07/14/2010 05:12 am ET Updated May 25, 2011

Nitrate Contamination: California Communities' Water Supply Contains Harmful Levels

The water supply of more than two million Californians has been exposed to harmful levels of nitrates over the past 15 years -- a time marked by lax regulatory efforts to contain the colorless and odorless contaminant, a California Watch investigation has found.

Read more on California Watch