In 2014, the Horsham and Warrington Township Water Authorities conducted sampling in their public water supply wells, under the EPA third Unregulated Contaminant Monitoring Rule, and discovered PFAS contamination. Past use of aqueous film-forming foam (AFFF) is likely the source of the PFAS contamination on site.
In 2016, the EPA lifetime health advisory (HA) of 0.07 µg/L for PFOS or PFOA or combined PFOA and PFOS. Following the EPA lifetime HA: 1. Impacted public wells in the Horsham and Warrington public water supplies were taken off-line and filtration systems installed; 2. Private well users were provided alternative water sources (e.g. bottled water or public water connects); and 3. Site mitigation efforts have occurred.