Parameters

WHO Standard (2011)

(acceptability and health-based of drinking-water guideline values)

Weight (w_i)

Relative weight (W_i)

pH

4

0.08

EC

4

0.08

Salinity

4

0.08

${\text{NO}}_3^{-}$

50 mg·L⁻¹

5

0.1

${\text{NO}}_2^{-}$

3 mg·L⁻¹

5

0.1

${\text{NH}}_4^{+}$

0.2 mg·L⁻¹

5

0.1

${\text{SO}}_4^{2-}$

250 mg·L⁻¹

2

0.04

${\text{PO}}_4^{3-}$

5

0.1

Na⁺

200 mg·L⁻¹

2

0.04

K⁺

4

0.08

Ca²⁺

100 mg·L⁻¹

2

0.04

Mg²⁺

50 mg·L⁻¹

2

0.04

${\text{HCO}}_3^{-}$

2

0.04

Cl⁻

250 mg·L⁻¹

4

0.08

${\displaystyle \sum w_i}=50$

${\displaystyle \sum W_i}=1$