Weed Killer in Tap Water Dangerous? EPA Lets Industry Answer

Companies with a financial interest in a weed-killer sometimes found in drinking water paid for thousands of studies federal regulators are using to assess the herbicide’s health risks, records of the U.S. Environmental Protection Agency show. Many of these industry-funded studies, which largely support atrazine’s safety, have never been published or subjected to an independent scientific peer review.

Meanwhile, some independent studies documenting potentially harmful effects on animals and humans are not included in the body of research the EPA deems relevant to its safety review, the Huffington Post Investigative Fund has found. These studies include many that have been published in respected scientific journals.

EPA records obtained by The Huffington Post Investigative Fund show that at least half of the 6,611 studies the agency is reviewing to help make its decision were conducted by scientists and organizations with a financial stake in atrazine, including Syngenta or its affiliated companies and research contractors.


More than 80 percent of studies on which the EPA are relying have never been published. This means that they have not undergone rigorous “peer review” by independent scientists, a customary method to ensure studies are credible and scientifically sound before they can be published in major journals.

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Weed Killer in Tap Water Dangerous? EPA Lets Industry Answer