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SOCIAL SERVICE Table 4.9
Drinking water standards

Prescribed by

BIS (IS 10500-91) ICMR

Sl. Parameters Max. permissible Max. per-
No. Limits in the ab- missible
Desirable sence of alternate Desirable
Limit Limit limits
source

12 34 5 6
1 PH 7.0 – 8.5 6.5 – 9.2
2 Total dissolved solids mg/L 6.5 to8.5 No relaxation 1500-3000
3 Total hardness as CaCO3 500
500 2000 300 600
mg/L
4 Calcium as Ca mg/L 300 600
5 Magnesium as Mg mg/L
6 Chloride as Cl mg/L 75 200 75 200
7 Sulphate as SO4 mg/L 30 100 50 -
8 Nitrate as NO3 mg/L 250 1000 200 1000
9 Iron as Fe mg/L 200 400 200 400
10 Fluoride as F mg/L 45 100 20 100
11 Arsenic as As mg/L 0.3 0.1 1
12 Manganese as Mn mg/L 1
13 Zinc as Zn mg/L 1 1.5 1 1.5
14 Copper as Cu mg/L 0.05 0.05 - 0.05
15 Chromium as Cr mg/L 0.3 0.1 0.5
16 Lead as Pb mg/L 0.1 15 0.1 5
17 Mercury as Hg mg/L 5 1.5 0.05 1.5
18 Cadmium as Cd mg/L 0.05 --
19 Cyanide as CN mg/L 0.05 0.05 - 0.5
20 Minerals Oil mg/L 0.05 0.001 - 0.001
21 Phenolic compounds mg/L 0.05 0.01 - 0.01
22 Total Coliform MPN/100 ml 0.001 0.05 - 0.05
23 Residual free chlorine 0.01 0.03 --
0.05 0.002 --
mg/L 0.01 10 --
24 Aluminium as A1 mg/L 0.001 --
25 Boron as B mg/L -
26 Selenium as Se mg/L 1
27 Pesticides 0.2

0.03 0.2
1 5
-
0.01
Absent 0.001

Source:Central Ground Water Board

Note – Indian Standard, Drinking Water Specification (Second Revision) BIS (IS 10500:2012)
has also been recently published by the Bureau Of Indian Standards.

Kerala State Planning Board