I thought you'd find this of interest. If it's true there, it's true everywhere -

"In the Rockies today, the most comprehensive study ever of Colorado water quality turned up supposedly safe levels but a worrisome prevalence of 62different unregulated chemicals.

The U.S. Geological Survey's study found a long list of contaminants, only 10 percent to 15 percent of which are regulated, and those at levels below  what officials consider threats to human health. "

"But the presence of so many chemicals in the surface water of a headwaters state startled researchers; they said the study will lead to a better understanding of the sources and dispersion of chemicals into water supplies."

Quote of the day:

"None of the concentrations exceed the regulatory limit, but we don't know what the human health impacts are."

Lori Sprague, chief author of a study on Colorado water quality that found a disturbing array of drugs, detergents and household chemicals in Front Range water.

- Denver Rocky Mountain News

You may view the study in its entirety here:

http://water.usgs.gov/pubs/fs/2004/3127/