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BIS STANDARDS FOR DRINKING WARTER

Characteristic BIS Requirement Limit BIS Permissible Limit WHO Guidelines US EPA Limit
Essential Characteristics Colour (in Hazen units) 5 25 15 15
Odour Unobjectionable - - -
Taste Agreeable - - -
Turbidity (in NTU) 5 10 5 -
pH 6.5 -8.5 6.5 -8.5 - 6.5 -8.5
Total Hardness(as CaCO3) 300 600 - -
Iron (as Fe) 0.3 1.0 0.3 0.3
Chlorides (as Cl) 250 1000 250 250
Residual Free Chlorine 0.2 - - -
Desirable Characteristics
Dissolved Solids 500 2000 1000 500
Calcium 75 200 - -
Copper 0.05 1.5 2 1.3
Manganese 0.1 0.3 0.5 0.5
Sulphate 200 400 250 250
Nitrate 45 100 50 10
Fluoride 1.0 1.5 1.5 4
Phenolic Compounds 0.001 0.002 - -
Mercury 0.001 0.001 0.001 0.002
Cadmium 0.001 0.001 0.003 0.005
Selenium 0.001 0.001 0.001 0.005
Arsenic 0.005 0.005 0.001 -
Cyanide 0.005 0.005 0.007 0.2
Lead 0.005 0.005 0.001 Zero
Zinc 5 15 3 5
Anionic Detergents 0.2 1.0 - -
Chromium 0.05 0.05 0.05 0.1
Polynuclear Aromatic Hydrocarbons - - - -
Mineral Oil 0.01 0.03 - -
Pesticides Absent 0.001 - -
Alkalinity 200 600 - -
Aluminium 0.03 0.2 0.2 0.05-0.2
All units in mg/liters unless mentioned otherwise.
US EPA standards are Maximum Contaminant Level Goals (MCLG) and are non - enforceable public health goals.
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