It would not be feasible to filter every river nor the direct runoff that is not in streams, but which enters the ocean along every coast when it rains.
As of right now, it appears that there are no such systems in place. Up until recently, the focus has been placed on monitoring contaminant levels, not removing them. However, solutions are coming. The University of Illinois Chicago is working on a program to develop a runoff water filtration system, focusing on contaminants from paved streets near city beaches along Lake Michigan. Another approach sponsored by the US Department of Agriculture in conjunction with the University of Missippi will use rice paddies to filter the water, removing contaminants and producing a staple food source. Double Bonus!
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