Here's a story on the CNN web site.

http://www.cnn.com/2010/TECH/science/03/01/pesticide.study.f...

"The effects of atrazine in the long term have been shown to demasculinize or chemically castrate [frogs], combined with complete feminization of some animals," said lead researcher Tyrone B. Hayes, a biologist and herpetologist at the University of Berkeley.

The Natural Resources Defense Council, an advocacy organization, released a report in August 2009 that documented spikes of atrazine in the water supplies of Midwestern and Southern agricultural areas where the pesticide is primarily applied.

Perhaps there is a niche market for bottled water from "special" wells.