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DEP Issues Discharge Permit with PFAS Limits to Montgomery County Air National Guard Base


Norristown, PA – The Pennsylvania Department of Environmental Protection (DEP) announced today it has issued a National Pollutant Discharge Elimination System (NPDES) permit containing per- and polyfluoroalkyl substances (PFAS) limits to the Biddle Air National Guard Base (ANGB), formerly known as the Horsham Air Guard Station (HAGS), in Horsham Township, Montgomery County. Water discharged from the site will have a limit of 70 parts per trillion (ppt) for the combined concentration of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), two of the most common PFAS compounds.

NPDES permits are required for any point source discharge to Waters of the Commonwealth. Because ANGB has elevated concentrations of PFAS on the site, limits for these contaminants were included in the permit to control the discharge of treated stormwater and groundwater, which can become available for drinking water. The United States Environmental Protection Agency (EPA) established a drinking water Health Advisory Level (HAL) of 70 ppt for the combined concentration of PFOA and PFOS. The limit of 70 ppt in the permit limit is consistent with EPA’s HAL, as well as permit limits issued to other nearby facilities.

“Establishing limits such as these in our permits is yet another example of the everyday efforts DEP is making to address PFAS in the commonwealth,” said DEP Secretary Patrick McDonnell. “While we work to identify potential new source areas on a statewide level, we continue to look at this issue through a local lens; establishing permit conditions protects local waterways and affected communities.”

More information on Pennsylvania’s efforts to address these chemicals can be found here

MEDIA CONTACT: Virginia Cain,; 484-250-5808

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