County · Virginia
Loudoun County, Virginia: drinking water records
This overview covers 17 ZIP codes and 18 community water systems in Loudoun County. It also stands in for 3 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Loudoun Water - Central System VA6107350 | 334,808 | 240 | 1 | 0 | 0 ppb |
| Leesburg, Town of VA6107300 | 65,028 | 120 | 0 | 0 | 0 ppb |
| Purcellville, Town of VA6107600 | 8,929 | 480 | 8 | 0 | 0 ppb |
| Round Hill, Town of VA6107650 | 5,055 | 240 | 5 | 0 | 3.4 ppb |
| Hamilton, Town of VA6107150 | 2,240 | 120 | 5 | 0 | 0 ppb |
| Foxcroft School VA6107100 | 301 | 0 | 0 | 5 | 2.4 ppb |
| North Spring Behavioral Healthcare VA6107725 | 225 | 0 | 0 | 1 | 0 ppb |
| Lovettsville, Town of VA6107400 | 2,964 | 0 | 0 | 0 | 2.3 ppb |
| Selma Estates VA6107660 | 1,540 | 0 | 0 | 0 | 0 ppb |
| Elysian Heights VA6107555 | 1,061 | 0 | 0 | 0 | 0 ppb |
| Middleburg, Town of VA6107450 | 803 | 0 | 0 | 0 | 5.3 ppb |
| Stoneleigh VA6107700 | 438 | 0 | 0 | 0 | 9.2 ppb |
| Beacon Hill-Lcsa VA6107037 | 336 | 0 | 0 | 0 | 1 ppb |
| Reserve at Rokeby Farm VA6107651 | 284 | 0 | 0 | 0 | 0 ppb |
| Creighton Farms VA6107070 | 95 | 0 | 0 | 0 | 0 ppb |
| Hillsboro, Town of VA6107200 | 88 | 0 | 0 | 0 | 1.0 ppb |
| Aldie Water Company VA6107010 | 70 | 0 | 0 | 0 | 0 ppb |
| One Stop Trailer Park VA6107420 | 60 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Loudoun County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 20129, 20184, 20197.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.