Table 2 Classification of heavy metals pollution based on calculated HPI40.

From: A systematic study on occurrence, risk estimation and health implications of heavy metals in potable water from different sources of Garhwal Himalaya, India

S.N.

HPI specification

Class of heavy metals pollution

1

 < 25

Excellent

2

26–50

Good

3

51–75

Poor

4

76–100

Very poor

5

 > 100

Unsuitable for consumption

Back to article page