State
Maryland: drinking water records
EPA lists 464 community water systems serving homes in Maryland. 76 took part in EPA's national PFAS survey (UCMR 5), and 26 found at least one PFAS above the level laboratories can measure.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
PFAS in EPA’s final survey
26 of the 76 Maryland systems in EPA’s national PFAS survey found at least one PFAS, and 13 had a PFOA or PFOS yearly average at or above EPA’s limit. See Maryland’s PFAS results by system and compound.
Counties
- Allegany County 17 systems
- Anne Arundel County 28 systems
- Baltimore County 8 systems
- Baltimore city 5 systems
- Calvert County 30 systems
- Caroline County 19 systems
- Carroll County 24 systems
- Cecil County 47 systems
- Charles County 49 systems
- Dorchester County 12 systems
- Frederick County 30 systems
- Garrett County 16 systems
- Harford County 17 systems
- Howard County 4 systems
- Kent County 11 systems
- Montgomery County 6 systems
- Prince George's County 4 systems
- Queen Anne's County 16 systems
- Somerset County 10 systems
- St. Mary's County 38 systems
- Talbot County 8 systems
- Washington County 20 systems
- Wicomico County 26 systems
- Worcester County 19 systems
ZIP reports
Sources
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.