Virginia and Maryland find that nature pollutes itself:

Does a bear leave its waste in the woods?

Of course. So do geese, deer, muskrats, raccoons and other wild animals. And now, such states as Virginia and Maryland have determined that this plays a significant role in water pollution.

Scientists have run high-tech tests on harmful bacteria in local rivers and streams and found that many of the germs — and in the Potomac and Anacostia rivers, a majority of them– come from wildlife dung. The strange proposition that nature is apparently polluting itself has created a serious conundrum for government officials charged with cleaning up the rivers. [Snip]

That leaves scientists and environmentalists struggling with a more fundamental question: How clean should we expect nature to be? In certain cases, they say, the water standards themselves might be flawed, if they appear to forbid something as natural as wild animals leaving their dung in the woods.

“You need to go back and say, ‘Maybe the standards aren’t exactly right’ if wildlife are causing the problem,” said Thomas Henry, an Environmental Protection Agency official who works on water pollution in the mid-Atlantic.

Nature, heal thyself!