A while back everyone was in a panic because of a study that said urinating in a chlorinated pool creates a toxic chemical called cyanogen chloride (similar to tear gas). The fact of the matter is a pool would have to be two parts water to one part chlorine in order to create this reaction, and then you'd probably be more concerned with your melting skin and eyeballs. So while it's chemically safe to urinate in a pool, common decency still begs that you hop out and put it in toilet. No one wants to paddle through your yellow cloud.