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The U.S. Geological Survey (USGS) and the Center for Applied Environmental Research at the University of Michigan-Flint (CAER) mapped distributions of arsenic, nitrate, and chloride in the groundwater of Oakland County. Emphasis was placed on sites that exceeded Maximum Contaminant Levels (MCL) and Secondary Maximum Contaminant Levels (SMCL) set by the U.S. Environmental Protection Agency. The maps were based on historical data from records compiled by the Michigan Department of Environmental Quality (MDEQ). The USGS collected and analyzed samples to test the water quality in a number of these wells to confirm the overall validity of the historical records. The maps showed that each of the chemical constituents is widely distributed. High concentrations of arsenic are most

Arsenic, nitrate, and chloride in groundwater, White Lake Township, Oakland County, Michigan