Analysis of Physiochemical Parameters to Evaluate the Drinking Water Quality in the State of Perak, Malaysia

Table 2

The safe limits of WHO and NDWQS for determining drinking water quality.

Parameter	WHO limits	NDWQS limits
pH	6.5–8.5	6.5–9
Conductivity (S/cm)	—	1000
Turbidity (NTU)	5	—
TSS (mg/L)	—	25
TDS (mg/L)	1000	1000
Cu (mg/L)	2	1
Zn (mg/L)	None	3
Mg (mg/L)	None	150
Fe (mg/L)	0.3	0.3
Cd (mg/L)	0.003	0.003
Cr (mg/L)	0.05	0.05
Pb (mg/L)	0.01	0.01
As (mg/L)	0.01	0.01
Hg (mg/L)	0.006	0.001
Sn (mg/L)	—	—