so what i'm worrid about

the NYC sewer system i did some research and i want to know the dangers of sewage and what happens to all the poop. where does it go and why? but looking i found alot of resources and people really concerned for there poop. here is a little thing i found
http://nyconvergence.com/2008/08/nycs-dep-digiti.html

but this is really interesting it shows what i'm assuming are the sewer sheds

http://swimmablenyc.info/?page_id=191

so 14 treatment centers in the city and i never knew, so this is what im worried about