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Review government records associated with O'Fallon, Illinois.
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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 O'Fallon, IL from EPA SDWIS.
O Fallon
Active health-based drinking-water issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 46,603 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 Feb 2024 to Nov 2024.
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 O'Fallon 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.
Mill Creek-Silver Creek
Reported: Nov 2026
Health-relevant causes: Pathogens
Affected uses: Ecological, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
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.
St. Clair County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 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.
St. Louis: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
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.
St. Louis
PM2.5 · PM-2.5 (1997 Standard)
Classification: Moderate
Original designation: Apr 2005
Current design value: 9.9 µg/m³ (2023-2025)
St. Louis-St. Charles-Farmington
Ozone · 8-Hour Ozone (2008 Standard)
Classification: Marginal
Original designation: Jul 2012
Current design value: 0.07 ppm (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Alton Horace Mann Elementary School
Annual mean: 0.044 Parts per million
EPA primary exceedance count: 1 (Ozone 8-hour 2015)
Observation year: 2025
Annual mean: 8.7 Micrograms/cubic meter (LC)
Observation year: 2025
Blair Street — St. Louis, Missouri
Annual mean: 0.2 Parts per million
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.
US Air Force/Scott Air Force Base
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
102 East State Street, O'fallon
Reported: Feb 2026
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
Reviewed: reporting year 2024
No MSHA mine or extraction site records shown for this report.
St. Clair County, IL
EPA Radon Zone Map (June 2024 release)
St. Clair 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.
St. Clair County, IllinoisPop. 252,671
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 | 11,047 | 7,549 | 7,972 |
| Poor or Fair Health | 15.4% | 14.4% | 14.2% |
| Poor Physical Health Days | 3.5 | 3.2 | 3.3 |
| Poor Mental Health Days | 4.6 | 4.2 | 4.8 |
| Adult Smoking | 16.3% | 12.6% | 15.0% |
| Adult Obesity | 43.7% | 34.3% | 34.0% |
| Air Pollution - Particulate Matter | 9.2 | 8.8 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 11.2% | 9.7% | 9.6% |
| Life Expectancy | 74.7 | 78.0 | 77.6 |
EPA testing found PFAS in water samples from O Fallon. Results dated Feb 7, 2024 to Nov 7, 2024 include PFBA at 0.0099 to 0.013 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 O Fallon.
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 O'Fallon.
The monitoring station at Alton Horace Mann Elementary School recorded an annual average of 0.044 Parts per million for ozone in 2025.
The monitoring station at Alton Horace Mann Elementary School recorded an annual average of 8.7 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Blair Street, St. Louis, Missouri recorded an annual average of 0.2 Parts per million for carbon monoxide in 2025.
The radon data for O'Fallon covers St. Clair 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 1 brownfield site: Former Clark Gas Station.
The county data for O'Fallon reports a life expectancy of 74.7 years in St. Clair County, Illinois.
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 O'Fallon reports 11,047 years of life lost to deaths before age 75 per 100,000 residents in St. Clair County, Illinois. 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 O'Fallon lists fine-particle pollution (PM2.5) at 9.2 micrograms per cubic meter in St. Clair County, Illinois.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.