We live in a costal waterway...an hour from the ocean with many rivers that feed the Chesapeake Bay. My daughter and I enjoyed observing the wildlife on the shore of the river that is walking distance from our home. For years we have known of the pollution. But it really hits home when you read a sign on a fishing dock that warns you not to eat the fish or crabs because of PCPs, Mercury, and Dioxin contamination. To the untrained eye these waterways are pristine and a place to relax and enjoy the bounty within. Many families have been eating the fish and crabs from these waters for years. For some its a staple. Sadly many folks were fishing and crabbing and ignoring the warning.
We came home to learn what we could about the chemicals. We printed out a map that shows what chemicals are most prominate in the water ways and were shocked!!!!! You can view the map and info here ( I could not download the maps) http://www.vdh.virginia.gov/Epidemiology/dee/PublicHealthToxicology/Advisories/JamesRiver.htm
I am sure you can find similar maps of your state. Might be worth a look!