Water quality for ZIP code 20678
ZIP 20678 covers Prince Frederick in Calvert County, Maryland, one of 12 ZIP codes in the 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 |
|---|---|---|---|---|
| Pine Trailer Park |
65 | 4 | 2.0 mi | |
| Calvert Mobile Home Park |
80 | 0 | 2.6 mi | |
| B&l Mobile Home Park |
65 | 2 | 2.8 mi | |
| Scientists Cliffs |
1,425 | 1 | 4.8 mi | |
| Hunting Hills |
124 | 0 | 4.8 mi | |
| The Calverton School |
461 | 3 | 4.8 mi | |
| Chesapeake Heights (bayside Forest) |
1,190 | 0 | 5.0 mi | |
| Kenwood Beach |
338 | 0 | 5.5 mi | |
| Western Shores |
200 | 1 | 5.9 mi | |
| Marley Run |
290 | 0 | 6.0 mi | |
| St. Leonard |
350 | 0 | 6.1 mi | |
| Calvert Beach Decatur Street |
350 | 1 | 6.8 mi | |
| Tara Subdivision |
68 | 0 | 6.9 mi | |
| Walnut Creek |
158 | 0 | 7.3 mi | |
| Calvert Beach / Forest Trail |
100 | 1 | 7.4 mi | |
| Beaches Water Co-Operative |
2,000 | 0 | 7.9 mi | |
| White Sands |
82 | 0 | 9.9 mi | |
| Tapestry North |
60 | 0 | 11.7 mi | |
| Town of Chesapeake Beach |
5,000 | 1 | 12.1 mi | |
| Summit/highlands |
1,108 | 0 | 12.8 mi | |
| Paris Oaks / Days End |
251 | 0 | 13.2 mi | |
| Town of North Beach |
3,000 | 2 | 13.3 mi | |
| Cross Point Subdivision |
434 | 0 | 13.3 mi | |
| Solomons |
3,811 | 0 | 14.9 mi | |
| Lakewood |
203 | 0 | 14.9 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, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.