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Review government records associated with Mason, Ohio.
Toxin Scout is in beta. Please verify important findings with the linked sources.
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Preparing Mason 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 Mason, OH from EPA SDWIS.
Warren County
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 81,975 people
Western Water Company
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 39,508 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 Mar 2023 to Dec 2023.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
4 PFAS sample results above EPA limits
Sample period: Mar 2023 to Dec 2023
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 |
|---|---|---|---|---|
| PFOS | 0.0141 | 0.0040 | 2023-09-05 | Yes |
| PFOS | 0.0125 | 0.0040 | 2023-09-05 | Yes |
| PFOS | 0.0107 | 0.0040 | 2023-12-04 | Yes |
| PFOS | 0.0055 | 0.0040 | 2023-03-07 | Yes |
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Mason 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.
Muddy 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
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.
Warren 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.
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Cincinnati
Ozone · 8-Hour Ozone (2015 Standard)
Classification: Marginal
Current design value: 0.074 ppm (2023-2025)
Historical designations under the revoked 1997 ozone standard
These records describe historical designations. EPA revoked the 1997 ozone standard on April 6, 2015.
Cincinnati-Hamilton Area
Historical standard: 0.08 ppm (8-hour)
Historical designation: Maintenance · Former Subpart 1
Original designation: Jun 2004
Open data source: EPA final revocation ruleContinuing requirements have not been verified for this area.
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Amanda Elem — Middletown, Ohio
Annual mean: 3.1 Parts per billion
Observation year: 2025
Annual mean: 17.3 Micrograms/cubic meter (25 C)
Observation year: 2025
Annual mean: 8.8 Micrograms/cubic meter (LC)
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.
Advics Manufacturing Ohio Inc
Reported: 2024
Cincinnati Fan & Ventilator Co
Reported: 2024
Fecon LLC
Reported: 2024
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 110009343148
Reported: Nov 2021
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
Warren County, OH
EPA Radon Zone Map (June 2024 release)
Warren County is EPA Radon Zone 1 (highest potential). EPA defines Zone 1 counties as having predicted average indoor screening levels above 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.
Warren County, OhioPop. 249,778
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 | 6,260 | 9,394 | 7,972 |
| Poor or Fair Health | 12.1% | 15.9% | 14.2% |
| Poor Physical Health Days | 3.0 | 3.6 | 3.3 |
| Poor Mental Health Days | 4.9 | 5.5 | 4.8 |
| Adult Smoking | 14.4% | 18.8% | 15.0% |
| Adult Obesity | 35.3% | 37.9% | 34.0% |
| Air Pollution - Particulate Matter | 10.5 | 8.9 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 8.6% | 10.9% | 9.6% |
| Life Expectancy | 78.4 | 75.6 | 77.6 |
EPA testing found PFAS in water samples from Western Water Company. Results dated Mar 7, 2023 to Dec 4, 2023 include PFOS at 0.0055 to 0.0141 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 3 violations for Warren County, including 1 marked active.
EPA drinking water records on this page list 6 violations for Western Water Company, including 2 marked active.
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 Mason.
The monitoring station at Amanda Elem, Middletown, Ohio recorded an annual average of 3.1 Parts per billion for sulfur dioxide in 2025.
The monitoring station at Amanda Elem, Middletown, Ohio recorded an annual average of 17.3 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Amanda Elem, Middletown, Ohio recorded an annual average of 8.8 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The radon data for Mason covers Warren County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
This city report shows 1 Superfund site: Peters Cartridge Factory.
No brownfield sites were returned for this city report.
The county data for Mason reports a life expectancy of 78.4 years in Warren County, Ohio.
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 Mason reports 6,260 years of life lost to deaths before age 75 per 100,000 residents in Warren County, Ohio. 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 Mason lists fine-particle pollution (PM2.5) at 10.5 micrograms per cubic meter in Warren County, Ohio.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.