It is a dirty little secret that many of the old houses in these old industrial cities do indeed dump their raw sewage into the storm drain system, which ends up in the Hudson River, untreated. Just walk around outside some morning between 7 and 8, when the air is still, and you will be in for a surprise. Your chances of getting it identified, let alone fixed, are slim. Neither the city nor the homeowner wants the headache. I used to live next to one, so I know how gross it can be. I feel sorry for the fish.