Standards of water used for domestic purposes

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