So one guy pissed into 50 million gallons of water, so 76% of it is now tainted?
Math time.
Typical urination yields 200 mL of urine. 95% of that is water, so only 10mL of waste is excreted.
50 million gallons = 189,270,589,200 milliliters. That means there are .00005 ppm (parts per million) of human waste in the reservoir. And all this is in addition to the fact that urine is sterile.
English
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A simple application of math and logic where knee jerk reactions usually abound would probably save humanity as a whole a lot of trouble.