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Water Quality Criteria

Characteristics

Designated best use

A

B

C

D

E

Dissolved Oxygen (DO)mg/l, min

6

5

4

4

-

Biochemical Oxygen demand (BOD)mg/l, max

2

3

3

-

-

Total coliform organisms MPN/100ml, max

50

500

5,000

-

-

pH value

6.5-8.5

6.5-8.5

6.0-9.0

6.5-8.5

6.0-8.5

Colour, Hazen units, max.

10

300

300

-

-

Odour

Un-objectionable

-

-

Taste

Tasteless

-

-

-

-

Total dissolved solids, mg/l, max.

500

-

1,500

-

2,100

Total hardness (as CaCO3), mg/l, max.

200

-

-

-

-

Calcium hardness (as CaCO3), mg/l, max.

200

-

-

-

-

Magnesium hardness (as CaCO3), mg/l, max.

200

-

-

-

-

Copper (as Cu), mg/l, max.

1.5

-

1.5

-

-

Iron (as Fe), mg/l, max.

0.3

-

0.5

-

-

Manganese (as Mn), mg/l, max.

0.5

-

-

-

-

Cholorides (as Cu), mg/l, max.

250

-

600

-

600

Sulphates (as SO4), mg/l, max.

400

-

400

-

1,000

Nitrates (as NO3), mg/l, max.

20

-

50

-

-

Fluorides (as F), mg/l, max.

1.5

1.5

1.5

-

-

Phenolic compounds (as C2H5OH), mg/l, max.

0.002

0.005

0.005

-

-

Mercury (as Hg), mg/l, max.

0.001

-

-

-

-

Cadmium (as Cd), mg/l, max.

0.01

-

0.01

-

-

Salenium (as Se), mg/l, max.

0.01

-

0.05

-

-

Arsenic (as As), mg/l, max.

0.05

0.2

0.2

-

-

Cyanide (as Pb), mg/l, max.

0.05

0.05

0.05

-

-

Lead (as Pb), mg/l, max.

0.1

-

0.1

-

-

Zinc (as Zn), mg/l, max.

15

-

15

-

-

Chromium (as Cr6+), mg/l, max.

0.05

-

0.05

-

-

Anionic detergents (as MBAS), mg/l, max.

0.2

1

1

-

-

Barium (as Ba), mg/l, max.

1

-

-

-

-

Free Ammonia (as N), mg/l, max

-

-

-

1.2

-

Electrical conductivity, micromhos/cm, max

-

-

-

-

2,250

Sodium absorption ratio, max

-

-

-

-

26

Boron, mg/l, max

-

-

-

-

2

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