PFAS Case Study: Horsham Water and Sewer Authority (HWSA)

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Horsham Water and Sewer Authority’s (HWSA) public water system supplies drinking water to approximately 7,800 residential, commercial, and industrial customers in Horsham Township, just north of Philadelphia, Pennsylvania. HWSA’s water system is supplied by 14 deep water wells and purchased water from two adjacent water suppliers, Aqua PA and the North Wales Water Authority (NWWA). HWSA treats water supplies with 11 PFAS treatment facilities, which range in size from 0.23 to 0.40 million gallons per day (MGD).

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In 2014, HWSA conducted monitoring for six per- and polyfluoroalkyl substances (PFAS) as part of the Third Unregulated Contaminant Monitoring Rule (UCMR 3). UCMR 3 Monitoring of HWSA’s public supply wells revealed concentrations of PFAS that were among the highest levels found in drinking water systems in the country. In particular, PFAS levels in two groundwater wells were found to be in excess of the then-existing USEPA provisional health advisory (PHA) levels for 200 parts per trillion (ppt) PFOS and 400 ppt PFOA. In response, both wells were immediately taken out of service. Subsequent testing of the other wells using analytical methods with lower method detection levels detected PFAS at all 14 of HWSA’s wells.

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