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Review government records associated with Mason City, Iowa.
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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 Mason City, IA from EPA SDWIS.
Mason City Water Department
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 27,338 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASNo health-relevant impairment records shown among the assessment records in this report.
Reviewed: source records as of 2026
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.
Cerro Gordo County
Assessment year: 2020
According to EPA, a cancer risk of 20-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 20 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
No EPA nonattainment designation records shown for this report.
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.
Ag Processing Inc
Reported: 2024
Curries Div of Aadg Inc.
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 110071102210
Reported: Nov 2021
EPA FRS Registry ID 110060755026
Reported: Nov 2021
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO3 sites with active cleanup or investigation status
111 S Washington Avenue, Mason City
Reported: Feb 2026
1454 N Federal Ave, Mason City
Reported: Feb 2026
19 South Federal Avenue, Mason City
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
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.
More MSHA records matched the search than this preview shows.
Recently updated active/intermittent sites (1)
Data from MSHA
Cerro Gordo County, IA
EPA Radon Zone Map (June 2024 release)
Cerro Gordo 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.
Cerro Gordo County, IowaPop. 42,409
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 | 9,412 | 6,935 | 7,972 |
| Poor or Fair Health | 13.1% | 12.5% | 14.2% |
| Poor Physical Health Days | 3.1 | 2.9 | 3.3 |
| Poor Mental Health Days | 4.7 | 4.5 | 4.8 |
| Adult Smoking | 16.8% | 15.5% | 15.0% |
| Adult Obesity | 35.7% | 36.9% | 34.0% |
| Air Pollution - Particulate Matter | 7.4 | 7.4 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 8.5% | 8.5% | 9.6% |
| Life Expectancy | 76.4 | 78.1 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Mason City.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 1 violation for Mason City Water Department.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
We don't have air monitoring measurements for Mason City yet.
The radon data for Mason City covers Cerro Gordo 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 2 Superfund sites: Mason City Coal Gasification Plant; Northwestern States Portland Cement Co..
This city report shows 3 brownfield sites: 111 S Washington Avenue; 1454 N Federal Ave; 19 South Federal Avenue.
View on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Mason City reports a life expectancy of 76.4 years in Cerro Gordo County, Iowa.
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 City reports 9,412 years of life lost to deaths before age 75 per 100,000 residents in Cerro Gordo County, Iowa. 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 City lists fine-particle pollution (PM2.5) at 7.4 micrograms per cubic meter in Cerro Gordo County, Iowa.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.