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    Water Quality - Water Quality standards for best designated usages

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Water Quality Standards for Best Designated Usages
Category of Fresh Water
A - I
A-II A-III A-IV
Best Usage
Unfiltered Public water
supply after approved
disinfection
Public water supply with
approved treatment equal
to coagulation, sedimen-
tation & disinfection.
Not fit for human
consumption, Fish &
Wildlife Propagation.
Fit for Agriculture,
Industrial cooling &
process water.
Total Ammonical Nitrogen 1.5 mg/l 1.5 mg/l - 50 mg/l
Chlorides (Cl) 600 mg/l 600 mg/l - 600 mg/l
Sulphates 400 mg/l 400 mg/l - 1000 mg/l
Copper (Cu) 1.5 mg/l 1.5 mg/l - -
Manganese (Mn) 0.5 mg/l 3.0 mg/l - -
Iron (Fe) 1.0 mg/l 5.0 mg/l - -
Sodium - - - -
Zinc (Zn) 15.0 mg/l 1.5 mg/l 5.0 mg/l 5.0 mg/l
Phenolic Compounds 0.002 mg/l 0.002 mg/l 0.05 mg/l -
Alkyl Benzene sulphates 1.0 mg/l 1.0 mg/l - -
Mineral Oil 0.3 mg/l 0.3 mg/l - -
Ammonia 1.5 mg/l 1.5 mg/l - -
B.O.D. (5 days 20 . C) 2.0 mg/l(Monthly average of atleast 10 samples) 5.0 mg/l(Monthly average of atleast 10 samples) 10 mg/l 30 mg/l
C.O.D. - - - 150 mg/l
D.O. Not less than 5 mg/l(Monthly average of 100 samples) 4.0 mg/l Not less than 3 mg/l Not less than 2 mg/l
Bacteriological Standards : Coliform Bact. 250 Not greater than 5000    
(MPN/100)        
 

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