Here’s some “surprising” news. Your tap water could be unsafe to drink if you live close to a powerful industry that pollutes… 
and US EPA may not intervene on your behalf! Here are some interesting articles that appeared in NY Times about toxic drinking water. Link. Be sure to watch the videos on those pages – very disturbing. Also, there was an interesting documentary on PBS’ Frontline called “Poisoned Waters,” which is very interesting. You can watch that show on their website.
Interestingly, SC DHEC was quoted as saying that protecting business interests was very important for their mission! As an example, here’s a link to articles about the nexus between business interests and DHEC at the expense of public health. Link.