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Review government records associated with Oroville, California.
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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 Oroville, CA from EPA SDWIS.
Cal-Water Service Co.-Oroville
PFAS detected below the official threshold used by this report.
Reviewed: active/open records as of Q1 2026
City appears in system name · Serves 11,106 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Apr 2025.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Oroville drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
EPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Oregon Gulch-Feather River
Reported: Nov 2026
Health-relevant causes: Mercury
Affected uses: Ecological, Fishconsumption, Other
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Last inspected: Dec 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.
Butte County
Assessment year: 2020
According to EPA, a cancer risk of 50-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 50 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.
Butte County: Ozone
NonattainmentMarginal8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Chico (Butte County): Ozone
NonattainmentMarginal8-Hour Ozone (2008 Standard)
Original designation: Jul 2012
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Chico
PM2.5 · PM-2.5 (2006 Standard)
Classification: Moderate
Original designation: Dec 2009
Current design value: 23 µg/m³ (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Chico-East Avenue
Annual mean: 0.3 Parts per million
Observation year: 2025
Annual mean: 10.0 Parts per billion
Observation year: 2025
Annual mean: 0.034 Parts per million
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
EPA records for current, proposed and formerly listed Superfund sites on the National Priorities List (NPL).
Open data source: Search EPA ECHOEPA FRS Registry ID 110033607390
Reported: Nov 2021
EPA FRS Registry ID 110008262539
Reported: Nov 2021
EPA FRS Registry ID 110009268167
Reported: Nov 2021
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO2 sites with active cleanup or investigation status
2800 Richter Avenue, Oroville
Reported: Feb 2026
650 State Box Road, Oroville
Reported: Feb 2026
State environmental agencies maintain cleanup site databases that include state Superfund, voluntary cleanup, and brownfield remediation programs. These programs track additional sites beyond those on the federal NPL.
3 sites with active cleanup or investigation
Bounded by Myers, Montgomery and Huntoon Streets, Oroville
1.3 miles away · BUTTE County
Reported: Nov 2026
3301 FEATHER RIVER BLVD, OROVILLE
1.0 miles away · BUTTE County
Reported: Nov 2026
1685 and 1647 Parker Avenue, Oroville
0.4 miles away · BUTTE County
Reported: Nov 2026
Data from EPA ECHO
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Formerly Used Defense Sites are properties previously owned by, leased to, or otherwise possessed by the United States and under the jurisdiction of the Secretary of Defense. The FUDS program addresses environmental restoration at these properties.
Open data source: USACE FUDSSites regulated by the Mine Safety and Health Administration, including mines, sand and gravel operations, and portable crushers. Status and type are from the MSHA Mine Data Retrieval System. Records with active/intermittent status dates older than 5 years are shown as older records rather than current active sites.
More MSHA records matched the search than this preview shows.
Recently updated active/intermittent sites (1)
Data from MSHA
Butte County, CA
EPA Radon Zone Map (June 2024 release)
Butte County is EPA Radon Zone 3 (low potential). EPA defines Zone 3 counties as having predicted average indoor screening levels below 2 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.
Butte County, CaliforniaPop. 207,303
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 | 8,800 | 6,373 | 7,972 |
| Poor or Fair Health | 16.7% | 15.8% | 14.2% |
| Poor Physical Health Days | 3.8 | 3.1 | 3.3 |
| Poor Mental Health Days | 5.8 | 4.7 | 4.8 |
| Adult Smoking | 14.6% | 8.8% | 15.0% |
| Adult Obesity | 31.0% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 7.1 | 7.1 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 9.8% | 10.8% | 9.6% |
| Life Expectancy | 76.6 | 79.9 | 77.6 |
EPA testing found PFAS in water samples from Cal-Water Service Co.-Oroville. Results dated Apr 21, 2025 include PFBA at 0.0057 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 1 violation for Cal-Water Service Co.-Oroville.
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 Oroville.
The monitoring station at Chico-East Avenue recorded an annual average of 0.3 Parts per million for carbon monoxide in 2025.
The monitoring station at Chico-East Avenue recorded an annual average of 10 Parts per billion for nitrogen dioxide in 2025.
The monitoring station at Chico-East Avenue recorded an annual average of 0.034 Parts per million for ozone in 2025.
The radon data for Oroville covers Butte County. EPA places this area in Zone 3, with a predicted average indoor radon screening level below 2 picocuries per liter.
This city report shows 3 Superfund sites: Koppers Co., Inc. (Oroville Plant); Louisiana-Pacific Corp.; Western Pacific Railroad Co..
This city report shows 3 brownfield sites: 5 Unit Warehouse Property; Brass Ring Amusements; Dress Neitling Vacant Properties.
View on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Oroville reports a life expectancy of 76.6 years in Butte County, California.
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 Oroville reports 8,800 years of life lost to deaths before age 75 per 100,000 residents in Butte County, California. 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 Oroville lists fine-particle pollution (PM2.5) at 7.1 micrograms per cubic meter in Butte County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.