The Environmental Working Group has developed an extraordinary, easy to use, nationwide database of drinking water test results. You go to their website, type in your zip code and your water company, and it instantly gives you the water quality test results for your area. And the results will blow your mind. I innocently typed in my zip code and discovered that the tap water I drink every day exceeds the legal limit for Tetrachloroethylene and exceeds the health limit for Trichloroethylene and six other toxic chemicals.
But the EWG doesn't just leave you hanging with bad news, they also provide background information on the chemicals and links to filtration systems you can use to improve water quality in your home. It's a really impressive and helpful tool that I believe, over the long term, will also put a great deal of additional pressure on municipalities to clean up their water supplies. Check it out for yourself.