Table 3.

Toxic and essential trace element concentrations (μg/L).

Elements	5th Percentile	25th Percentile	Median	75th Percentile	95th Percentile
Toxic Elements
As	22.5	43.1	73.2	122.7	263.1
Cd	0.71	1.20	1.79	2.60	5.24
Pb	1.29	2.12	3.09	4.93	10.14
Trace Elements
Se	17.9	27.2	36.5	52.3	90.1
Zn	126	250	371	524	981
Cu	4.6	7.9	11.0	16.1	37.4