>>619083a healthy person's piss is sterile and contains no disease. it's just salts, vitamins, and other small molecules. we piss away from drinking water because the nitrates can cause algae blooms, and it's nasty.
feces does contain bacteria (at the least) that is almost certain to cause disease in other humans, and maybe animals too. this bacteria can propagate in water sources and cause harm. sure, we treat our water, but there's always the chance that contaminated water can end up on the sides of containers, on our hands/face and so on. finally, I'd rather not step in shit, or have to filter out chunks of it.
