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Ongoing PFAS Investigation - State and Local Updates

September 15, 2017: In May, the NH Department of Environmental Services advised municipalities that impacts to groundwater from PFOA (perfluorooctanoic acid) and PFOS (perfluorooctane sulfonate), collectively referred to as PFAS (per- and polyfluoroalkyl substances), had been identified in several NH communities. In use since the 1940s, these compounds have been widely utilized in industrial applications and in consumer products because of their properties to resist heat, oil, grease, stains, and water. In the environment, they are stable, persistent, and bioaccumulative. In 2016, the NHDES established "Ambient Groundwater Quality Standards" (AGQS) of 70 nanograms per liter (ng/L, equivalent to parts per trillion [ppt]) for PFAS.

In June, the NHDES conducted sampling and analysis of drinking water wells in many locations, including Windham's municipal center. The testing revealed the presence PFAS at the following Town buildings:

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