/l	<4	<25
3	COD	mg/l	<10	<35
4	Dissolved oxygen	mg/l	³ 6	³ 2
5	Suspended solids	mg/l	20	80
6	Arsen	mg/l	0,05	0,1
7	Barium	mg/l	1	4
8	Cadimium	mg/l	0,01	0,02
9	Lead	mg/l	0,05	0,1
10	Chromium, Hexavalent	mg/l	0,05	0,05
11	Chromium, Trivalent	mg/l	0,1	1
12	Copper	mg/l	0,1	1
13	Zinc	mg/l	1	2
14	Manganese	mg/l	0,1	0,8
15	Nickel	mg/l	0,1	1
16	Iron	mg/l	1	2
17	Mercury	mg/l	0,001	0,002
18	Tin	mg/l	1	2
19	Ammonia (as N)	mg/l	0,05	1
20	Fluoride	mg/l	1	1,5
21	Nitrate (as N)	mg/l	10	15
22	Nitrite (as N)	mg/l	0,01	0,05
23	Cyanide	mg/l	0,01	0,05
24	Phenol compounds	mg/l	0,001	0,02
25	Oil and grease	mg/l	not detectable	0,3
26	Detergent	mg/l	0,5	0,5
27	Coliform	MPN/100 ml	5000	10000
28	Total pesticides (except DDT)	mg/l	0,15	0,15
29	DDT	mg/l	0,01	0,01
30	Gross alpha activity	Bq/l	0,1	0,1
31	Gross beta activity	Bq/l	1,0	1,0

Note

Values in the column A are applied to the surface water using for source of domestic water supply with appropriate treatments.
Values in the column B are applied to the surface water using for the purposes other than domestic water supply. Quality criteria of water for aquatic life are specified in a separate standard.

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Acknowledgement: Text courtesy of NEA Policy Division, MOSTE.

Disclaimer: APCEL has tried to ensure the accuracy, reliability and completeness of the information in this database; however, APCEL does not guarantee the accuracy, reliability or completeness of this information. If you encounter an error, please notify us by e-mail at lawapcel@nus.edu.sg.

last updated 1st August 1998
Asia-Pacific Centre for Environmental Law
Faculty of Law
National University of Singapore
© 1998