I had often found sportfish near and within sewage treatment plant discharges of varying qualities or their immediate downstream plumes. It was always memorable….wild ST in Willow Ck, Berks Co; RT and BT in Plum Ck, Berks Co.; SMB in Dunkard Ck, Greene Co; striped bass in the Delaware Estuary, Delaware Co; American shad, Delaware R, Northampton Co.; channel catfish, Delaware Estuary. At the time, I never associated that with drugs, but speculated that it was attractive temps and forage.