EPA Interim Primary Drinking Water Standards

Parameter Maximum level (mg/l) Arsenic 0.05 Barium 1.0 Cadmium 0.01 Chromium 0.05 Fluoride 1.4-2.4 Lead 0.05 Mercury 0.002 Nitrate (as N) 10 Selenium 0.01 Silver 0.05 Endrin 0.0002 Lindane 0.004 Methoxychlor 0.1 Toxaphene 0.005 2,4-D 0.1 2,4,5-TP Silver 0.01 Radium 5 pCi/1 Gross Alpha 15 pCi/1 Gross Beta 4 millirem/yr Turbidity 1/TU Coliform Bacteria 1/100 ml [ Comment: Turbidity is applicable only to surface water supplies.]