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Drinking water / MD

PFAS in Maryland drinking water

83 Maryland public water systems tested under UCMR5. 30 detected at least one PFAS compound; 53 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.

Water systemServesHighest results (ng/L)Reading
BOONSBORO - KEEDYSVILLE

MD0210002

WashingtonPFHxA 8.9PFBS 7.2PFOA 6.7 *PFPeA 4.1above final limit
CITY OF ABERDEEN

MD0120001

HarfordPFBA 9.4PFPeA 8.7PFOS 8.6 *PFHxA 8.2above final limit
CITY OF FRUITLAND

MD0220008

WicomicoPFOS 4.1 *PFHxS 4above final limit
CITY OF SALISBURY

MD0220004

WicomicoPFOS 20 *PFBS 6.2PFHxS 6.2PFOA 5.9 *above final limit
CITY OF TANEYTOWN

MD0060012

CarrollPFBS 15.1PFOS 10.7 *PFPeA 5.6PFOA 4.6 *above final limit
CITY OF WESTMINSTER, MD

MD0060015

CarrollPFPeA 66.7PFHxA 24.6PFBA 20.1PFOA 12.4 *above final limit
GLENELG COUNTRY SCHOOL

MD1130003

HowardPFPeA 22.1PFHxA 13.7PFOA 10 *PFBA 8.3above final limit
MARYLAND AMERICAN WATER COMPANY

MD0120003

HarfordPFPeA 10.5PFHxA 9.5PFOA 9.3 *PFOS 9.1 *above final limit
NEW LIFE CHRISTIAN SCHOOL

MD1100052

FrederickPFPeA 24PFHxA 15.4PFOS 15.3 *PFBS 14.3above final limit
TOWN OF ELKTON

MD0070011

CecilPFOA 23.3 *PFPeA 14.4PFHxA 12.8PFBS 12.3above final limit
TOWN OF HAMPSTEAD

MD0060003

CarrollPFPeA 17.3PFHxA 14.9PFBS 13.4PFOA 9.1 *above final limit
TOWN OF MANCHESTER

MD0060006

CarrollPFBS 16.8PFBA 5.7PFOA 4.7 *PFPeA 3.7above final limit
TOWN OF MIDDLETOWN

MD0100018

FrederickPFPeA 9.2PFOS 6.7 *PFHxA 6.2PFBS 5.2above final limit
TOWN OF MOUNT AIRY

MD0060007

CarrollPFPeA 22.7PFHxA 18.4PFOA 12.7 *PFBA 11.6above final limit
TOWN OF POOLESVILLE

MD0150002

MontgomeryPFPeA 15.1PFHxA 9.8PFBA 8.9PFHxS 6.9above final limit
TOWN OF THURMONT

MD0100023

FrederickPFOS 48 *PFOA 15 *PFHxS 5.3PFBS 4.3above final limit
CITY OF BALTIMORE

MD0300002

BaltimorePFPeA 3detected
CITY OF FREDERICK

MD0100015

FrederickPFPeA 3.1detected
CITY OF ROCKVILLE

MD0150003

MontgomeryPFPeA 6.5PFHxA 5.8PFBA 5.2PFBS 3.6detected
FORT DETRICK

MD0100011

FrederickPFPeA 3.9detected
FREEDOM DISTRICT

MD0060002

CarrollPFPeA 3.4PFHxA 3.1detected
HOWARD COUNTY D.P.W. DISTRIBUTION

MD0130002

HowardPFPeA 3.6PFHxA 3.4detected
MANOR SHOPPING CENTER

MD1030054

BaltimorePFPeA 3.4detected
MGM NATIONAL HARBOR

MD1160049

Prince George'sPFBA 6.2detected
NEW DESIGN - FREDERICK COUNTY

MD0100030

FrederickPFPeA 3.3detected
OCEAN PINES

MD0230005

WorcesterPFBA 7.8PFBS 3.7detected
TOWN OF BERLIN

MD0230001

WorcesterPFPeA 6.8PFHxS 4.9PFHxA 4.8PFHpA 3.5detected
TOWN OF NORTH EAST

MD0070016

CecilPFBA 12.5detected
WALDORF - CHARLES COUNTY DPW

MD0080049

CharlesPFPeA 6PFHxA 5.1PFBS 3.1detected
WASHINGTON SUBURBAN SANITARY COMMISSION

MD0150005

MontgomeryPFPeA 6.7PFHxA 4.8detected

* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.

Systems with no PFAS detected

53 tested systems reported no PFAS above the laboratory reporting limits. Each has its own page with its sampling detail.

A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options