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Ridge Run PFAS Site

Site Facts

Municipality/County: East and West Rockhill Townships, Bucks County
HSCA Site Since: 2016
Primary Contaminants of Concern: perfluorooctanoic acid (PFOA) & perfluorooctane sulfonate (PFOS)

Introduction/Site Discovery

  • Pursuant to its authority under the Hazardous Sites Cleanup Act of 1988 (HSCA), DEP is investigating groundwater in the area. The purpose of the investigation is to determine the extent of PFOA and PFOS in the aquifer underlying the area, which we are referring to as the Ridge Run PFAS HSCA Site.
  • After one public supply well in the area was found to contain combined concentrations of PFOA and PFOS that exceeded EPA's 70 ppt Health Advisory Limit (HAL), and another public supply well was found to contain combined concentrations slightly below the HAL, DEP immediately took steps to begin a thorough investigation of the surrounding area.

Private Drinking Water Investigation

  • Since November 2016, DEP has collected samples from more than 170 private wells within the area of interest surrounding the original contaminated public supply wells.
  • Results of this sampling ranged from non-detect (ND) to 16,360 ppt combined for PFOA/PFOS.
  • There are currently 13 properties which have had results above the HAL and are either equipped with effective carbon filtration systems or are receiving bottled water.
  • There are 2 properties which have had results above 40 ppt that are being monitored for any fluctuation above the HAL.

Source Investigation

In Spring 2019 - DEP plans to install several monitoring wells at the Site. The monitoring wells will help DEP determine the vertical and horizontal extent of the groundwater contamination in the area.

Press Releases/Public Notification

June 2, 2018: PA Bulletin Notice of Proposed Interim Response Ridge Run PFAS HSCA Site

Interim Response Action

  • DEP's responsibility under HSCA is to select a remedy that is protective of human health and the environment and complies with all statutory and regulatory requirements.
  • In May 2018, an Analysis of Alternatives and Proposed Response document was signed by DEP selecting the installation and maintenance of whole-house filtration systems as a proposed interim response to address the contamination of private drinking water wells associated with the Site. The information DEP used in formulating its proposal is incorporated into the Administrative Record.
  • The Administrative Record was open for public comment between June 2, 2018 and August 31, 2018.
  • Copies of the Administrative Record are available for public review at the DEP office in Norristown, and the East and West Rockhill Township Offices.
  • DEP held a public hearing on July 11, 2018 at the West Rockhill Township Building.
  • DEP's Statement of Decision and Response to Public Comments Documents are coming soon.

Contacting DEP

To schedule an appointment to review files associated with this Site and project, please call the Norristown Office at 484-250-5910. Please direct correspondence or inquiries to one of the following:

Site Information: Colin Wade by telephone at 484-250-5722 or by email at

Community and Media Relations: Virginia Cain, Community Relations Coordinator at 484-250-5808 or

Municipality Information

East Rockhill Township: Phone: (215) 257-9156,

West Rockhill Township: Phone: (215) 257-9063,