ZIP Code 20120
High RiskPFAS above EPA limits detected
2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
9
PFAS Detected
2
Above EPA Limits
2
Water Systems
185%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 185% of limit
Detected: 7.40 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 143% of limit
Detected: 5.70 ppt
FAIRFAX COUNTY WATER AUTHORITY
VA6059501 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
2
State
Virginia
Data Period
2023–2025
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 |
LOUDOUN WATER - CENTRAL SYSTEM
VA6107350 Low LevelWater Type
Surface Water
PFAS Detected
1
Above MCL
0
State
Virginia
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFPeA Perfluoropentanoic acid | 3.40ppt | No federal limit | — | Unregulated |
Note: ZIP code 20120 is served by 2 separate water utilities.
Results above show data for each system independently.
Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.
UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.
Detection values represent the highest single-sample result measured at entry points to the distribution system.