PFAS contamination in mosquito control products emerged as a public health issue when a product similar to one used in Maryland was tested in Massachusetts and found to have high levels of PFAS, prompting Public Employees for Environmental Responsibility and Maryland Pesticide Education Network to test Permanone 30-30, a product widely used in Maryland’s mosquito control program. An EPA-approved lab found PFAS at dangerously toxic levels in the Permanone sample. (A subsequent test by a different lab on other samples provided by Bayer and Maryland Department of Agriculture were found to be PFAS-free, but it is unclear why the two EPA-approved labs found different results. While the second test checked for 28 PFAS, there are over 12,000 PFAS chemicals.)
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