At toxic cleanup sites across the country, environmental agencies have allowed groundwater contamination to go untreated and slowly diminish over time—a strategy that saves money for polluters but could cost taxpayers dearly and jeopardize drinking water supplies.

There are many ways parents can reduce children's exposure to lead before they are harmed. Lead hazards in a child's environment must be identified and controlled or removed safely. Lead is invisible to the naked eye and has no smell.

Today, The Dig dives into water. Pun totally intended. I’ve received a lot of questions about applying investigative reporting techniques to figuring out whether your water is safe — the stuff in your taps, the stuff in your rivers, the stuff at the beach. Flint, Michigan, has made us all want to be water sleuths.