Maryland public water systems
3,074 active systems regulated under the Safe Drinking Water Act, serving a reported 6M people across 60 counties.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
3,074
Population served
6M
Community systems
442
Groundwater share
97.2%
System types in Maryland
442
Community water system
516
Non-transient non-community water system
2,116
Transient non-community water system
Largest water systems in Maryland
| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Washington Suburban Sanitary Commission | Montgomery | 1,900,000 | Community | Surface water |
| 2 | City of Baltimore | Baltimore city | 1,600,000 | Community | Surface water |
| 3 | Glen Burnie-Broadneck | Anne Arundel | 290,606 | Community | Groundwater |
| 4 | Howard County D.P.W. Distribution | Howard | 286,158 | Community | Purchased surface water |
| 5 | Harford County D.P.W. | Harford | 104,567 | Community | Surface water |
| 6 | City of Hagerstown | Washington | 92,200 | Community | Surface water |
| 7 | Waldorf - Charles County Dpw | Charles | 84,296 | Community | Purchased surface water |
| 8 | New Design - Frederick County | Frederick | 74,911 | Community | Surface water |
| 9 | Crofton-Odenton | Anne Arundel | 62,986 | Community | Groundwater |
| 10 | Fort George G. Meade | Anne Arundel | 62,234 | Community | Groundwater |
| 11 | City of Frederick | Frederick | 54,000 | Community | Surface water |
| 12 | Lexington Park | St. Mary's | 43,030 | Community | Groundwater |
| 13 | City of Westminster | Carroll | 35,256 | Community | Surface water |
| 14 | City of Annapolis | Anne Arundel | 35,000 | Community | Groundwater |
| 15 | City of Salisbury | Wicomico | 30,343 | Community | Groundwater |
| 16 | Town of Ocean City | Worcester | 30,000 | Community | Groundwater |
| 17 | City of Cumberland | Allegany | 27,039 | Community | Surface water |
| 18 | Broad Creek | Anne Arundel | 26,033 | Community | Groundwater |
| 19 | City of Bowie | Prince George's | 25,000 | Community | Groundwater |
| 20 | Freedom District | Carroll | 24,867 | Community | Surface water |
| 21 | Patuxent Naval Air Station (Navfac-Wash) | St. Mary's | 22,000 | Community | Groundwater |
| 22 | City of Aberdeen | Harford | 18,006 | Community | Purchased surface water |
| 23 | Easton Utilities | Talbot | 17,357 | Community | Groundwater |
| 24 | Town of Elkton | Cecil | 15,625 | Community | Surface water |
| 25 | City of Cambridge Water | Dorchester | 15,000 | Community | Groundwater |
By county
Anne Arundel410 systemsBaltimore272 systemsHarford231 systemsCalvert220 systemsCarroll215 systemsFrederick212 systemsSt. Mary's196 systemsCecil167 systemsCharles159 systemsWorcester120 systemsQueen Anne's92 systemsWicomico89 systemsHoward86 systemsWashington79 systemsGarrett71 systemsDorchester68 systemsCaroline55 systemsAllegany55 systemsKent51 systemsMontgomery50 systemsTalbot40 systemsPrince George's35 systemsSomerset31 systemsBaltimore city13 systemsBedford4 systemsLancaster4 systemsChester3 systems
Fauquier2 systems
Adams2 systems
Crawford2 systems
Berks2 systems
Fulton2 systems
Mecosta2 systems
Van Buren2 systems
Stafford2 systems
Lenawee2 systems
Sanilac2 systems
Fairfax1 systems
Lycoming1 systems
Huntingdon1 systems
Wyoming1 systems
Northampton1 systems
Monroe1 systems
Mathews1 systems
Warren1 systems
King George1 systems
Accomack1 systems
York1 systems
Salt Lake1 systems
Prince William1 systems
Ionia1 systems
Allegan1 systems
Williamson1 systems
Victoria1 systems
Clare1 systems
James City1 systems
Summit1 systems
Mahoning1 systems
Tuscola1 systems
Culpeper1 systems