Environmental Alert
(by Matt Wood)
On June 3, 2021, the Wolf administration released the complete results of sampling for perfluoroalkyl and polyfluoroalkyl substances (PFAS) by the Pennsylvania Department of Environment Protection (PADEP) from certain public drinking water systems located throughout the Commonwealth. PFAS, a “family” of manmade chemicals in use since the 1940s, have myriad applications in consumer, commercial, and industrial products. More recently, PFAS have been discovered in various environmental media (e.g., drinking water sources), plants, animals, and humans. Due to their persistence in the environment – they do not tend to break down naturally – PFAS have been called “forever” chemicals and some research suggests that exposure to PFAS can cause various adverse health effects.
Originally initiated in June 2019, the PADEP-led sampling effort targeted public drinking water systems within a half mile of potential PFAS sources (e.g., manufacturing, fire training, and military facilities). PADEP also sampled outside of the half-mile radius of potential sources to establish a baseline. Samples collected in 2019 were analyzed for six PFAS chemicals, but those collected in 2020 and 2021 were analyzed for 18 PFAS chemicals using U.S. Environmental Protection Agency (EPA) Method 537.1 (updated November 2018). As part of the 2020 and 2021 sampling events, PADEP resampled the 2019 sites in order to obtain additional occurrence data.
Of the 18 PFAS chemicals analyzed from the 412 total samples, only eight were found at the sampled sites: PFOS, PFOA PFNA, PFHxS, PFHpA, PFBS, Perfluorohexanoic acid (PFHxA), and Perfluoroundecanoic acid (PFUnA). PFOA and PFOS were the most common, being present at 112 and 103 sites, respectively. In only two locations, however, did the combined PFOA/PFOS concentration exceed the combined PFOA/PFOS 70 parts per trillion (ppt) Health Advisory Level (HAL) set by EPA, which is intended to identify the concentration of PFOA/PFOS in drinking water at or below which adverse health effects are not expected to occur over a lifetime of exposure. …