% Na

Quality of water

Samples

<20%

Excellent

12 (CTd, IT1a, IT1b, IT1c, IT1d, IT2a,

IT2c, IT2d, IT3a, IT3b, IT3c and IT3d)

20% - 40%

Good

3 (CTc, IT2b, SWa)

40% - 60%

Permissible

None

60% - 80%

Doubtful

1 (CTb)

80%

Unsuitable

3 (CTa, SWb, SWc)