Maryland
Harford County drinking water quality
237 active public water systems serve 217,710 people in Harford County. 138 are compliant, 99 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
17 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Harford County D.p.w. |
104,567 | 1 | 0 | |
|
City of Aberdeen |
18,006 | 0 | 0 | |
|
Chapel Hill Aberdeen Proving Grounds |
15,000 | 0 | 0 | |
|
City of Havre de Grace |
14,000 | 3 | 0 | |
|
Maryland American Water Company |
13,200 | 0 | 0 | |
|
MD American Water Greenridge |
2,351 | 0 | 0 | |
|
Swan Harbour Dell Mobile Home Park |
500 | 1 | 0 | |
|
Campus Hills Water Works |
250 | 1 | 0 | |
|
Town of Darlington |
250 | 0 | 0 | |
|
MD American Water Lakeside Vista |
226 | 0 | 0 | |
|
Darlington Mobile Home Park |
150 | 0 | 0 | |
|
R & R Estates |
96 | 1 | 0 | |
|
Queens Castle Mobile Home Park |
60 | 1 | 0 | |
|
Fountain Green Mobile Home Park |
55 | 1 | 0 | |
|
Hart Heritage |
37 | 1 | 0 | |
|
Williams Mobile Home Park |
35 | 2 | 0 | |
|
Clear View Mobile Home Park LLC |
28 | 1 | 0 |
Non-community systems (220: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (184, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.