Table 4.

Quality of ground water sample samples from rural area in Sarpol-e Zahab city for drinking purpose (BIS standard) [2].

Parameter	Desirable limit	2015 Year samples (%)		2016 Year samples (%)
		Within limits	Exceed limits	Within limits	Exceed limits
pH	6.5–8.5	100	0	100	0
EC	300 (μmhos/cm)	0	100	0	100
TDS	500 (mg/L)	93.3	6.7	90	10
Total hardness	200 (mg/L)	13.4	86.6	20	80
SO4	200 (mg/L)	100	0	100	0
Cl	250 (mg/L)	100	0	100	0
Ca	75 (mg/L)	53.3	46.7	60	40
Mg	30 (mg/L)	93.3	6.7	90	10
Na	200 (mg/L)	100	0	100	0