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Review government records associated with Sheridan, Wyoming.
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Preparing Sheridan 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 Sheridan, WY from EPA SDWIS.
Sheridan, City of
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 22,700 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 PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Lower Big Goose Creek
Reported: Nov 2026
Health-relevant causes: Pathogens
Affected uses: 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.
Sheridan 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
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.
Sheridan County; City of Sheridan
PM10 · PM-10 (1987 Standard)
Classification: Moderate
Original designation: Nov 1990
Current design value: 0.3 est. exc. (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Sheridan - Police Sta. Slam Site
Annual mean: 13.9 Micrograms/cubic meter (25 C)
Observation year: 2025
Annual mean: 5.0 Micrograms/cubic meter (LC)
Observation year: 2025
Sheridan Mobile
Annual mean: 1.1 Parts per billion
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
Data from EPA ECHO
Reviewed: source records as of 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
420 Crook St, Sheridan
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
Release reports
Reported: Dec 2021
Reported: Dec 2021
Data from EPA UST Finder
Reviewed: reporting year 2024
Formerly Used Defense Sites are properties previously owned by, leased to, or otherwise possessed by the United States and under the jurisdiction of the Secretary of Defense. The FUDS program addresses environmental restoration at these properties.
Open data source: USACE FUDSSites 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
Sheridan County, WY
EPA Radon Zone Map (June 2024 release)
Sheridan 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.
Special Flood Hazard Area — 1% annual chance of flooding (100-year floodplain) with base flood elevation.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
No EPA ECHO RMP facility records with a usable location matched this city report.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
No records dated within the last 5 years surfaced for this city report.
Reviewed: last 5 years
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Sheridan County, WyomingPop. 32,096
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 | 6,844 | 8,747 | 7,972 |
| Poor or Fair Health | 12.5% | 12.9% | 14.2% |
| Poor Physical Health Days | 3.1 | 3.5 | 3.3 |
| Poor Mental Health Days | 4.7 | 4.9 | 4.8 |
| Adult Smoking | 16.5% | 17.1% | 15.0% |
| Adult Obesity | 30.4% | 32.2% | 34.0% |
| Air Pollution - Particulate Matter | 5.8 | 3.6 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 7.7% | 7.6% | 9.6% |
| Life Expectancy | 78.6 | 76.8 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Sheridan.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 1 violation for the City of Sheridan.
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 Sheridan.
The monitoring station at Sheridan-Police Sta. Slam Site recorded an annual average of 13.9 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Sheridan-Police Sta. Slam Site recorded an annual average of 5 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Sheridan Mobile recorded an annual average of 1.1 Parts per billion for sulfur dioxide in 2025.
The radon data for Sheridan covers Sheridan County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund sites were returned for this city report.
This city report shows 3 brownfield sites: 1604 N Main Street; 1627 North Main Street; 420 Crook Street.
EPA Superfund recordsView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Sheridan reports a life expectancy of 78.6 years in Sheridan County, Wyoming.
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 Sheridan reports 6,844 years of life lost to deaths before age 75 per 100,000 residents in Sheridan County, Wyoming. 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 Sheridan lists fine-particle pollution (PM2.5) at 5.8 micrograms per cubic meter in Sheridan County, Wyoming.
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 Montana-Dakota Utilities Co near Sheridan on Nov 23, 2016. The reported release was natural gas.