Water Quality Standards
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S.No
ParametersWATER QUALITY USPHS
STANDARDS BIS ICMR
WHO
1
pH value
7-8.5
6.5-8.5
6.5-9.2
6.5-9.2
2
DO (mg/l)
-
6
-
-
3
BOD (5day20oC,mg/l)
-
2
-
-
4
MPN/100 ml, max
-
50
-
-
5
Color, Hazen units
5
10
25 on pt-co scale
50 on ptco scale
6
Odour
Nil
Nil
-
-
7
Taste
Tasteless
Tasteless
Tasteless
Tasteless
8
TDS (mg/l)
500
500
-
-
9
Total hardness (mg/l)
200
300
-
-
10
Calcium hardness(mg/l)
75
200
200
200
11
Magnesium hardness(mg/l)
30
100
150
150
12
Copper as Cu (mg/l)
0.05
1.5
3.0
1.5
13
Iron as Fe (mg/l)
0.1
0.3
1.0
1.0
14
Manganese as Mn(mg/l)
0.05
0.5
0.5
0.5
15
Chlorides as Cl2(mg/l)
200
250
-
-
16
Sulphates as So4(mg/l)
200
400
-
400
17
Nitrates as No3 (mg/l)
45
20
50
5-100
18
Fluorides, (mg/l)
1.0
1.5
2.0
1-1.5
ParametersWATER QUALITY USPHS
STANDARDS BIS ICMR
WHO
1
pH value
7-8.5
6.5-8.5
6.5-9.2
6.5-9.2
2
DO (mg/l)
-
6
-
-
3
BOD (5day20oC,mg/l)
-
2
-
-
4
MPN/100 ml, max
-
50
-
-
5
Color, Hazen units
5
10
25 on pt-co scale
50 on ptco scale
6
Odour
Nil
Nil
-
-
7
Taste
Tasteless
Tasteless
Tasteless
Tasteless
8
TDS (mg/l)
500
500
-
-
9
Total hardness (mg/l)
200
300
-
-
10
Calcium hardness(mg/l)
75
200
200
200
11
Magnesium hardness(mg/l)
30
100
150
150
12
Copper as Cu (mg/l)
0.05
1.5
3.0
1.5
13
Iron as Fe (mg/l)
0.1
0.3
1.0
1.0
14
Manganese as Mn(mg/l)
0.05
0.5
0.5
0.5
15
Chlorides as Cl2(mg/l)
200
250
-
-
16
Sulphates as So4(mg/l)
200
400
-
400
17
Nitrates as No3 (mg/l)
45
20
50
5-100
18
Fluorides, (mg/l)
1.0
1.5
2.0
1-1.5
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