ed lavandera is in san juan with the details. ed, this is very important reporting that you and your team have been doing. what are you learning? >> reporter: well, this is an area in a town of dorado west of the capital here in san juan where we're at. it's a relatively small area but it is an area designated as a super fund site. super fund sites are designated by the environmental protection agency and it's basically a list of some of the most contaminated pieces of land in the country. this happens, you know, all over the place. but in this particular case, there are a number of water wells on that land and there had been reports and we have seen it ourselves over the course of the last few weeks that people have been tapping into the water wells desperate for water. several of those residents we have spoken to said they have used it in recent days as a source of drinking water. over the weekend, a team of sh did from the environmental protection agency was out there taking water sal pls. they're in the process of testing the water for industrial toxins believed to be in the grou