Community Water System · PWS OR4101513
Hillsboro, City Of
Hillsboro, Oregon 97123 - drinking water served from surface water sources to 92,632 people, tracked in EPA SDWIS and UCMR5.
- 92,632
- People served
- 9
- EPA violations
- 0
- Health-based
- No PFAS
- UCMR5 result
The verdict
EPA records 9 drinking-water violations at Hillsboro, City Of - below the Oregon per-system average.
- 9
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 92,632
- People served by this system
- 0
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Hillsboro, City Of
Hillsboro, City Of is a local-owned community water system that delivers drinking water to 92,632 residents in Hillsboro, Oregon (Washington County) through 28,385 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 9 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 7 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.
The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 2 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.
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. Statewide, 30 of 125 UCMR5-tested systems have reported PFAS detections (24%).
Hillsboro, City Of's 9 violations sit below the Oregon average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 28,385
- County
- Washington
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 7
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MR | 2 | 2009 |
| Coliform (TCR) | MR | 2 | 2010 |
| TTHM | MR | 2 | 2009 |
| Revised Total Coliform Rule | MON | 1 | 2016 |
| Consumer Confidence Rule | Other | 1 | 2025 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHxA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 7/12/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 7/12/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFUnA | 7/12/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTrDA | 7/12/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFPeA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/12/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/12/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMPA | 7/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/12/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 7/12/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/12/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 4/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 4/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NEtFOSAA | 4/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 4/2/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 4/2/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 4/2/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFEESA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/2/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 4/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 4/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 4/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 4/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/2/2024 | <5.00 ppt | 5.00 ppt | 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 Hillsboro, 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 OR4101513 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 |
|---|---|---|---|---|
| 2025 | Consumer Confidence Rule | Other | 1 | SDWIS / OR4101513 / 7000 |
| 2016 | Revised Total Coliform Rule | MON | 1 | SDWIS / OR4101513 / 8000 |
| 2010 | Coliform (TCR) | MR | 2 | SDWIS / OR4101513 / 3100 |
| 2009 | Total Haloacetic Acids (HAA5) | MR | 2 | SDWIS / OR4101513 / 2456 |
| 2009 | TTHM | MR | 2 | SDWIS / OR4101513 / 2950 |
How Hillsboro, City Of Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Hillsboro, City Of | Oregon avg | Federal benchmark |
|---|---|---|---|
| Total violations | 9 | 82.1 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 0 | 8.1 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 24% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 92,632 | 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 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Hillsboro, City Of water safe to drink? ▼
How many people does Hillsboro, City Of serve? ▼
What type of violations does Hillsboro, City Of have? ▼
Has PFAS been detected in Hillsboro, City Of water? ▼
What water source does Hillsboro, City Of use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.