Water quality criteria

WATER QUALITY CRITERIA
Water class	Criteria
A	Drinking water without treatment: Faecal coliforms: 50 MPN / 100 ml (max); DO: 5 mg/1 (min); BOD: 2mg/l (max)
B	Bathing: Faecal coliforms: 500 MPN / 100 ml (max);DO: 5 mg /l (max)
C	Drinking water with treatment: Faecal coliforms: 5000 MPN / 100 ml (max) DO: 4 mg/l (min); BOD: 3 mg/l (max)
D	Wildlife, fisheries: DO: 4mg/l (min)
Source: Central Pollution Control Board

HARDWAR	KANPUR	ALLAHABAD
Dissolved Oxygen (mg/l) D/S 8.1 6.9 7.6	Dissolved Oxygen (mg/l) U/S 7.2 N.A. 5.1 D/S 6.7 4.4 5.1	Dissolved Oxygen (mg/l) U/S 6.4 8 7.07 D/S 6.6 6.9 6.4
Biological Oxygen Demand (mg/l) D/S 1.80 1.77 2.01	Biological Oxygen Demand (mg/l) U/S 7.17 N.A. 1.61 D/S 8.57 43.45 65.84	Biological Oxygen Demand (mg/l) U/S 7.2 N.A. 5.1 D/S 6.7 4.4 5.1
Faecal Coliforms (MPN/100) D/S 477 518 490	Faecal Coliforms (MPN/100) U/S 161643 N.A. N.A D/S 144333 19500 N.A.	Faecal Coliforms (MPN/100) U/S 350 2011 N.A D/S 743 367 N.A.
VARANASI	PATNA	DEFINITIONS
Dissolved Oxygen (mg/l) U/S 5.6 7.8 7.7 D/S 5.9 7.2 6.8	Dissolved Oxygen (mg/l) U/S 8.4 7.7 8.2 D/S 8.1 7.5 7.4	BOD(BIOLOGICAL OXYGEN DEMAND):A measure of the amount of oxygen consumed by micro-organisms that feed on organic matter in water. Higher BOD means more contaminated water. DO(DISSOLVED OXYGEN): A measure of the oxygen dissolved in water. Higher DO means cleaner water. FAECAL COLIFORM: Organisms found in the intestinal tracts of people and animals. Their presence in water indicates dangerous bacterial contamination.
Biological Oxygen Demand (mg/l) U/S 10.13 2.62 1.16 D/S 10.60 5.94 1.89	Biological Oxygen Demand (mg/l) U/S 1.95 0.30 1.39 D/S 2.20 0.33 0.85
Faecal Coliforms (MPN/100) U/S 387 4017 N.A. D/S 793 988667 N.A.	Faecal Coliforms (MPN/100) U/S 161643 N.A. N.A D/S 144333 19500 N.A.	1986 1990 1991 U/S Upstream D/SDownstream MPN/100 Most Probable Number/100

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