"In some cases we have peak concentrations that are 100 times or more higher than those benchmarks of safe levels." Morrissey said. She and her fellow researchers have sampled hundreds of wetlands and have found that "upwards of 80 to 90 per cent of the wetlands are contaminated."

http://www.cbc.ca/news/canada/saskatchewan/pesticide-contaminating-prairie-wetlands-scientist-1.2482082

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