Classification pattern

Ranges

Categories

Total Dissolved Solids

(TDS) [27]

<500

Desirable for drinking

500 - 1000

Permissible for Drinking

1000 - 3000

Useful for irrigation

>3000

Unfit for drinking and irrigation

Percent Sodium

(% Na) [28]

0 - 20

Excellent

20 - 40

Good

40 - 60

Permissible

60 - 80

Doubtful

>80

Unsuitable

Sodium Absorption Ratio

(SAR) [29]

0 - 10

Excellent

10 - 18

Good

18 - 26

Doubtful

>26

Unsuitable

Permeability Index

(PI) [30]

>75

Class-I

25 - 75

Class-II

Magnesium Hazard

(MH) [31]

>50%

Unsuitable

<50%

Suitable