Study: High levels of arsenic, uranium found in CT wells

The colors on this map identify the estimated percentage of private wells in Connecticut with water containing uranium concentrations greater than 30 micrograms per liter, the U.S. Environmental Protection Agency’s maximum contaminant level for uranium in drinking water supplies. The green symbols identify uranium concentrations in water from sampled wells. White areas on the map, representing 2.3 percent of the state, indicate geologic units from which no uranium samples are available.