Maryland tap water, by utility.

79 utilities with a full report, serving 5.3 million people as they report it. Regulated PFAS turned up at 18 of them.

Maryland utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Washington Suburban Sanitary Commission	Laurel	1,900,000	None found	0
City of Baltimore	Baltimore	1,600,000	None found	3
Glen Burnie - Broadneck	Millersville	290,606	None found	0
Howard County D.P.W. Distribution	Columbia	286,158	None found	0
Harford County D.P.W.	Abingdon	104,567	None found	0
City of Hagerstown	Hagerstown	92,200	None found	0
Waldorf - Charles County DPW		84,296	PFBS	0
New Design - Frederick County	Frederick	74,911	None found	0
Crofton - Odenton	Millersville	62,986	None found	0
Fort George G. Meade	Fort Meade	62,234	None found	0
City of Frederick	Frederick	54,000	None found	0
City of Rockville		52,000	PFBS	0
Lexington Park	California	43,030	None found	0
City of Westminster	Westminster	35,256	PFOA, PFOS, PFHxS, PFBS	4
City of Annapolis	Annapolis	35,000	None found	0
City of Salisbury	Salisbury	30,343	PFOA, PFOS, PFHxS, PFBS	0
Town of Ocean City	Ocean City	30,000	None found	1
City of Cumberland	Cumberland	27,039	None found	0
Broad Creek	Millersville	26,033	None found	0
City of Bowie	Bowie	25,000	None found	1
Freedom District	Westminster	24,867	None found	6
Patuxent Naval Air Station (Navfac - Wash)	Patuxent River	22,000	None found	0
City of Aberdeen	Aberdeen	18,006	PFOA, PFOS, PFHxS, PFBS	0
Easton Utilities	Easton	17,357	None found	0
Town of Elkton	Elkton	15,625	PFOA, PFOS, PFHxS, PFBS	2
City of Cambridge Water	Cambridge	15,000	None found	0
Chapel Hill - Aberdeen Proving Grounds	Aberdeen	15,000	None found	0
City of Havre de Grace	Havre de Grace	14,000	None found	5
Maryland American Water Company	Bel Air	13,200	PFOA, PFOS, PFHxS, PFBS	0
Ocean Pines	Berlin	11,890	PFBS	0
Town of la Plata	La Plata	11,535	None found	0
City of Frostburg	Frostburg	11,000	None found	0
Town of Mount Airy	Mount Airy	9,890	PFOA, PFOS, PFBS	0
Chesapeake Ranch Estates	Lusby	9,500	None found	0
Stevensville	Stevensville	9,155	None found	0
U.S. Naval Academy	Annapolis	8,700	None found	0
Town of North East	North East	8,600	None found	13
Town of Walkersville	Walkersville	8,440	None found	0
Fort Detrick	Frederick	7,900	None found	3
City of Brunswick	Brunswick	7,312	None found	0
City of Taneytown	Taneytown	6,750	PFOA, PFOS, PFHxS, PFBS	0
Town of Hampstead	Hampstead	6,600	PFOA, PFOS, PFHxS, PFBS	0
Bryans Road		6,260	None found	0
Town of Thurmont	Thurmont	6,200	PFOA, PFOS, PFHxS, PFBS	0
Town of Poolesville	Poolesville	6,005	PFOA, PFOS, PFHxS, PFBS	0
Mystic Harbour	Berlin	5,945	None found	0
City of Fruitland	Fruitland	5,907	PFOS, PFHxS	0
Eastern Region Allegany Distrib. System	Cumberland	5,703	None found	0
Deep Creek Lake Water Service Area		5,502	Not sampled	0
Lavale Sanitary Commission	Lavale	5,500	None found	0
Maryland American Water - - Severn System	Bel Air	5,447	None found	0
Town of Chestertown	Chestertown	5,400	None found	1
Town of Leonardtown	Leonardtown	5,000	Not sampled	1
Midland - Lonaconing	Lonaconing	5,000	None found	2
Town of Chesapeake Beach	Chesapeake Beach	5,000	None found	0
Western Region Allegany Distrib. System	Cumberland	4,955	None found	0
Town of Manchester	Manchester	4,954	PFOA, PFHxS, PFBS	0
Town of Berlin	Berlin	4,500	PFHxS	0
Town of Delmar	Delmar	4,500	None found	0
Town of Denton	Denton	4,500	None found	0
Town of Perryville	Perryville	4,413	None found	12
Prince Frederick	Prince Frederick	4,371	None found	0
Town of Middletown	Middletown	4,288	PFOA, PFOS, PFHxS, PFBS	0
Boonsboro - Keedysville	Boonsboro	4,250	PFOA, PFHxS, PFBS	0
City of Pocomoke City	Pocomoke City	4,100	None found	9
Town of Indian Head	Indian Head	4,100	None found	0
The Provinces	Dunkirk	3,991	None found	0
Solomons	Prince Frederick	3,811	None found	0
Town of Charlestown	Willards	3,791	Not sampled	1
Eastern Correctional Institute		3,500	None found	1
Elkton West	Newark	3,500	None found	1
Town of Centreville	Centreville	3,322	None found	1
Naval Support Facility, Indian Head	Indian Head	3,321	None found	0
Town of Princess Anne	Princess Anne	3,300	None found	1
Town of Hancock	Hancock	1,921	None found	0
Piney Point	California	672	None found	0
Town of Millington	Millington	625	None found	0
Charlotte Hall VA Home		270	None found	1
White Plains 2 Mhp/Jack Blair	Jessup	70	None found	0
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.