Unfortunately, it is difficult if not impossible to find an environmental issue where the desire to do something has not overwhelmed any questions of the effectiveness of what is being done. The political nature of such things is that one must only win the battle of conventional wisdom. This is true of such things as, say radon, "the second leading cause of lung cancer after smoking". And yet, the actual numbers approach unmeasurable or statistically insignificant. Don't get me going on the dangers of second hand smoke.
The perhaps most interesting thing is that most US cities of any significant size have underequipped sewage treatment systems. For instance, during heavy rains the storm sewer and sewage system of Grand Rapids, Michigan overflows into the Grand River and eventually finds it's way into Lake Michigan. The law, if implemented, would put someone like tjk for instance in an interesting position of having to defend himself after a little sail up to Grand Haven as to whether the effluent around his boat was his or person's unknown fifty miles away.
And then, as with Alar, acid rain, and a myriad of others there will be no money, and less interest, to see if the regulations actually work.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.