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Review government records associated with Cornelius, Oregon.
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Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Cornelius, OR from EPA SDWIS.
Cornelius, City of
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 14,490 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
City of Forest Grove-Tualatin River
Reported: Nov 2026
Health-relevant causes: Metals (other Than Mercury), Pathogens
Affected uses: Ecological, Fishconsumption, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
No NPDES-permitted facility records with current violation flags surfaced for this city report.
Reviewed: active/open records as of Q4 2025
Data from EPA ECHO
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Washington County
Assessment year: 2020
According to EPA, a cancer risk of 40-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 40 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
EPA designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Portland Area: Portland Metro Service District Boundary
CO · Carbon Monoxide (1971 Standard)
Classification: Moderate <= 12.7ppm
Original designation: Nov 1990
Current design value: 1.5 ppm (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Hillsboro - Hare Field (Hhf)
Annual mean: 5.5 Micrograms/cubic meter (LC)
Observation year: 2025
Portland - Helensview School (Pch)
Annual mean: 7.5 Micrograms/cubic meter (25 C)
Observation year: 2025
Portland - Humboldt School (Phs)
Annual mean: 8.7 Micrograms/cubic meter (25 C)
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Dmh Inc
Reported: 2024
Ttm Technologies N.A. LLC
Reported: 2024
Reviewed: source query run Nov 2026
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO1 site with active cleanup or investigation status
Baseline St N 10th Ave, Cornelius
Reported: Feb 2026
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Reviewed: reporting year 2024
No MSHA mine or extraction site records shown for this report.
Washington County, OR
EPA Radon Zone Map (June 2024 release)
Washington County is EPA Radon Zone 2 (moderate potential). EPA defines Zone 2 counties as having predicted average indoor screening levels between 2 pCi/L and 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
Minimal flood hazard — outside the 1% and 0.2% annual chance floodplains.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Washington County, OregonPop. 600,176
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 4,539 | 6,705 | 7,972 |
| Poor or Fair Health | 11.9% | 14.2% | 14.2% |
| Poor Physical Health Days | 3.1 | 3.3 | 3.3 |
| Poor Mental Health Days | 5.1 | 5.4 | 4.8 |
| Adult Smoking | 10.4% | 12.7% | 15.0% |
| Adult Obesity | 31.0% | 30.6% | 34.0% |
| Air Pollution - Particulate Matter | 6.9 | 7.7 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 8.0% | 8.3% | 9.6% |
| Life Expectancy | 81.8 | 78.7 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Cornelius.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 8 violations for the City of Cornelius.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Cornelius.
The monitoring station at Hillsboro-Hare Field (Hhf) recorded an annual average of 5.5 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Portland-Helensview School (Pch) recorded an annual average of 7.5 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Portland-Humboldt School (Phs) recorded an annual average of 8.7 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The radon data for Cornelius covers Washington County. EPA places this area in Zone 2, with a predicted average indoor radon screening level of 2 to 4 picocuries per liter.
No Superfund sites were returned for this city report.
This city report shows 3 brownfield sites: Cornelius City Complex; Plaza Los Amigos; Statton Property Former Gas Station.
EPA Superfund recordsView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Cornelius reports a life expectancy of 81.8 years in Washington County, Oregon.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Cornelius reports 4,539 years of life lost to deaths before age 75 per 100,000 residents in Washington County, Oregon. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Cornelius lists fine-particle pollution (PM2.5) at 6.9 micrograms per cubic meter in Washington County, Oregon.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.