Parameter

Symbol

Benchmark

Sulphate

Hardness

Nitrate

Coliform

Manganese

Chromium

Zinc

Arsenic

Selenium

Chloride

Phenolics

TDS

Iron

Copper

Lead

Cadmium

Mercury

SO₄

CaCO₃

NO₃

-

Mn

Cr

Zn

As

Se

Cl

-

-

Fe

Cu

Pb

Cd

Hg

250 mg/l

500 mg/l

10 mg/l

Must not be detected in any 100 ml sample

0.1 mg/l

0.05 mg/l

3 mg/l

0.01 mg/l

0.01 mg/l

250 mg/l

0.002 mg/l

1000 mg/l

0.3 mg/l

1.0 mg/l

0.01 mg/l

0.003 mg/l

0.001 mg/l