A recent study by researchers at Columbia University revealed the states that had the highest levels of deadly arsenic in public drinking water.

The only counties without an at-risk water system were Lassen, Modoc and San Francisco. The report found that 61 percent of the state's 3,055 public water systems were not at risk of failing.

30 million Americans live in areas where surface water supply struggles to meet demand, according to a new assessment by the U.S. Geological Survey (USGS).. The report highlights alarming ...

The maps show nitrate levels in domestic well water, with levels from none detected to more than 25 milligrams per liter, for more than 1,700 households in the region. The well testing was part of ...