Water quality for ZIP code 20630
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 |
|---|---|---|---|---|
| Piney Point Landings |
239 | 1 | 2.8 mi | |
| Saint Marys College |
2,200 | 1 | 3.7 mi | |
| Langley Mobile Home Park |
175 | 2 | 4.7 mi | |
| Cook's Trailer Court (aka Garrett Tp) |
120 | 1 | 4.8 mi | |
| Fox Meadow |
128 | 1 | 4.8 mi | |
| Greenbrier |
1,161 | 1 | 5.9 mi | |
| Lord Calvert Trailer Park |
892 | 1 | 6.0 mi | |
| Hunting Quarters |
715 | 1 | 6.2 mi | |
| Lexington Estates |
300 | 0 | 6.3 mi | |
| Southgate |
188 | 1 | 6.7 mi | |
| Cedar Cove |
2,728 | 1 | 7.9 mi | |
| Lexington Park |
43,030 | 3 | 8.6 mi | |
| Leonardtown Farm |
193 | 1 | 8.7 mi | |
| Patuxent Naval Air Station (navfac-Wash) |
22,000 | 1 | 8.9 mi | |
| Wilderness Run |
511 | 2 | 9.4 mi | |
| Christmas Tree Farm Trailer Park |
100 | 3 | 9.8 mi | |
| Forrest Farm Subdivision |
577 | 1 | 11.7 mi | |
| Mulberry South |
65 | 1 | 11.7 mi | |
| Breton Bay |
1,012 | 2 | 12.5 mi | |
| Town of Leonardtown |
5,000 | 1 | 13.0 mi | |
| Holland Forest |
139 | 1 | 13.7 mi | |
| Fenwick Manor |
234 | 1 | 14.1 mi | |
| St. Clements Shores |
620 | 1 | 14.7 mi | |
| Villages at Leonardtown |
239 | 1 | 15.0 mi | |
| Mount Pleasant Water Co., Inc. |
150 | 2 | 17.3 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.