Oregon PFAS results from EPA's final data
Report published Nov 14, 2026 · EPA UCMR 5 final data file of Oct 15, 2026 (samples collected 2023–2025) · Method · National results →
9 Oregon water systems serving 226,133 people had PFAS above a 2024 federal limit in EPA's final round of nationwide PFAS testing: 7% of the 123 Oregon systems tested, compared with 11% nationally.
Highest PFOA or PFOS averages in Oregon
- City of Hermiston Hermiston · PFOS8.6 ppt
- Rainbow Water District Springfield · PFOS7.75 ppt
- Klamath Falls Water Dept Klamath Falls · PFOS7.1 ppt
- City of Milton-Freewater Milton-Freewater · PFOS7.1 ppt
- City of Milwaukie Milwaukie · PFOS6.65 ppt
- Marcola Water District Springfield · PFOS6.25 ppt
- City of Bend Bend · PFOA5.95 ppt
- City of Dundee Dundee · PFOS4.8 ppt
- Sunrise Water Authority Happy Valley · PFOS4.3 ppt
- Springfield Utility Board Springfield · PFOA2.05 ppt
Chart data as a table
| System | ppt |
|---|---|
| City of Hermiston · Hermiston · PFOS | 8.6 |
| Rainbow Water District · Springfield · PFOS | 7.75 |
| Klamath Falls Water Dept · Klamath Falls · PFOS | 7.1 |
| City of Milton-Freewater · Milton-Freewater · PFOS | 7.1 |
| City of Milwaukie · Milwaukie · PFOS | 6.65 |
| Marcola Water District · Springfield · PFOS | 6.25 |
| City of Bend · Bend · PFOA | 5.95 |
| City of Dundee · Dundee · PFOS | 4.8 |
| Sunrise Water Authority · Happy Valley · PFOS | 4.3 |
| Springfield Utility Board · Springfield · PFOA | 2.05 |
Largest systems above a limit
| # | System | People served |
|---|---|---|
| 1 | City of Bend Bend Above: PFOA | 77,704 |
| 2 | Sunrise Water Authority Happy Valley Above: PFOS | 50,003 |
| 3 | Klamath Falls Water Dept Klamath Falls Above: PFOS | 40,475 |
| 4 | City of Milwaukie Milwaukie Above: PFOS | 20,946 |
| 5 | City of Hermiston Hermiston Above: PFOS | 20,000 |
| 6 | City of Milton-Freewater Milton-Freewater Above: PFOS | 7,145 |
| 7 | Rainbow Water District Springfield Above: PFOS | 6,300 |
| 8 | City of Dundee Dundee Above: PFOS | 2,960 |
| 9 | Marcola Water District Springfield Above: PFOS | 600 |
Which limits were exceeded
| PFAS | Federal limit | Systems above it |
|---|---|---|
| PFOA 77,704 people | 4 ppt | 1 |
| PFOS 148,429 people | 4 ppt | 8 |
| PFHxS | 10 ppt | 0 |
| PFNA | 10 ppt | 0 |
| GenX (HFPO-DA) | 10 ppt | 0 |
| Hazard Index | 1 | 0 |
"–" in the table above means not detected. A system can be above more than one limit. EPA proposed in May 2026 to rescind the PFHxS, PFNA, GenX and Hazard Index limits. That proposal is not final.
Data and how to cite it
- Download every Oregon water system as CSV (PFOA and PFOS averages, systems above a limit, lead, violations).
- EPA's source file: UCMR 5 occurrence data.
Suggested citation:
Tap Water Results, "Oregon PFAS results from EPA's final UCMR 5 data" (published Nov 14, 2026, EPA data file of Oct 15, 2026). https://tapwaterresults.com/pfas/oregon/
You're welcome to quote and republish these figures with a link back. Questions from reporters: see contact.
Method
For each system we average each entry point's UCMR 5 results (non-detects count as zero, complete sets of samples only) and compare the highest entry-point average with the 2024 federal limit, using EPA's rounding. This is how EPA compares UCMR 5 results to the limits in its own data summary, and our national counts match EPA's published table within 2% (how we check). Results are monitoring data from 2023–2025, not compliance determinations, and treatment installed since then is not reflected. Full method.
Questions
How many Oregon water systems have PFAS above the limit?
9 of the 123 Oregon community water systems EPA tested in 2023–2025 (7%) had at least one entry-point average above a 2024 federal PFAS limit. They serve 226,133 people. Nationally the share is 11%.
Are these systems violating the law?
Not yet. Systems have until 2029 to meet the 2024 limits, and EPA has proposed moving the PFOA and PFOS deadline to 2031 and rescinding the other limits. EPA's UCMR 5 results are monitoring data and do not determine compliance.
Which systems were tested?
EPA's UCMR 5 tested every community water system serving more than 3,300 people and a representative sample of smaller ones. Systems that were not tested have no federal result, which is not the same as having no PFAS.
All Oregon water systems → · National results → · PFAS results for every state →
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.