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In India, the Central Pollution Control Board (CPCB) has developed a concept of designated best use.

Designated Best Use

Class

Criteria

Drinking Water Source without conventional treatment but after disinfection

A

1.Total Coliforms Organism MPN/100ml shall be 50 or less

2. pH between 6.5 and 8.5

3. Dissolved Oxygen 6mg/l or more

4. Biochemical Oxygen Demand 5 days 20 C, 2mg/l or less

Outdoor bathing (Organised)

B

1.Total Coliforms Organism MPN/100ml shall be 500 or less

2. pH between 6.5 and 8.5

3. Dissolved Oxygen 5mg/l or more

4. Biochemical Oxygen Demand 5 days 20 C, 3mg/l or less

Drinking water source after conventional treatment and disinfection

C

1. Total Coliforms Organism MPN/100ml shall be 5000 or less

2. pH between 6 and 9

3. Dissolved Oxygen 4mg/l or more

4. Biochemical Oxygen Demand 5 days 20 C, 3mg/l or less

Propagation of Wild life and Fisheries

D

1. pH between 6.5 and 8.5

2. Dissolved Oxygen 4mg/l or more

3. Free Ammonia (as N)

4. Biochemical Oxygen Demand 5 days 20 C, 2mg/l or less

Irrigation, Industrial Cooling, Controlled Waste disposal

E

1. pH between 6.0 and 8.5

2. Electrical Conductivity at 25 C micro mhos/cm, maximum 2250

3. Sodium absorption Ratio Max. 26

4. Boron Max. 2mg/l

Below-E

Not meeting any of the A, B, C, D & E criteria

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