"Polluters are currently not allowed to dump toxic substances into a major river -- and that wouldn't change. So far, so good. But it would become perfectly legal to dump the same poisons into a stream that flows into that same river. Or as Justice David Souter aptly said: "All you've got to do is dump the pollutant far enough up the water system to get away scot free."
To think that's what Congress intended is absurd."