FAIRFAX COUNTY WATER AUTHORITY
High Risk2 PFAS compound(s) exceed EPA Maximum Contaminant Levels
This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.
8
PFAS Detected
2
Above EPA Limits
54
ZIPs Served
Surface
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 7.40ppt | 185% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 5.70ppt | 143% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 21.50ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 17.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 17.10ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 10.10ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 8.10ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 5.60ppt | No federal limit | — | Unregulated |
ZIP Codes Served by This Utility
20120 20121 20124 20151 20153 20164 20170 20171 20190 20191 20192 20194 20195 22003 22015 22027 22030 22031 22032 22033 22035 22039 22041 22042 22043 22044 22046 22060 22066 22079 22101 22102 22122 22124 22150 22151 22152 22153 22180 22181 22182 22204 22206 22302 22303 22304 22306 22307 22308 22309 22310 22311 22312 22315
Click any ZIP to see the full result page for that area.
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
VA6059501
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor