Untreated groundwater in Maryland and almost a dozen other states carries a “very high” risk of being so corrosive that it could contaminate drinking water, according to the U.S. Geological Survey.

Officials warn the groundwater being pumped to homes through wells could leach lead from pipes. About 1 million people on Maryland rely on wells for their water — about one in six state residents.

While water that flows through county or municipal treatment plants or pipes is subject to lead testing, water from wells is not.

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