National River Conservation Directorate
Ministry of Jal Shakti
Department of Water Resources, River Development & Ganga Rejuvenation
Government of India



Water quality criterion for various designated best uses specified by CPCB
Sl.No. Class Designated best use Water Quality Criteria
1. Class A Drinking water source without conventional treatment but after disinfection Dissolved Oxygen-6.0 mg/l or more Biochemical Oxygen Demand-2.0 mg/l or less, Total Coliform- 50 MPN/100 ml.
2. Class B Outdoor bathing Dissolved Oxygen-5 mg/l or more Biochemical Oxygen Demand-3 mg/l or less. Fecal Coliform- 500 MPN/100 ml (desirable), 2500 MPN/100 ml (maximum permissible).
3. Class C Drinking water source with conventional treatment followed by disinfection Dissolved Oxygen-4 mg/l or more Biochemical Oxygen Demand-3 mg/l or less, Total Coliform- 5000 MPN/100 ml.
4. Class D Propagation of wildlife and Fisheries Dissolved Oxygen-4 mg/l or more Free ammonia-1.2 mg/l.
5. Class E Irrigation, Industrial Cooling and Controlled Waste Disposal Electrical Conductivity- 2,250 mhos/cu. Sodium Absorption Ratio- 26 or less, Boron- 2 mg/l.