Water quality in Upper Marlboro, Maryland
Upper Marlboro is in Calvert County. 226 active public water systems serve the county; 49 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Calvert County
29 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Regency Manor Mobile Home Park |
224 | 3 | 5.0 mi | |
| Cavalier Country |
381 | 0 | 5.2 mi | |
| Lakewood |
203 | 0 | 5.3 mi | |
| Cross Point Subdivision |
434 | 0 | 7.5 mi | |
| Tapestry North |
60 | 0 | 8.4 mi | |
| Paris Oaks / Days End |
251 | 0 | 9.3 mi | |
| Summit/highlands |
1,108 | 0 | 10.4 mi | |
| Town of North Beach |
3,000 | 2 | 10.9 mi | |
| Town of Chesapeake Beach |
5,000 | 1 | 11.2 mi | |
| Walnut Creek |
158 | 0 | 12.9 mi | |
| Tara Subdivision |
68 | 0 | 13.4 mi | |
| Marley Run |
290 | 0 | 14.5 mi | |
| Hunting Hills |
124 | 0 | 15.3 mi | |
| The Calverton School |
461 | 3 | 15.4 mi | |
| B&l Mobile Home Park |
65 | 2 | 17.3 mi | |
| Chesapeake Heights (bayside Forest) |
1,190 | 0 | 18.7 mi | |
| Prince Frederick |
4,371 | 1 | 18.7 mi | |
| Calvert Mobile Home Park |
80 | 0 | 20.8 mi | |
| Pine Trailer Park |
65 | 4 | 21.3 mi | |
| Scientists Cliffs |
1,425 | 1 | 22.3 mi | |
| Kenwood Beach |
338 | 0 | 23.6 mi | |
| Western Shores |
200 | 1 | 24.1 mi | |
| St. Leonard |
350 | 0 | 25.0 mi | |
| Calvert Beach Decatur Street |
350 | 1 | 25.4 mi | |
| Calvert Beach / Forest Trail |
100 | 1 | 25.9 mi |
Non-community systems in Calvert County (196: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Calvert County, nearest to Upper Marlboro first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Maryland records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.