Assessment of Selected Heavy Metals Concentration Level of Drinking Water in Gazer Town and Selected Kebele, South Ari District, Southern Ethiopia

Table 3

Drinking water contaminants and maximum admissible limit set by different national and international organizations (for health risk and aesthetic value) [3].

	Heavy metals (μg/L)
	As	Cd	Co	Cr	Cu	Fe	Mn	Ni	Pb	Zn
USEPA, 2008	10	5	100	100	1300	300	50	100	15	5000
EU, 1998	10	5	NM	50	2000	200	50	20	10	NM
WHO, 2008	10	3	NM	50	2000	NGL	400	70	10	NGL
Iranian, 1997	50	10	NM	50	1000	1000	500	NM	50	NM
Australi, 1996	7	2	NM	50^c	2000	300^c	500	20	10	3000^b
Indian, 2005	50	10	NM	50^c	1500	300	100	20	100	5000
New Zealand, 2008	10	4	1000	50	2000	200	400	80	10	1500

NM = not mentioned; NGL = no guideline, because it occurs in drinking water at concentrations well below those at which toxic effects may occur; no guideline, because it is not of health concern at concentrations normally observed in drinking water but may affect the acceptability of water at concentration above 300 μg/L, ^bbased on quality (aesthetic) not safety (health risk), ^cchromium as Cr⁺⁶ not total Cr.