Atrazine in our water supply, what are the risks?

For decades, farmers, lawn care workers and professional green thumbs have relied on the popular weed killer atrazine to protect their crops, golf courses and manicured lawns. But atrazine often washes into water supplies and has become among the most common contaminants in American reservoirs and other sources of drinking water.
Now, new research suggests that atrazine may be dangerous at lower concentrations than previously thought. Recent studies suggest that, even at concentrations meeting current federal standards, the chemical may be associated with birth defects, low birth weights and menstrual problems. Laboratory experiments suggest that when animals are exposed to brief doses of atrazine before birth, they may become more vulnerable to cancer later. An investigation by The New York Times has found that in some towns, atrazine concentrations in drinking water have spiked, sometimes for longer than a month. But the reports produced by local water systems for residents often fail to reflect those higher concentrations. Atrazine is just one example of what critics say are regulatory weaknesses in the protections of America’s drinking water. Health and environmental advocates argue that the laws safeguarding drinking water and policing toxins are insufficient, and that the E.P.A. is often too slow in evaluating emerging risks, not cautious enough and too unwilling to warn the public when health concerns arise. In January, a Government Accountability Office report said that the E.P.A.’s system for assessing toxic chemicals was broken, and that the agency often failed to gather adequate information on whether chemicals posed health risks. Forty percent of the nation’s community water systems violated the Safe Drinking Water Act at least once last year, according to a Times analysis of E.P.A. data, and dozens of chemicals have been detected at unsafe levels in drinking water.


Links: http://www.nytimes.com/2009/08/23/us/23water.html?_r=2&scp=1&sq=atrazine&st=cse
http://www.nytimes.com/imagepages/2009/08/23/us/23water_graphic4_ready.html