Water quality for ZIP code 20166
ZIP 20166 covers Dulles Town Center, Ashburn, Arcola, Oak Grove, Loudoun Valley Estates, and Kincora in Loudoun County, Virginia, one of 17 ZIP codes in the county. 107 active public water systems serve the county; 32 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Loudoun County
18 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Creighton Farms |
95 | 0 | 8.4 mi | |
| Leesburg, Town of |
65,028 | 0 | 9.4 mi | |
| Reserve at Rokeby Farm |
284 | 0 | 9.8 mi | |
| Aldie Water Company |
70 | 1 | 10.2 mi | |
| Beacon Hill |
336 | 0 | 13.3 mi | |
| Selma Estates |
1,540 | 0 | 14.4 mi | |
| Middleburg, Town of |
803 | 0 | 15.5 mi | |
| Hamilton, Town of |
2,240 | 0 | 15.6 mi | |
| Hiway MHC LLC |
80 | 1 | 16.4 mi | |
| One Stop Trailer Park |
60 | 0 | 16.4 mi | |
| Foxcroft School |
301 | 2 | 17.1 mi | |
| Purcellville, Town of |
8,929 | 0 | 17.3 mi | |
| Elysian Heights |
1,061 | 0 | 18.1 mi | |
| Round Hill, Town of |
5,055 | 0 | 19.7 mi | |
| Hillsboro, Town of |
88 | 1 | 20.6 mi | |
| Lovettsville, Town of |
2,964 | 0 | 22.2 mi | |
| Stoneleigh |
438 | 0 | — | |
| North Spring Behavioral Healthcare |
225 | 0 | — |
Non-community systems in Loudoun County (88: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Loudoun 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 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.