Maryland public water systems
2,992 active systems regulated under the Safe Drinking Water Act, serving a reported 5.8M people across 60 counties.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
2,992
Population served
5.8M
Community systems
422
Groundwater share
97.3%
System types in Maryland
422
Community water system
491
Non-transient non-community water system
2,079
Transient non-community water system
Largest water systems in Maryland
🔒 Create a free account to export CSV| # | 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 | New Design - Frederick County | Frederick | 74,911 | Community | Surface water |
| 8 | Crofton-Odenton | Anne Arundel | 62,986 | Community | Groundwater |
| 9 | Fort George G. Meade | Anne Arundel | 62,234 | Community | Groundwater |
| 10 | City of Frederick | Frederick | 54,000 | Community | Surface water |
| 11 | Lexington Park | St. Mary's | 43,030 | Community | Groundwater |
| 12 | City of Westminster | Carroll | 35,256 | Community | Surface water |
| 13 | City of Annapolis | Anne Arundel | 35,000 | Community | Groundwater |
| 14 | City of Salisbury | Wicomico | 30,343 | Community | Groundwater |
| 15 | Town of Ocean City | Worcester | 30,000 | Community | Groundwater |
| 16 | City of Cumberland | Allegany | 27,039 | Community | Surface water |
| 17 | Broad Creek | Anne Arundel | 26,033 | Community | Groundwater |
| 18 | City of Bowie | Prince George's | 25,000 | Community | Groundwater |
| 19 | Freedom District | Carroll | 24,867 | Community | Surface water |
| 20 | Patuxent Naval Air Station (Navfac-Wash) | St. Mary's | 22,000 | Community | Groundwater |
| 21 | City of Aberdeen | Harford | 18,006 | Community | Purchased surface water |
| 22 | Easton Utilities | Talbot | 17,357 | Community | Groundwater |
| 23 | Town of Elkton | Cecil | 15,625 | Community | Surface water |
| 24 | City of Cambridge Water | Dorchester | 15,000 | Community | Groundwater |
| 25 | Chapel Hill - Aberdeen Proving Grounds | Harford | 15,000 | Community | Groundwater |
By county
Anne Arundel405 systemsBaltimore272 systemsHarford226 systemsFrederick211 systemsCarroll208 systemsCalvert203 systemsSt. Mary's194 systemsCecil166 systemsCharles134 systemsWorcester120 systemsQueen Anne's92 systemsHoward87 systemsWicomico85 systemsWashington78 systemsDorchester70 systemsGarrett67 systemsAllegany53 systemsCaroline51 systemsKent51 systemsMontgomery49 systemsTalbot41 systemsPrince George's31 systemsSomerset29 systemsBaltimore city12 systemsBedford4 systemsLancaster4 systemsChester3 systems
Lenawee2 systems
Mecosta2 systems
Van Buren2 systems
Sanilac2 systems
Berks2 systems
Fulton2 systems
Crawford2 systems
Adams2 systems
Fauquier2 systems
Stafford2 systems
Allegan1 systems
Ionia1 systems
Tuscola1 systems
Clare1 systems
Mahoning1 systems
Summit1 systems
Monroe1 systems
Wyoming1 systems
Huntingdon1 systems
Lycoming1 systems
York1 systems
Victoria1 systems
Williamson1 systems
Salt Lake1 systems
Page1 systems
Warren1 systems
Accomack1 systems
James City1 systems
Mathews1 systems
Culpeper1 systems
Fairfax1 systems
King George1 systems
Prince William1 systems