EPA UCMR 5 results for 83 public water systems. 30 had at least one PFAS detected; 16 had a highest single PFOA or PFOS result above 4.0 ppt.
UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.
| Water system | Serves | PFOA max (ppt) | PFOS max (ppt) | PFAS detected |
|---|---|---|---|---|
| Boonsboro - Keedysville MD0210002 | Washington County | 6.7 | ND | 5 |
| Broad Creek MD0020004 | Anne Arundel County | ND | ND | 0 |
| Bryans Road MD0080033 | Charles County | ND | ND | 0 |
| Chapel Hill - Aberdeen Proving Grounds MD0120002 | Harford County | ND | ND | 0 |
| Charlotte Hall VA Home MD0180217 | St. Mary's County | ND | ND | 0 |
| Chesapeake Complex MD1020003 | Anne Arundel County | ND | ND | 0 |
| Chesapeake Ranch Estates MD0040004 | Calvert County | ND | ND | 0 |
| City of Aberdeen MD0120001 | Harford County | 7.6 | 8.6 | 8 |
| City of Annapolis MD0020001 | Anne Arundel County | ND | ND | 0 |
| City of Baltimore MD0300002 | Baltimore city County | ND | ND | 1 |
| City of Bowie, MD MD0160002 | Prince George's County | ND | ND | 0 |
| City of Brunswick MD0100005 | Frederick County | ND | ND | 0 |
| City of Cambridge MD0090002 | Dorchester County | ND | ND | 0 |
| City of Cumberland MD0010008 | Allegany County | ND | ND | 0 |
| City of Frederick MD0100015 | Frederick County | ND | ND | 1 |
| City of Frostburg MD0010011 | Allegany County | ND | ND | 0 |
| City of Fruitland MD0220008 | Wicomico County | ND | 4.1 | 2 |
| City of Hagerstown MD0210010 | Washington County | ND | ND | 0 |
| City of Havre De Grace MD0120012 | Harford County | ND | ND | 0 |
| City of Pocomoke City MD0230006 | Worcester County | ND | ND | 0 |
| City of Rockville MD0150003 | Montgomery County | ND | ND | 4 |
| City of Salisbury MD0220004 | Wicomico County | 5.9 | 20 | 6 |
| City of Taneytown MD0060012 | Carroll County | 4.6 | 10.7 | 6 |
| City of Westminster, MD MD0060015 | Carroll County | 12.4 | 6.9 | 8 |
| Crofton-Odenton MD0020008 | Anne Arundel County | ND | ND | 0 |
| Eastern Correctional Institute MD0190013 | Somerset County | ND | ND | 0 |
| Eastern Region Allegany Distrib. System MD0010005 | Allegany County | ND | ND | 0 |
| Easton Utilities MD0200003 | Talbot County | ND | ND | 0 |
| Elkton West MD0070015 | Cecil County | ND | ND | 0 |
| Fort Detrick MD0100011 | Frederick County | ND | ND | 1 |
| Fort George G. Meade MD0020012 | Anne Arundel County | ND | ND | 0 |
| Freedom District MD0060002 | Carroll County | ND | ND | 2 |
| Glen Burnie-Broadneck MD0020017 | Anne Arundel County | ND | ND | 0 |
| Glenelg Country School MD1130003 | Howard County | 10 | ND | 7 |
| Harford County D.P.W. MD0120016 | Harford County | ND | ND | 0 |
| Howard County D.P.W. Distribution MD0130002 | Howard County | ND | ND | 2 |
| Lavale Sanitary Commission MD0010016 | Allegany County | ND | ND | 0 |
| Lexington Park MD0180007 | St. Mary's County | ND | ND | 0 |
| MGM National Harbor MD1160049 | Prince George's County | ND | ND | 1 |
| Manor Shopping Center MD1030054 | Baltimore County | ND | ND | 1 |
| Maryland American Water Company MD0120003 | Harford County | 9.3 | 9.1 | 9 |
| Midland-Lonaconing MD0010018 | Allegany County | ND | ND | 0 |
| Mystic Harbour MD0230011 | Worcester County | ND | ND | 0 |
| Naval Support Facility, Indian Head MD0080058 | Charles County | ND | ND | 0 |
| New Design - Frederick County MD0100030 | Frederick County | ND | ND | 1 |
| New Life Christian School MD1100052 | Frederick County | 10.1 | 15.3 | 7 |
| Oakville Elementary School MD1180037 | St. Mary's County | ND | ND | 0 |
| Ocean Pines MD0230005 | Worcester County | ND | ND | 2 |
| Patuxent Naval Air Station (Navfac-Wash) MD0180022 | St. Mary's County | ND | ND | 0 |
| Penn-Mar Organization, Inc. MD1030058 | Baltimore County | ND | ND | 0 |
| Piney Point MD0180034 | St. Mary's County | ND | ND | 0 |
| Prince Frederick MD0040011 | Calvert County | ND | ND | 0 |
| Severn Water Company MD0020027 | Anne Arundel County | ND | ND | 0 |
| Solomons MD0040027 | Calvert County | ND | ND | 0 |
| Stevensville MD0170019 | Queen Anne's County | ND | ND | 0 |
| The Provinces MD0020029 | Anne Arundel County | ND | ND | 0 |
| Town of Berlin MD0230001 | Worcester County | ND | ND | 4 |
| Town of Centreville MD0170001 | Queen Anne's County | ND | ND | 0 |
| Town of Chesapeake Beach MD0040003 | Calvert County | ND | ND | 0 |
| Town of Chestertown MD0140002 | Kent County | ND | ND | 0 |
| Town of Delmar MD0220001 | Wicomico County | ND | ND | 0 |
| Town of Denton MD0050001 | Caroline County | ND | ND | 0 |
| Town of Elkton MD0070011 | Cecil County | 23.3 | 7.1 | 8 |
| Town of Hampstead MD0060003 | Carroll County | 9.1 | 5.7 | 8 |
| Town of Hancock MD0210012 | Washington County | ND | ND | 0 |
| Town of Indian Head MD0080020 | Charles County | ND | ND | 0 |
| Town of La Plata MD0080025 | Charles County | ND | ND | 0 |
| Town of Manchester MD0060006 | Carroll County | 4.7 | ND | 6 |
| Town of Middletown MD0100018 | Frederick County | 4.9 | 6.7 | 8 |
| Town of Millington MD0140010 | Kent County | ND | ND | 0 |
| Town of Mount Airy MD0060007 | Carroll County | 12.7 | 6 | 7 |
| Town of North East MD0070016 | Cecil County | ND | ND | 1 |
| Town of Ocean City MD0230003 | Worcester County | ND | ND | 0 |
| Town of Perryville MD0070018 | Cecil County | ND | ND | 0 |
| Town of Poolesville MD0150002 | Montgomery County | 5.4 | 6.5 | 8 |
| Town of Princess Anne MD0190002 | Somerset County | ND | ND | 0 |
| Town of Thurmont MD0100023 | Frederick County | 15 | 48 | 4 |
| Town of Walkersville MD0100025 | Frederick County | ND | ND | 0 |
| U.S. Naval Academy MD0020042 | Anne Arundel County | ND | ND | 0 |
| Waldorf - Charles County DPW MD0080049 | Charles County | ND | ND | 3 |
| Washington Suburban Sanitary Commission MD0150005 | Montgomery County | ND | ND | 2 |
| Western Region Allegany Distrib. System MD0010009 | Allegany County | ND | ND | 0 |
| White Plains 2 Mhp/Jack Blair MD0080208 | Charles County | ND | ND | 0 |
ND = not detected (below the 4 ppt UCMR 5 reporting level). Values are the highest single sample result, not an annual average.