EPA found phosphorus and nitrogen from fertilizers, bacteria and other pollutants from urban runoff, plus mercury, in most U.S. rivers and streams. And they didn’t even mention low dissolved oxygen.

Ian Simpson wrote for Reuters, carried by NBC, EPA: More than half of U.S. rivers unsuitable for aquatic life,

Fifty-five percent of U.S. river and stream lengths were in poor condition for aquatic life, largely under threat from runoff contaminated by fertilizers, the U.S. Environmental Protection Agency said on Tuesday.

High levels of phosphorus and nitrogen, runoff from urban areas, shrinking ground cover and pollution from mercury and bacteria were putting the 1.2 million miles of streams and rivers surveyed under stress, the EPA said.

“This new science shows that America’s streams and rivers are under significant pressure,” Nancy Stone, acting administrator of the EPA’s Office of Water, said in a statement.

Twenty-one percent of the United States’ river and stream length was