The following are the standards of water to be used for domestic purposes.
Standards of water quality
The following are the standard of water to be used for domestic purposes:
Physical
Temperature – 100 to 15.60C
Odour – 0 to 4p value
Colour – 10 to 20 [platinum cobalt scale]
Turbidity – 5 to 10 p.p.m. [silica scale]
Taste – no objectionable taste
Chemical
Total solids – up to 500 p.p.m
Hardness – 75 p.p.m. to 115 p.p.m. [hardness expressed
Chlorides – as Ca CO3 equivalent]
Iron and manganese – up to 250 p.p.m.
Ph value – 6.5 to 8
Lead – 0.1 p.p.m.
Arsenic – 0.05 p.p.m.
Sulphate – upto 250 p.p.m.
Carbonate alkalinity – to 120 p.p.m.
Dissolve oxygen – 5 to 6 p.p.m.
B.O.D – Nil
Biological
B – Coli – No B- coli in 100ml
Most probable number – one number in 100ml
Radiological
∝ emitters – 1c \ litre
β emitters – 10c \ litre