Heavy metals Drinking water (mg/L) Drinking water (mg/L) Drinking water (mg/L) Drinking water (mg/L)
WHO
CPCB
ICMR
BIS 10500- 2012
As 0.05 NR 0.05 0.01
Cd 0.005 NR 0.01 0.003
Pb 0.05 NR 0.05 0.01
Ni Data Not available Data Not available Data Not available 0.02
Hg 0.001 NR 0.001 0.001
Zn 5.0 15.0 0.1 5
Cr 0.1 NR - 0.05
Cu 1.0 1.5 1.5 0.05