Water quality for ZIP code 21161
Harford County, Maryland, one of 20 ZIP codes in the county. 237 active public water systems serve the county; 99 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Harford County
16 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Maryland American Water Company |
13,200 | 0 | 14.3 mi | |
| Queens Castle Mobile Home Park |
60 | 1 | 15.5 mi | |
| MD American Water Greenridge |
2,351 | 0 | 16.2 mi | |
| R & R Estates |
96 | 1 | 16.2 mi | |
| Campus Hills Water Works |
250 | 1 | 16.9 mi | |
| Darlington Mobile Home Park |
150 | 0 | 17.3 mi | |
| Clear View Mobile Home Park LLC |
28 | 1 | 17.4 mi | |
| MD American Water Lakeside Vista |
226 | 0 | 17.4 mi | |
| Fountain Green Mobile Home Park |
55 | 1 | 17.6 mi | |
| Harford County D.p.w. |
104,567 | 1 | 18.4 mi | |
| Town of Darlington |
250 | 0 | 19.4 mi | |
| Williams Mobile Home Park |
35 | 2 | 20.1 mi | |
| City of Aberdeen |
18,006 | 0 | 23.2 mi | |
| Swan Harbour Dell Mobile Home Park |
500 | 1 | 24.2 mi | |
| City of Havre de Grace |
14,000 | 3 | 25.3 mi | |
| Chapel Hill Aberdeen Proving Grounds |
15,000 | 0 | 26.2 mi |
Non-community systems in Harford County (220: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Harford 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 ZIP code EPA lists the system as serving, from Census Bureau ZCTA 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.