WATER QUALITY PARAMETERS AND DRINKING WATER STANDARDS

Sl. No.

Parameters

Units

Drinking Water

IS: 10500 - 1991

Desirable

Maximum

1.

Colour

Hazen units

5

25

2.

Odour

-

Unobjectionable

-

3.

Taste

-

Agreeable

-

4.

Turbidity

NTU

5

10

5.

pH value

-

6.5 to 8.5

No relaxation

6.

Total hardness (as CaCO3)

mg/l

300

600

7.

Iron

mg/l

0.3

1.0

8.

Chlorides

mg/l

250

1000

9.

Residual, free Chlorine

mg/l

0.2

-

10.

Dissolved Solids

mg/l

500

2000

11.

Calcium

mg/l

75

200

12.

Copper

mg/l

0.05

1.5

13.

Manganese

mg/l

0.1

0.3

14.

Sulphate

mg/l

200

400

15.

Nitrate

mg/l

50

No relaxation

16.

Fluoride

mg/l

1.0

1.5

17.

Phenolic compounds

mg/l

0.001

0.002

18.

Mercury

mg/l

0.001

No relaxation

19.

Cadmium

mg/l

0.01

No relaxation

20.

Selenium

mg/l

0.01

No relaxation

21.

Arsenic

mg/l

0.05

No relaxation

22.

Cyanide

mg/l

0.05

No relaxation

23.

Lead

mg/l

0.05

No relaxation

24.

Zinc

mg/l

5

15

25.

Anionic detergents

mg/l

0.2

1.0

26.

Chromium

mg/l

0.05

No relaxation

27.

Polynuclear aromatic Hydrocarbons

mg/l

-

-

28.

Mineral oil

mg/l

0.01

0.03

29.

Pesticides

mg/l

Absent

0.001

30.

Radioactive materials            (a)     Alpha emitters (b)     Beta emitters

 

Bq/l

Pci/l

 

-

-

 

0.1

0.037

31.

Alkalinity

mg/l

200

600

32.

Aluminlum

mg/l

0.03

0.2

33.

Boron

mg/l

1

5

 

 

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