Water Quality standards for best designated usages
Water Quality
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 |
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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 | - |