Toxic chemical plume from former Gelman Sciences property on EPA's National Priorities List.

Tens of thousands of wells across Arizona dump fluids into, rather than pulling them out of, the ground. They are used for everything from aquifer recharge to copper mining, and could one day bring ...

The former Gelman Sciences Inc. contamination includes 1,4-dioxane, which can cause cancer and liver and kidney damage.

Students are working with the City-County Health Department to reach the countless residents who rely on private wells for their water.

65,000 liters of bright red tracer-tagged chemical entering the ocean sounds less like climate research than a cleanup emergency. In fact, the release was part of a closely watched experiment in ocean ...