Hello neighbors,
Please see the joint statement from Montgomery County Department of Environmental Protection and Health and Human Services below.
Additional information, including FAQs, can be found at the County’s new webpage here, which will go live at 11:15am on Monday, June 15.
DEP and DHHS Joint Statement: PFAS Contamination found in a small stream near Great Seneca Highway
Community Meeting:
Wednesday, June 17 at 7pm
DuFief Elementary School
The County will host a public community meeting on Wednesday, June 17 at 7pm at DuFief Elementary School to provide additional information and answer questions from residents.
Overview:
Montgomery County has been notified by the Maryland Department of the Environment (MDE) of elevated levels of perfluoroalkyl and polyfluoroalkyl substances (PFAS) detected in samples taken from Muddy Branch, a stream in the western side of the County, as well as significantly elevated levels in a stormwater pond and small stream running along the south side of Great Seneca Highway and beneath Key West Avenue.
The map shows the tributary and ponds in yellow/red hatching for which a water contact advisory is being issued. People and their pets should avoid contact with the water and refrain from fishing in the water contact advisory areas. The locations of the highest sampling results are adjacent to and on the site of the former Montgomery County Public Safety Training Academy (PSTA). We will continue to evaluate the appropriate extent of the public health advisory and whether to lift any aspects of the advisory based on sampling data going forward.
WSSC Water has confirmed that drinking water treated from the Potomac River remains in compliance with federal drinking water standards for PFAS and continues to be safe for consumption. More information from WSSC about PFAS can be found on their website: https://www.wsscwater.com/pfas.
MDE recommends that all private well owners, regardless of location, get their well water tested at least once a year to ensure that their water is safe to drink and to include PFAS in that testing. General sampling and maintenance recommendations for private drinking water wells can be accessed on MDE’s Be Well Wise webpage (https://mde.maryland.gov/programs/Water/Water_Supply/Pages/Be_Well_Wise.aspx).
MDE provides a list of state-certified laboratories, and PFAS related guidance for private well owners on this factsheet: https://mde.maryland.gov/PublicHealth/Documents/PFAS%20Private%20Well%20Factsheet_March2023.pdf. The fact sheet also provides guidance on additional treatment options that can be installed in homes and buildings (see page three of the fact sheet).
PFAS, commonly known as “forever chemicals,” are human-made chemicals used since the1940s in a wide range of everyday products, and research has shown that long-term exposure may increase the risk for certain types of cancer.
Although there are currently no federal standards for PFAS in stream water, the levels detected in sample locations shown on the map are substantially higher than what would be expected in a natural environment.
What is the County doing?
- Issuing a Public Health Advisory (link to statement)
- Issuing alerts and posting signage cautioning residents about the water contact advisory for the specific tributary and ponds identified in the map. (link to sign)
- Directly notifying residents living near the areas with the highest sample results and providing additional information and online resources.
- Contacting well owners within one mile of the highest sample results and offering to test their wells.
- Conducting additional testing, including groundwater and soil in the affected areas to inform remediation plans.
- Taking strong science-based steps to investigate the potential health and environmental risks and guide actions to protect public health and the environment.
- Forming a Task Force, comprised of representatives from Montgomery County Department of Environmental Protection (DEP), Montgomery County Department of Health and Human Services (DHHS), Maryland Department of Environment (MDE), Washington Suburban Sanitary Commission (WSSC Water), Montgomery County Office of the County Attorney, and Montgomery County Parks.
How can the public stay informed?
Throughout this investigation, DEP and DHHS will update the public as soon as new information becomes available. We are committed to keeping the public informed in the following ways:
- Hosting public community meetings, beginning with one on Wednesday June 17, 2026 at 7:00PM, held at DuFief Elementary School located at 15001 DuFief Drive, North Potomac, 20878
- Answering community questions through 311
- Updates posted on a new website found at MontgomeryCountyMD.gov/PFAS
To continue to stay informed, please sign up for email alerts at https://rebrand.ly/PFASTributaryofMuddyBranch
Sincerely,
Jennifer
Jennifer Macedonia
Director
Department of Environmental Protection
Montgomery County, Maryland
2425 Reedie Drive, 4th Floor
Wheaton, Maryland 20902
Office: 240-777-7781
Mobile: 240-890-6921




