Table 8 Suitability of water based on HPI and HEI and their percent sharing in the study area (N = 72).

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

Pollution indices

Classification

Suitability of water

Category-wise contribution of samples

Percentage

Source of reference

HPI

 < 25

Excellent

70

97

40

26–50

Good

2

3

51–75

Poor

Nil

N.A

76–100

Very poor

Nil

N.A

 > 100

Unsuitable

Nil

N.A

HEI

 < 10

Low

72

100

39,44

10–20

Medium

Nil

N.A

 > 20

High

Nil

N.A

  1. N.A. not applicable.
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