Not to drink, but don't animals live in the bay that you eat? Like crabs?
Or are crabs able to filter out that bad stuff and can still be eaten?
I know we close shrimping along the Gulf Coast when the red tide is present.
If the oyster bars are not contaminated with fecal coliform or other contaminants, they may be safe.
But when you eat an oyster, you eat the digestive tract, too, basically all of the critter but the shell.
Crabs and fish will pick up some of what is in the water, it just depends on how much is trapped by the tides and for how long. Unlike the filter feeders, crabs have an intestinal tract that is only eaten in fried soft crabs, not steamed hard crabs, so they may be safer. Many of the fish in the Potomac and tributaries are now descendants of the catfish released into the Rhappahannock River in Virginia with the idiotic expectation they would stay there. They did not and are an invasive species in the Potomac and tributary estuaries, and I would expect the Chesapeake Bay as well.