PFAS in Maryland tap water

16 of 83 tested systems measured above the federal limit. 30 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Town of Thurmont	15 ppt	48 ppt	4 of 29	Above
Town of Elkton	23.3 ppt	7.1 ppt	8 of 29	Above
City of Salisbury	5.9 ppt	20 ppt	6 of 29	Above
New Life Christian School	10.1 ppt	15.3 ppt	7 of 29	Above
Town of Mount Airy	12.7 ppt	6 ppt	7 of 29	Above
City of Westminster, Md	12.4 ppt	6.9 ppt	8 of 29	Above
City of Taneytown	4.6 ppt	10.7 ppt	6 of 29	Above
Glenelg Country School	10 ppt	none detected	7 of 29	Above
Maryland American Water Company	9.3 ppt	9.1 ppt	9 of 29	Above
Town of Hampstead	9.1 ppt	5.7 ppt	8 of 29	Above
City of Aberdeen	7.6 ppt	8.6 ppt	8 of 29	Above
Boonsboro - Keedysville	6.7 ppt	none detected	5 of 29	Above
Town of Middletown	4.9 ppt	6.7 ppt	8 of 29	Above
Town of Poolesville	5.4 ppt	6.5 ppt	8 of 29	Above
Town of Manchester	4.7 ppt	none detected	6 of 29	Above
City of Fruitland	none detected	4.1 ppt	2 of 29	Above
Broad Creek	none detected	none detected	0 of 29	Within
Bryans Road	none detected	none detected	0 of 29	Within
Chapel Hill - Aberdeen Proving Grounds	none detected	none detected	0 of 29	Within
Charlotte Hall Va Home	none detected	none detected	0 of 29	Within
Chesapeake Complex	none detected	none detected	0 of 29	Within
Chesapeake Ranch Estates	none detected	none detected	0 of 29	Within
City of Annapolis	none detected	none detected	0 of 29	Within
City of Baltimore	none detected	none detected	1 of 29	Within
City of Bowie, Md	none detected	none detected	0 of 29	Within
City of Brunswick	none detected	none detected	0 of 29	Within
City of Cambridge	none detected	none detected	0 of 29	Within
City of Cumberland	none detected	none detected	0 of 29	Within
City of Frederick	none detected	none detected	1 of 29	Within
City of Frostburg	none detected	none detected	0 of 29	Within
City of Hagerstown	none detected	none detected	0 of 29	Within
City of Havre de Grace	none detected	none detected	0 of 29	Within
City of Pocomoke City	none detected	none detected	0 of 29	Within
City of Rockville	none detected	none detected	4 of 29	Within
Crofton-odenton	none detected	none detected	0 of 29	Within
Eastern Correctional Institute	none detected	none detected	0 of 29	Within
Eastern Region Allegany Distrib. System	none detected	none detected	0 of 29	Within
Easton Utilities	none detected	none detected	0 of 29	Within
Elkton West	none detected	none detected	0 of 29	Within
Fort Detrick	none detected	none detected	1 of 29	Within
Fort George G. Meade	none detected	none detected	0 of 29	Within
Freedom District	none detected	none detected	2 of 29	Within
Glen Burnie-broadneck	none detected	none detected	0 of 29	Within
Harford County D.p.w.	none detected	none detected	0 of 29	Within
Howard County D.p.w. Distribution	none detected	none detected	2 of 29	Within
Lavale Sanitary Commission	none detected	none detected	0 of 29	Within
Lexington Park	none detected	none detected	0 of 29	Within
Manor Shopping Center	none detected	none detected	1 of 29	Within
Mgm National Harbor	none detected	none detected	1 of 29	Within
Midland-lonaconing	none detected	none detected	0 of 29	Within
Mystic Harbour	none detected	none detected	0 of 29	Within
Naval Support Facility, Indian Head	none detected	none detected	0 of 29	Within
New Design - Frederick County	none detected	none detected	1 of 29	Within
Oakville Elementary School	none detected	none detected	0 of 29	Within
Ocean Pines	none detected	none detected	2 of 29	Within
Patuxent Naval Air Station (navfac-wash)	none detected	none detected	0 of 29	Within
Penn-mar Organization, Inc.	none detected	none detected	0 of 29	Within
Piney Point	none detected	none detected	0 of 29	Within
Prince Frederick	none detected	none detected	0 of 29	Within
Severn Water Company	none detected	none detected	0 of 29	Within
Solomons	none detected	none detected	0 of 29	Within
Stevensville	none detected	none detected	0 of 29	Within
The Provinces	none detected	none detected	0 of 29	Within
Town of Berlin	none detected	none detected	4 of 29	Within
Town of Centreville	none detected	none detected	0 of 29	Within
Town of Chesapeake Beach	none detected	none detected	0 of 29	Within
Town of Chestertown	none detected	none detected	0 of 29	Within
Town of Delmar	none detected	none detected	0 of 29	Within
Town of Denton	none detected	none detected	0 of 29	Within
Town of Hancock	none detected	none detected	0 of 29	Within
Town of Indian Head	none detected	none detected	0 of 29	Within
Town of la Plata	none detected	none detected	0 of 29	Within
Town of Millington	none detected	none detected	0 of 29	Within
Town of North East	none detected	none detected	1 of 29	Within
Town of Ocean City	none detected	none detected	0 of 29	Within
Town of Perryville	none detected	none detected	0 of 29	Within
Town of Princess Anne	none detected	none detected	0 of 29	Within
Town of Walkersville	none detected	none detected	0 of 29	Within
U.s. Naval Academy	none detected	none detected	0 of 29	Within
Waldorf - Charles County Dpw	none detected	none detected	3 of 29	Within
Washington Suburban Sanitary Commission	none detected	none detected	2 of 29	Within
Western Region Allegany Distrib. System	none detected	none detected	0 of 29	Within
White Plains 2 Mhp/jack Blair	none detected	none detected	0 of 29	Within

All 83 systems the EPA tested in Maryland, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →