Interesting article about contaminated salmon in Seattle Washington, and the suspected source is tainted wastewater discharges. The fish had elevated levels of Prozac, Advil, Benadryl, Lipitor and even cocaine, as well as many other drugs.
Even fish tested in the Nisqually estuary, which receives no direct municipal treatment-plant discharge, were contaminated.
I hope it's not happening in the Great Lakes!
https://weather.com/news/news/salmon-caught-near-seattle-tested-positive-for-wide-range-of-drugs