Well, this it a bit dry, but gives at least a little information.
As for specifics, basically take every chemical in the area and assume that it makes it into the water. Since there are many different chemicals, a comprehensive list would be a bit longer than you can even print and make a book out of (unless you make it in multiple volumes). That doesn’t even get into the non-chemical components like parasites, bacteria and viruses. Cholera, Salmonella, Giardia, Cadmium, Mercury, gasoline, benzene, random bits from the dead hooker that was dumped into the lake…. and that’s just for starters.
There are a few sites dedicated to sewage and wastewater, but even they generally don’t get too deep into listing EEVVEERRYYTTHHIINNGG in there simply because there are soooo many things that are found in raw sewage.