Parameter Maximum Level (milligrams/liter) 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 Silvex 0.01Maximum Level Radium 5 pCi/liter Gross Alpha 15 pCi/liter Gross Beta 4 millirem/yr Turbidity 1/TU Coliform Bacteria 1/100 milliliter (Comment: Turbidity is applicable only to surface water supplies.)