Maryland tap water

State answer

13 of 76 Maryland water systems with full PFAS testing (17%) averaged above a 2024 federal PFAS level at one or more sampling points.

460 active community water systems in the EPA file; 71 serve 3,300+ people and have a full PFAS set.
135 systems had at least one health-based violation since 2021-10-26.
3 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).

Largest systems

System	People served	PFAS above a 2024 level?	Health-based violations since 2021-10-26
Washington Suburban Sanitary Commission	1,900,000	No	0
City of Baltimore	1,600,000	No	3
Glen Burnie-Broadneck	290,606	No	0
Howard County D.p.w. Distribution	286,158	No	0
Harford County D.p.w.	104,567	No	0
City of Hagerstown	92,200	No	0
Waldorf - Charles County Dpw	84,296	No	0
New Design - Frederick County	74,911	No	0

All 13 utilities with a page in Maryland

City of Baltimore 1,600,000
City of Frederick 54,000
City of Hagerstown 92,200
City of Rockville 52,000
Crofton-Odenton 62,986
Fort George G. Meade 62,234
Glen Burnie-Broadneck 290,606
Harford County D.p.w. 104,567
Howard County D.p.w. Distribution 286,158
Lexington Park 43,030
New Design - Frederick County 74,911
Waldorf - Charles County Dpw 84,296
Washington Suburban Sanitary Commission 1,900,000

Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.

Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.

Sources and freshness

Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.