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In LA county, Hyperion (for the city of LA) and the Joint Water Pollution Control Plant (for a lot of the rest of the county) serve about 7 million people out of 10 million and do secondary treatment. Another 1.5 million or more have full treatment done with the output recycled (though nobody's drinking that as far as I know, it's used for irrigation, refining oil, etc.). I went on a tour of the Detroit sewage treatment plant once, which was pretty interesting; I should tour the ones here too.
Anyway, most bodies of water in the US are probably a LOT cleaner now than they were 50 to 150 years ago.
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"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." --Abraham Lincoln
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