Why? The quality of our nation's water supply is a serious issue.
The eco-weenies may exploit that issue to bizarre extremes,
but it is an issue that needs to be addressed nonetheless.
Rivers and lakes which were dead have regenerated. The rivers in this country in 1880 were ten times filthier than today, especially the urban area stretches.
I have flown sea planes all over the country since 1979. The rivers today are the healthiest ever. There are even fresh water clams in the Delaware river and Schukyll River that run thru Philadelphia. The Hudson is amazingly clean despite the temptation to stir up PCB's to whip up some campaign cash.