Water quality for ZIP code 21640
ZIP 21640 covers Henderson in Caroline County, Maryland, one of 8 ZIP codes in the county. 59 active public water systems serve the county; 17 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Caroline County
18 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Town of Henderson |
156 | 4 | 3.0 mi | |
| Cedar Mobile Home Park |
300 | 3 | 4.3 mi | |
| Harman Subdivision |
35 | 3 | 5.3 mi | |
| Benedictine School |
300 | 3 | 5.6 mi | |
| Town of Greensboro |
1,878 | 1 | 6.3 mi | |
| Taylors Mobile Home Park |
27 | 6 | 6.9 mi | |
| Town of Ridgely |
1,600 | 0 | 9.2 mi | |
| Tower Court Mobile Home Park |
40 | 1 | 11.4 mi | |
| Town of Denton |
4,848 | 0 | 12.9 mi | |
| Holly Cove Harbor Mobile Home Park |
45 | 2 | 21.5 mi | |
| Nelpine Mobile Home Park |
70 | 0 | 23.5 mi | |
| Dover Bridge Park |
100 | 3 | 23.7 mi | |
| Meadowbrook Court |
50 | 1 | 23.7 mi | |
| Jonestown Water System |
150 | 1 | 23.7 mi | |
| Dover Bridge II Mobile Home Park |
35 | 0 | 23.8 mi | |
| Town of Preston |
750 | 1 | 25.1 mi | |
| Liberty Mobile Home Park |
40 | 2 | 26.1 mi | |
| Town of Federalsburg |
2,450 | 1 | 26.1 mi |
Non-community systems in Caroline County (40: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Caroline 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.