Water quality for ZIP code 20628
St. Mary's County, Maryland, one of 26 ZIP codes in the county. 202 active public water systems serve the county; 46 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in St. Mary's County
37 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Lexington Estates |
300 | 0 | 6.6 mi | |
| Cook's Trailer Court (aka Garrett Tp) |
120 | 1 | 7.3 mi | |
| Fox Meadow |
128 | 1 | 7.7 mi | |
| Southgate |
188 | 1 | 7.9 mi | |
| Greenbrier |
1,161 | 1 | 8.2 mi | |
| Cedar Cove |
2,728 | 1 | 8.4 mi | |
| Piney Point |
672 | 1 | 9.2 mi | |
| Langley Mobile Home Park |
175 | 2 | 9.6 mi | |
| Patuxent Naval Air Station (navfac-Wash) |
22,000 | 1 | 9.9 mi | |
| Piney Point Landings |
239 | 1 | 10.5 mi | |
| Lord Calvert Trailer Park |
892 | 1 | 10.6 mi | |
| Hunting Quarters |
715 | 1 | 11.8 mi | |
| Lexington Park |
43,030 | 3 | 12.5 mi | |
| Leonardtown Farm |
193 | 1 | 15.1 mi | |
| Christmas Tree Farm Trailer Park |
100 | 3 | 15.8 mi | |
| Wilderness Run |
511 | 2 | 16.2 mi | |
| Forrest Farm Subdivision |
577 | 1 | 17.1 mi | |
| Fenwick Manor |
234 | 1 | 18.4 mi | |
| Mulberry South |
65 | 1 | 18.5 mi | |
| Town of Leonardtown |
5,000 | 1 | 19.2 mi | |
| Breton Bay |
1,012 | 2 | 19.4 mi | |
| Holland Forest |
139 | 1 | 19.4 mi | |
| Villages at Leonardtown |
239 | 1 | 21.3 mi | |
| St. Clements Shores |
620 | 1 | 21.7 mi | |
| King & Kennedy |
169 | 1 | 23.8 mi |
Non-community systems in St. Mary's County (164: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to St. Mary's 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.
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.