Groundwater classification on the basis of total dissolved solids (TDS) and total hardness (TH).

S. no.	Class of groundwater	Range of TDS/TH (mg L−1)	Samples		Sample number
			No.	%
Total dissolved solids (Selvakumar et al. 38 )
1	Fresh water	<1000	4	14.28	15, 17, 25, 28
2	Slightly saline	1000–3000	21	75	1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 14, 16, 18, 19, 20, 21, 22, 23, 24, 26, 28
3	Moderately saline	3000–10 000	3	10.71	6, 10, 12
4	Very saline	10 000–30 000	Nil	Nil	Nil
5	Brine	>30 000	Nil	Nil	Nil
Total hardness (Sawyer and McCarty 39 )
1	Soft	<75	Nil	Nil	Nil
2	Moderately hard	75–150	Nil	Nil	Nil
3	Hard	150–300	Nil	Nil	Nil
4	Very hard	>300	28	100	All samples