I use this site to look at their valuable information. If you are wondering the health of your water or where you want to move to this is where you can check. Also they have several consumer guides to verify products you might use to clean with or foods that have the most pesticides. A plethora of information really. So valuable that I feel everyone should have this bookmarked.
Info on EWG from their website: The Environmental Working Group’s mission is to empower people to live healthier lives in a healthier environment. With breakthrough research and education, we drive consumer choice and civic action.