National Water-Quality Assessment (NAWQA) Project

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Chloride in Groundwater in the Glacial Aquifer System

Chloride concentrations were greater than the secondary maximum contaminant level established by the U.S. Environmental Protection Agency of 250 milligrams per liter in 2.5 percent of samples from 797 shallow monitoring wells (not drinking water) and in 1.7 percent of samples from 532 drinking-water supply wells. Water samples from shallow monitoring wells in urban areas had the largest concentration of chloride, followed by water samples from agricultural and forested areas (medians of 46, 12, and 2.9 milligrams per liter, respectively)

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Page Last Modified: Tuesday, 04-Mar-2014 14:43:56 EST