CITY OF HILLSBORO
High Risk1 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.
6
PFAS Detected
1
Above EPA Limits
1
ZIP Served
Surface
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 4.50ppt | 113% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 12.90ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 10.70ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 9.10ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 5.70ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.40ppt | No federal limit | — | Unregulated |
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
TX1090001
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor