Table 3 Classification of Heavy metals pollution based on calculated HEI39,44.

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.

HEI specification

Class of heavy metals pollution

1

Below 10

Low

2

Between 10 and 20

Medium

3

Above 20

High

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