[hellbender]

It wasn’t urine which spread polio, but fecal contamination. Any responsible municipality with a surface water supply, like a reservoir, is going to give the water filtration (which will remove many pathogens), possibly coagulation with chemicals to help remove particles, followed finally by disinfection, usually with chlorine. One man urinating in the reservoir is completely trivial.

[Paridel]

It wasn’t urine which spread polio, but fecal contamination.

No arguments here. I personally don't understand why you would have an open air reservoir when terrorists are considering going after our water supplies, but some guy peeing it is no reason to drain it. I was just trying to explain why pools are closed when someone defecates in them.

-paridel