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Review government records associated with Chowchilla, California.
Toxin Scout is in beta. Please verify important findings with the linked sources.
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Preparing Chowchilla environmental records...
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 Chowchilla, CA from EPA SDWIS.
Chowchilla City Water Dept
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 13,916 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.
1 PFAS sample result above EPA limits
Sample period: Apr 2025
UCMR5 results are sampled by public water system, not every household. Confirm your water provider before treating these as tap-water results for a specific address.
| Chemical | Concentration (µg/L) | EPA Limit (µg/L) | Sample date | Over Limit |
|---|---|---|---|---|
| PFOA | 0.0045 | 0.0040 | 2025-04-22 | Yes |
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Chowchilla 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.
Ash Slough-Fresno River
Reported: Nov 2026
Health-relevant causes: Metals (other Than Mercury)
Affected uses: Ecological
Data from EPA ATTAINS
Reviewed: source records as of Q4 2025
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.
Madera 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.
San Joaquin Valley: Ozone
NonattainmentExtreme8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
San Joaquin Valley: PM2.5
NonattainmentSeriousPM-2.5 (2012 Standard)
Original designation: Apr 2015
Health effects (EPA): Cardiovascular disease, respiratory illness, premature death (EPA)
San Joaquin Valley 1997 PM2.5 Annual: PM2.5
NonattainmentSeriousPM-2.5 (1997 Standard)
Original designation: Apr 2005
Health effects (EPA): Cardiovascular disease, respiratory illness, premature death (EPA)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Madera-City
Annual mean: 0.042 Parts per million
EPA primary exceedance count: 3 (Ozone 8-hour 2015)
Observation year: 2025
Annual mean: 30.2 Micrograms/cubic meter (25 C)
Observation year: 2025
Annual mean: 9.3 Micrograms/cubic meter (LC)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
Air Violations
Last inspected: Dec 2025
Last inspected: Dec 2025
Data from EPA ECHO
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Certainteed LLC
Reported: 2024
Oldcastle Precast Inc
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 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
17775 AVENUE 23-1/2, CHOWCHILLA
1.8 miles away · MADERA County
Reported: Nov 2026
Robertson Blvd., Highway 99 - 16499 Avenue 26, 16329 Avenue 26, 17085 Avenue 26, Chowchilla
0.9 miles away · MARIPOSA County
Reported: Nov 2026
260 SOUTH 3RD STREET, CHOWCHILLA
1.0 miles away · MADERA 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
Toxics Release Inventory data — chemicals disposed on-site at reporting facilities.
Oldcastle Precast Inc
Open data source: View EPA TRI facility recordNo MSHA mine or extraction site records shown for this report.
Madera County, CA
EPA Radon Zone Map (June 2024 release)
Madera 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.
No FEMA flood-zone records shown for this report.
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.
Madera County, CaliforniaPop. 160,256
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 | 8,372 | 6,373 | 7,972 |
| Poor or Fair Health | 23.4% | 15.8% | 14.2% |
| Poor Physical Health Days | 4.5 | 3.1 | 3.3 |
| Poor Mental Health Days | 5.7 | 4.7 | 4.8 |
| Adult Smoking | 15.7% | 8.8% | 15.0% |
| Adult Obesity | 35.9% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 10.0 | 7.1 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 12.5% | 10.8% | 9.6% |
| Life Expectancy | 77.4 | 79.9 | 77.6 |
EPA testing found PFAS in water samples from Chowchilla City Water Department. Results dated Apr 22, 2025 include PFOA at 0.0045 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 2 violations for Chowchilla City Water Department.
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 Chowchilla.
The monitoring station at Madera-City recorded an annual average of 0.042 Parts per million for ozone in 2025.
The monitoring station at Madera-City recorded an annual average of 30.2 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Madera-City recorded an annual average of 9.3 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The radon data for Chowchilla covers Madera 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 or brownfield sites were returned for this city report.
The county data for Chowchilla reports a life expectancy of 77.4 years in Madera 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 Chowchilla reports 8,372 years of life lost to deaths before age 75 per 100,000 residents in Madera 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 Chowchilla lists fine-particle pollution (PM2.5) at 10.0 micrograms per cubic meter in Madera County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.