PENDLETON, CITY OF
PWS ID: OR4100613 · PENDLETON, Oregon 97801
PENDLETON, CITY OF serves 16,996 people in PENDLETON, Oregon using Surface Water water sources. It has 69 recorded EPA violations, including 26 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).
Water Quality Snapshot: PENDLETON, CITY OF
PENDLETON, CITY OF is a local-owned community water system that delivers drinking water to 16,996 residents in PENDLETON, Oregon (Umatilla County) through 6,020 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 69 total violations for this system , of which 26 (38%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 34 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 0.0048 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.
Across Oregon, EPA tracks 2,518 public water systems serving 4,005,242 people, with 206,659 cumulative violations and 20,339 health-based violations on record. About 99% of systems in the state carry at least one violation, and state-wide the average per system is 82.1 violations. PENDLETON, CITY OF's 69 violations sit below the Oregon average. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 6,020
- County
- Umatilla
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 34
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 18 | 2012 |
| Coliform (TCR) | MR | 12 | 2008 |
| Surface Water Treatment Rule | MR | 8 | 2018 |
| Surface Water Treatment Rule | TT | 8 | 2001 |
| Interim Enhanced Surface Water Treatment Rule | MR | 6 | 2018 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2024 |
| TTHM | MR | 3 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2023 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1976 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 240 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOS | 8/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/5/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBS | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 8/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFUnA | 8/5/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFNA | 8/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 8/5/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| lithium | 8/5/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFDA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NEtFOSAA | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 8/5/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFDoA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 8/5/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFBA | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 8/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 8/5/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 6:2 FTS | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMBA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 8/5/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 8/5/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 8/5/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 5/28/2024 | 0.0048 µg/L | 0.003 µg/L | Detected |
| NMeFOSAA | 5/28/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTA | 5/28/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 5/28/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 5/28/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 5/28/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFHpS | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 5/28/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFMBA | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 5/28/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 5/28/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 5/28/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 5/28/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeS | 5/28/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 6:2 FTS | 5/28/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOA | 5/28/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for PENDLETON, CITY OF.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID OR4100613 on SDWISSource: EPA SDWIS Federal Reports Search
Oregon Drinking Water Authority
Oregon's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find OR regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2024 | Total Haloacetic Acids (HAA5) | MR | 3 | SDWIS / OR4100613 / 2456 |
| 2024 | TTHM | MR | 3 | SDWIS / OR4100613 / 2950 |
| 2023 | Consumer Confidence Rule | Other | 2 | SDWIS / OR4100613 / 7000 |
| 2018 | Surface Water Treatment Rule | MR | 8 | SDWIS / OR4100613 / 0200 |
| 2018 | Interim Enhanced Surface Water Treatment Rule | MR | 6 | SDWIS / OR4100613 / 0300 |
| 2012 | Coliform (TCR) | MCL | 18 | SDWIS / OR4100613 / 3100 |
| 2008 | Coliform (TCR) | MR | 12 | SDWIS / OR4100613 / 3100 |
| 2001 | Surface Water Treatment Rule | TT | 8 | SDWIS / OR4100613 / 0200 |
| 1976 | Combined Radium (-226 and -228) | MR | 1 | SDWIS / OR4100613 / 4010 |
| 1976 | Gross Alpha, Excl. Radon and U | MR | 1 | SDWIS / OR4100613 / 4000 |
How PENDLETON, CITY OF Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | PENDLETON, CITY OF | Oregon avg | Federal benchmark |
|---|---|---|---|
| Total violations | 69 | 82.1 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 26 | 8.1 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | 1 compound | 24% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 16,996 | 1,591 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,518 regulated public water systems in Oregon.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
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Read our methodology — how this data is sourced, computed, and verified.