Two environmental organizations - - Friends of Milwaukee's Rivers and Midwest Environmental Advocates (a public interest law firm) - - are trying to use the US Clean Water Act to stop something pretty unbelievable:

A Milwaukee business is routinely dumping toxins, including cancer-causing chemicals, into the Milwaukee Metropolitan Sewerage District system - - but the MMSD's treatment methods cannot get the poisons out.

Which means they flow into Lake Michigan, where any number of cities get their drinking water, and from which people eat fish.

 Details here. [1]