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Write the standards for portable water.
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• The quantity of water used for drinking must be followed to achieve good health and to control various water bone and water induced diseases.

• There are various agencies who play and important role in specifying the norms to fix the water quality standard such as

a. Indian standard institution (I.S.I)

b. World health organization (W.H.O)

c. United states public health service (U.S.P.H.S)

d. Indian council of medicine research (I.C.M.R)

Sr. No Substance or characteristics Desirable Limit Permissible limit in the absence of alternate source
1 Colour 5 25
2 Odour Un-objectionable -
3 Taste Agreeable -
4 Turbidiy (NTU) 5 10
5 pH value 6.5 to 8.5 No re laxation
6 Total hardness (mg/l) 300 600
7 Iron (mg/l) 0.3 1.0
8 Chlorides (mg/l) 250 1000
9 Residula chlorine 0.2 -
10 Fluoride (mg/l) 1.0 1.5
11 Dissolved Solids 500 2000
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