"COLUMBIA, SC --  Since a power company began digging up coal ash from a leaking waste pond west of Myrtle Beach, arsenic levels have dropped dramatically in groundwater, according to an environmental group that pushed to have the ash removed."

"Water departments that use controversial lead-testing practices have told the Guardian they will change their methods after an investigation revealed they were not following environmental guidelines."

"A water provider in northern Alabama warned more than 100,000 customers on Thursday not to drink or cook with tap water, saying it could be contaminated with potentially dangerous levels of a chemical that federal health officials have linked to cancer, according to local media reports."

"Our waterways are filled with traces of drugs, says a new study conducted by the USGS."

"A Guardian investigation reveals that testing regimes similar to that of Flint were in place in major cities including Chicago, Boston and Philadelphia".

"Scientists may have significantly underestimated a dangerous source of pollution in the atmosphere, new research suggests. A satellite study, published Monday in the journal Nature Geoscience, has revealed nearly 40 previously unreported major sources of sulfur dioxide emissions — a pollutant that can cause multiple harmful health and environmental impacts and even exacerbate global warming."

"Canada and the United States have identified eight substances in the water of the Great Lakes as chemicals of mutual concern under the Canada-U.S. Great Lakes Water Quality Agreement. These chemicals are potentially harmful to human health or the environment or both."

"California officials have talked tough about the contamination of up to 10,000 homes with lead from a battery recycling plant, calling it a regulatory failure, an environmental injustice and a public health disaster. Yet accountability for years of pollution by Exide Technologies has been scant."

"The cost of replacing water lines in Flint, Michigan, has nearly doubled amid a health crisis from high lead levels in drinking water, the Detroit Free Press reported on Saturday."

Green infrastructure projects in Philadelphia are helping keep sewage from polluting rivers.