Community Water System · PWS OR4100359
Corbett Water District
Operator location Corbett, Oregon - upper-third violation load (> 74 violations) with 146 EPA violations; surface water source; 2,954 served (PWS-level, not municipal population).
- 2,954
- People served (this PWS)
- 146
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Corbett Water District standing, high SDWIS violation third
146 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 7% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #10,791 of 29,740 among systems serving 500+.
The verdict
Corbett Water District sits in the upper third of the sitemap cohort by violation count (146), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,954 (mid served population (≤ 3,309)). Health-based share is 7% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #10,791 of 29,740
- Population · /systems
- #133 of 373
- Population · OR
- 146
- Total EPA violations on record
- 7%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,081
- County
- Multnomah
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 129
- Treatment Tech Violations
- 9
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 11 | 2012 |
| TTHM | MR | 10 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 10 | 2018 |
| Surface Water Treatment Rule | TT | 9 | 2010 |
| Surface Water Treatment Rule | MR | 8 | 2017 |
| Lead and Copper Rule | MR | 6 | 2025 |
| Nitrate | MR | 4 | 2017 |
| Interim Enhanced Surface Water Treatment Rule | MR | 3 | 2017 |
| Revised Total Coliform Rule | MON | 3 | 2016 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2008 |
| cis-1,2-Dichloroethylene | MR | 2 | 2008 |
| DICHLOROMETHANE | MR | 2 | 2008 |
| o-Dichlorobenzene | MR | 2 | 2008 |
| Vinyl chloride | MR | 2 | 2008 |
| 1,1-Dichloroethylene | MR | 2 | 2008 |
| 1,2-Dichloroethane | MR | 2 | 2008 |
| 1,1,1-Trichloroethane | MR | 2 | 2008 |
| Carbon tetrachloride | MR | 2 | 2008 |
| 1,2-Dichloropropane | MR | 2 | 2008 |
| 1,1,2-Trichloroethane | MR | 2 | 2008 |
| Tetrachloroethylene | MR | 2 | 2008 |
| Benzene | MR | 2 | 2008 |
| Toluene | MR | 2 | 2008 |
| Ethylbenzene | MR | 2 | 2008 |
| Styrene | MR | 2 | 2008 |
| Arsenic | MR | 2 | 2007 |
| p-Dichlorobenzene | MR | 2 | 2008 |
| Xylenes, Total | MR | 2 | 2008 |
| Trichloroethylene | MR | 2 | 2008 |
| trans-1,2-Dichloroethylene | MR | 2 | 2008 |
Violation Count vs. the National Corpus
Corbett Water District has 146 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 19% carry more. 7% of this system's own violations are health-based (10 of 146), and it ranks #10,791 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
146 Higher than most more violations than 81% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 87 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFEESA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 8/12/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 8/12/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/12/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 8/12/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/12/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/12/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/12/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/12/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/12/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/12/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/12/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/12/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/12/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 5/27/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 5/27/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpS | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 5/27/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 5/27/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 5/27/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 5/27/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 5/27/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 5/27/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 5/27/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/27/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/27/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/27/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/27/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
SDWIS compliance record for Corbett Water District
146 violations on record for OR4100359; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
146 violations · 2,954 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Corbett Water District
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Oregon compares on the same EPA violation measures. Oregon systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.