INLAND SURFACE WATER CATEGORIES

The Central Pollution Control Board has classified the inland Surface water into five categories A to E. On the basis of there designated best use and the desired class. The principal concern has been the end use to which man may put to water. The classification has been made in such a manner that with the degradation in quality, the water quality requirement becomes progressively lower from A to E. The CPCB classification of the inland surface water is give as under: -

Designated Best Use

Class of Water

Criteria

Drinking water Source without Conventional treatment but after disinfections.

A

1.    Total coliform organisms MPN/100 ml shall be 50(max.) 

2.   pH between 6.5 to 8.5

3.    Dissolved Oxygen (Min) 6 mg/l

4.    BOD (max) 5 days < 2.00 mg/l

Outdoor bathing(Organised)

B

1.    Total coliform organisms MPN/100 ml shall be 500 (max.)

2.    Fecal Coliform MPN/100 mg. to be 2500 (max.) for Ganga Action Plan.

3.   pH between 6.8 to 8.5.

4.    Dissolved Oxygen (min) 4 mg/l

5.    BOD (Max.) 5 days @ 3 mg/l

Drinking water with conventional treatment Followed by disinfections

C

1.    Total coliform organisms MPN/100 ml shall be 5000 (max.)

2.    pH between 6.8 to

3.    Dissolved Oxygen (min) 4 mg/l

4.    BOD (max.) 5 days @ 3 mg/l

Propagation of wild life Fisheries.

D

1.    pH between 6.5 to 8.5

2.    Dissolved Oxygen (min) 4 mg/l.

3.    Free Ammonia (as N) (max)1.2mg/l.

Designated Best use

Class of Water

Criteria