Virginia
Loudoun County drinking water quality
107 active public water systems serve 433,906 people in Loudoun County. 75 are compliant, 32 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Needs attention
Community water systems
19 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Loudoun Water Central System |
334,808 | 1 | 0 | |
|
Leesburg, Town of |
65,028 | 0 | 0 | |
|
Purcellville, Town of |
8,929 | 0 | 0 | |
|
Round Hill, Town of |
5,055 | 0 | 0 | |
|
Lovettsville, Town of |
2,964 | 0 | 0 | |
|
Hamilton, Town of |
2,240 | 0 | 0 | |
|
Selma Estates |
1,540 | 0 | 0 | |
|
Elysian Heights |
1,061 | 0 | 0 | |
|
Middleburg, Town of |
803 | 0 | 0 | |
|
Stoneleigh |
438 | 0 | 0 | |
|
Beacon Hill |
336 | 0 | 0 | |
|
Foxcroft School |
301 | 2 | 0 | |
|
Reserve at Rokeby Farm |
284 | 0 | 0 | |
|
North Spring Behavioral Healthcare |
225 | 0 | 0 | |
|
Creighton Farms |
95 | 0 | 0 | |
|
Hillsboro, Town of |
88 | 1 | 0 | |
|
Hiway MHC LLC |
80 | 1 | 0 | |
|
Aldie Water Company |
70 | 1 | 0 | |
|
One Stop Trailer Park |
60 | 0 | 0 |
Non-community systems (88: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (114, 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 Virginia 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.