County · Virginia
Fairfax County, Virginia: drinking water records
This overview covers 43 ZIP codes and 5 community water systems in Fairfax County. It also stands in for 0 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 |
|---|---|---|---|---|---|
| Fairfax County Water Authority VA6059501 | 1,121,613 | 720 | 8 | 0 | 1.2 ppb |
| Fort Belvoir VA6059450 | 39,303 | 120 | 7 | 0 | 0.2 ppb |
| Vienna, Town of VA6059800 | 27,134 | 120 | 2 | 0 | 0.6 ppb |
| Herndon, Town of VA6059550 | 24,601 | 120 | 3 | 0 | 0.4 ppb |
| Tauxemont VA6059750 | 250 | 0 | 0 | 0 | 1 ppb |
ZIP reports in Fairfax County
No ZIP report in this county is published yet.
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.