Even though PCBs (polychlorinated biphenyls) have been banned in the U.S. since 1979, humans still risk exposure via water, air, and the natural food chain. Fish are one food source at risk of PCP ingestion, and unfortunately these man-made chemicals don’t break down, which means you may consume them without knowing.
Chemicals, like PCBs, enter the food chain through the water after they’re disposed of improperly. Fish then ingest chemicals and humans do the same when they consume contaminated fish. Research from the Natural Resources Defense Council, point to the Great Lakes as containing high PCB levels. This means that fish caught in the lakes are at risk. Luckily, you can research locally caught fish and levels of PCBs in surrounding area water by contacting your state health department.