Parameter

Permissible

Moderately safe

Moderately unsafe

Unsafe

pH

6.5 - 8.0

-

-

>8

EC (ds/m)

<0.7

0.7 - 3.0

-

>3.0

RSC (meq/L)

<1

-

1.25 - 2.5

>2.5

SAR

<3

3 - 9

-

>9

Boron (mg/L)

<2.0

2.0 - 2.5

2.5-3.0

>3.0

Chloride (meq/L)

<4

4-10

-

>10

BOD (mg/L)

≤100

-

-

>100

Bicarbonate (meq/L)

<1.5

1.5-8.5

-

>8.5