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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.
Chemical Qualities : Maximum allowable concentration
Toxic Substances
Arsenic (As)
0.3 mg/l
0.3 mg/l
1.0 mg/l
0.1 mg/l
Cadmium (Cd)
0.01 mg/l
0.01 mg/l
-
-
Chromium ( Cr)
0.05 mg/l
0.05 mg/l
0.05 mg/l 0.2 mg/l
Cyanide (CN)
0.05 mg/l
0.1 mg/l 0.05 mg/l 0.2 mg/l
Lead (Pb)
0.1 mg/l
0.1 mg/l -
0.1 mg/l
Boron (B)
-
-
-
2.0 mg/l
Mercury (Hg)
0.001 mg/l
0.001 mg/l 0.001 mg/l
-
Gross alpha activity
3 PCI/l
10-9 uc/ml
3 PCI/l 3 PCI/l
Gross Beta activity
30 PCI/l
10-8 uc/m 30 PCI/l 30 PCI/l
Substances affecting health
Fluoride (F)
1.5 mg/l
1.5 mg/l
-
1.0 mg/l
Nitrates (NO3)
45 mg/l
45 mg/l
-
-
Substances affecting the potability of water
pH
6.5 to 8.5 6.0 to 8.5 6.5 to 9.0 6.5 to 9.0
T.D.S. - T.D.S. T.D.S. -.
Total Solids 1500 mg/l. 1500 mg/l. -. -
Total Suspended Solids 25 mg/l - - -
Total Hardness (Caco3) 50 mg/l - - -
Total Residual Chlorine - - - -
Electrical conduct at 25. C - - 1000 x 10-6 mhos 3000 x 10-6 mhos
Free Carbon Di Oxide - - 12 mg/l -
Free Ammonical Nitrogen - - 1.2 mg/l -
Oil & Grease - - 0.1 mg/l -
Pesticides - - 0.02 mg/l -
Biotic Index - - 6.0 mg/l -

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