Assessment of Groundwater Quality along the Cooum River, Chennai, Tamil Nadu, India

Table 4

Water quality parameters with respect to the WHO standards.

S. no	Parameter	WHO
1	pH	7.0–8.5
2	Electrical conductivity (EC) (μS/cm)	1400
3	Total dissolved solids (mg/L)	1000
4	Bio chemical oxygen demand (BOD) (mg/L)	5
5	Chemical oxygen demand (COD) (mg/L)	10
6	Sodium (mg/L)	200
7	Lead	0.01