EC of water in dS/m (=mS/cm)

Classification

USDA (1954)

FAO (1976)

FAO (1992)

Non-saline

<0.25

<0.75

<0.7

Slightly saline

0.7 - 2.0

Moderately saline

0.25 - 0.75

0.75 - 3.0

2 - 10

Highly saline

0.75 - 2.25

>3.0

10 - 25

Very high saline

2.25 - 50

25 - 45

Sea water: >45 dS/m