Authorities say arsenic levels in the Kok Thai river now exceed safety limits, sparking fears of ecological disaster ...

Only 40 miles separate voracious Asian carp from the Great Lakes. To stop them, Illinois must reckon with its legacy of coal ash pollution.

Radioactive waste from the Portsmouth Gaseous Diffusion Plant was discharged into Ohio rivers and creeks for decades. Learn ...

Two dog deaths have been connected to a type of harmful algae that’s new to the Columbia River, Clark County Public Health ...