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Review government records associated with Webster Groves, Missouri.
Toxin Scout is in beta. Please verify important findings with the linked sources.
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Preparing Webster Groves 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 Webster Groves, MO from EPA SDWIS.
St Louis City Pws
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 304,709 people
Mo American St Louis St Charles Counties
PFAS detected below the official threshold used by this report.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 1,111,000 people
Indian Hills Utilities Operating Company
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 1,600 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 Jun 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 Webster Groves 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.
Deer 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.
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.
St. Louis 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.
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 Area
CO · Carbon Monoxide (1971 Standard)
Classification: Not Classified
Original designation: Nov 1990
Current design value: 1.6 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
Arnold West
Annual mean: 10.9 Parts per billion
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.
Bi-State Emulsions
Reported: 2024
O'hare Foundry Corp
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 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
Sites 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.
No records shown in this group.
Reviewed: status dates within last 5 years
Data from MSHA
St. Louis County, MO
EPA Radon Zone Map (June 2024 release)
St. Louis 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.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
Recent Incidents (last 5 years)
SPIRE MISSOURI INC. EAST
Incident date: Jan 3, 2025
Property damage: $2,300
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
St. Louis County, MissouriPop. 990,414
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 | 9,071 | 9,478 | 7,972 |
| Poor or Fair Health | 14.6% | 16.4% | 14.2% |
| Poor Physical Health Days | 3.3 | 3.7 | 3.3 |
| Poor Mental Health Days | 5.1 | 5.2 | 4.8 |
| Adult Smoking | 16.2% | 18.1% | 15.0% |
| Adult Obesity | 34.1% | 37.6% | 34.0% |
| Air Pollution - Particulate Matter | 9.2 | 7.6 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 9.4% | 9.9% | 9.6% |
| Life Expectancy | 76.8 | 75.8 | 77.6 |
EPA testing found PFAS in water samples from Mo American St Louis St Charles Counties. Results dated Jun 17, 2024 include PFBA at 0.005 to 0.0051 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 17 violations for St Louis City Pws, including 1 marked active.
The EPA drinking water records available here list no violations for Mo American St Louis St Charles Counties.
The EPA drinking water records available here list no violations for Indian Hills Utilities Operating Company.
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 Webster Groves.
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 Arnold West recorded an annual average of 10.9 Parts per billion for nitrogen dioxide in 2025.
Download 2025 EPA annual monitor dataCurrent air quality on AirNow
The radon data for Webster Groves covers St. Louis 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 Webster Groves reports a life expectancy of 76.8 years in St. Louis County, Missouri.
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 Webster Groves reports 9,071 years of life lost to deaths before age 75 per 100,000 residents in St. Louis County, Missouri. 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 Webster Groves lists fine-particle pollution (PM2.5) at 9.2 micrograms per cubic meter in St. Louis County, Missouri.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
Federal pipeline records list an incident involving Spire Missouri Inc. East near Webster Groves on Jan 3, 2025. The reported release was natural gas.