July 30, 2010
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The Cooler - 8/26/09

How Much Weed Killer Is Safe in Your Water Glass?

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. .../more - New York Times


EPA Fails to Inform Public About Weed Killer in Drinking Water, Huffington Post Investigation Reveals - Democracy Now

EPA Ignoring Problem of Herbicide in Drinking Water -- Report - OMB Watch

Today's Toxin: Atrazine, the Weed Killer in your Water - Tree Hugger

Group warns of high atrazine levels in water - Minnesota Public Radio

US Drinking Water and Watersheds Widely Contaminated by Hormone Disrupting Pesticide, Atrazine - Common Dreams

Thanks to EPA You May Be Unknowingly Drinking Water Contaminated With Weed Killer - AlterNet

Tap water, weedkiller — and dispute over safety - Seattle Times, WA

Debating How Much Weed Killer Is Safe in Your Water Glass - New York Times




Tree Hugger


Altrazine in Canada

The interim maximum acceptable concentration (IMAC) for atrazine in drinking water is 0.005 mg/L (5 µg/L). The guideline is applicable to the sum of atrazine and its N-dealkylated metabolites.

Atrazine is used extensively in Canada as a pre- and post-emergence weed control agent, primarily for corn but also for rapeseed, and for total vegetation control in non-cropland and industrial areas. Nearly 2 million kilograms of active ingredient (a.i.) were sold in Canada in 1988, about 70% of this being sold in Ontario.

In areas where atrazine is used extensively, it (or its dealkylated metabolites) is one of the most frequently detected pesticides in surface and well water. Atrazine contamination has been reported in British Columbia,9 Nova Scotia, Prince Edward Island, Quebec, Ontario and Saskatchewan.10 In 1985, 85% of ambient water samples in one area of southwestern Ontario were found to be contaminated with traces of atrazine.11 Similar results have been reported for surface waters in Quebec.10 In Ontario farm wells, atrazine was detected at levels at or above 1 µg/L in 17% of 351 wells monitored during the 1985 Alachlor Monitoring Survey by the Ontario Ministry of the Environment.12 The maximum recorded concentration was 1200 µg/L, and the median concentration of the 59 positive samples whose concentrations were recorded was 2.5 µg/L (trace concentrations -- below 1 µg/L -- were not recorded). Only about 100 of these wells were used for domestic water supplies, but two-thirds of these tested positive for atrazine.11 Nine municipal supplies were also tested. Dresden, Ontario, in the corn-belt region of southwestern Ontario, was the only municipality seriously affected, with positive atrazine results in 39 out of 54 analyses on its raw water supply.../more - Health Canada

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