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Dewey County, Oklahoma: environmental and disease records

Cancer mortality in Dewey County is 191.5 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. Federal databases place 516 regulated facilities, sites and hazards inside the county, led by Air permit holder (minor source) (483), Gas station (mapped facility) (7), Wind power plant (5). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 20 in a million, driven mainly by formaldehyde.

Rates are age-adjusted per 100,000 people. A cancer signal is marked significant when the lower bound of its 95 percent confidence interval is above the U.S. rate. Facility counts use active federal records located inside the county boundary. Approximate county center: 35.992, -99.0086.

How this county ranks in Oklahoma

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Cancer deaths and new cases versus the United States

Source: NCI and CDC State Cancer Profiles, both sexes, all ages. Sorted by the ratio of the county rate to the U.S. rate.

Cancer rates for Dewey County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
All cancer	Deaths	191.5	143.2	1.34xSignificant	143.7 to 251.5	2020-2024
Lung & bronchus	New cases	59.2	51.8	1.14x	35 to 95.9	2019-2023
All cancer	New cases	486.3	453.4	1.07x	402.6 to 582.8	2019-2023

Mortality measures versus the U.S. county median

Source: County Health Rankings, built from CDC National Vital Statistics System death records. The comparison value is the median of all U.S. counties.

Mortality measures for Dewey County
Measure	County	U.S. median	Difference	Unit
Premature death	9,824.5	9,842.6	-0%	years of life lost before age 75 per 100,000
Life expectancy	73	75.3	-3%	years
Child mortality	n/a	59.8	n/a	deaths under age 18 per 100,000
Infant mortality	n/a	6.2	n/a	deaths under age 1 per 1,000 live births
Injury deaths	149.5	96.9	+54%	deaths per 100,000
Drug overdose deaths	n/a	28.6	n/a	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 20 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde16.11 per million
Carbon Tetrachloride2.79 per million
Acetaldehyde1.07 per million
Benzene0.57 per million

EPA Air Quality Index 2025

Monitored on 364 days: 232 good, 1 unhealthy for sensitive groups or worse. Median AQI 46, peak 164.

Regulated facilities, sites and hazards by type

516 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

Air permit holder (minor source)483
Gas station (mapped facility)7
Wind power plant5
Rail grade crossing4
Major air pollution source3
NPDES wastewater discharge permit3
Public airport2
TRI reporting facility2
Toxic chemical release facility (TRI)2
EPA air quality monitor1
Brownfield property1
Large greenhouse gas emitter1
Small hazardous waste generator1
Hazardous waste transporter1

Highest-severity records

The 25 records with the highest Envyrofax severity in the county, with the agency identifier to cite in a records request.

Dcp Midstream Lp Cimarron Plant, Seiling
Toxic chemical release facility (TRI). Chemicals: Cyclohexane, Benzene, n-Hexane, Toluene and 2 more. Reports carcinogens. 34,862 lbs released over 5 years.
TRI facility ID 7366WDCPMDHWY27 (U.S. EPA Toxics Release Inventory)
Severity 8
Dcp Midstream, Lp, Cimarron Plant, Seiling
TRI reporting facility.
EPA FRS registry ID 110056360815 (U.S. EPA ECHO) Agency record
Severity 5.9
Iochem Corp, Vici
Toxic chemical release facility (TRI). Chemicals: Chlorine, Methanol, N-Hydroxyethylethylenediamine, Certain glycol ethers. 557 lbs released over 5 years.
TRI facility ID 73859CHMCR312MI (U.S. EPA Toxics Release Inventory)
Severity 5.1
Iochem Corporation, Vici
TRI reporting facility.
EPA FRS registry ID 110000598416 (U.S. EPA ECHO) Agency record
Severity 4.9
SEILING, Seiling
EPA air quality monitor.
Record ID 400430860 (U.S. EPA AirData)
Severity 4.8
Dcp Midstream Lp/Cimarron Plt, Seiling
Major air pollution source.
EPA FRS registry ID 110007161980 (U.S. EPA ECHO) Agency record
Severity 4
Oneok Field Svc/Leedey Gas Plt, Leedey
Major air pollution source.
EPA FRS registry ID 110007162523 (U.S. EPA ECHO) Agency record
Severity 3.5
Panhandle Eastern Pipeline/Seiling Sta, Seiling
Major air pollution source.
EPA FRS registry ID 110007164978 (U.S. EPA ECHO) Agency record
Severity 3.5
Cypress 1816 1 35 H, Taloga
Air permit holder (minor source).
EPA FRS registry ID 110054889750 (U.S. EPA ECHO) Agency record
Severity 3.3
City Of Seiling American Legion Building, Seiling
Brownfield property.
EPA FRS registry ID 110044759669 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Dcp Midstream Lp/Cimarron Plt, Seiling
Large greenhouse gas emitter.
EPA FRS registry ID 110007161980 (U.S. EPA ECHO) Agency record
Severity 3
Redcliff Midstream Llc / Wind Row Compressor Station, Seiling
Air permit holder (minor source). Penalties $3,938.
EPA FRS registry ID 110070222707 (U.S. EPA ECHO) Agency record
Severity 2.3
Seiling, Seiling
Public airport. O.
Record ID 1S4 (FAA / U.S. DOT)
Severity 2
Vici Muni, Vici
Public airport. O.
Record ID 5O1 (FAA / U.S. DOT)
Severity 2
Dcp Midstream Lp/Fonda Booster, Canton
Air permit holder (minor source).
EPA FRS registry ID 110002445168 (U.S. EPA ECHO) Agency record
Severity 1.5
Purvine Farms, Inc., Fay
NPDES wastewater discharge permit.
EPA FRS registry ID 110011013857 (U.S. EPA ECHO) Agency record
Severity 1.5
Smith Ranch, Taloga
NPDES wastewater discharge permit.
EPA FRS registry ID 110011013893 (U.S. EPA ECHO) Agency record
Severity 1.5
Chain Feedlot, Inc., Oakwood
NPDES wastewater discharge permit.
EPA FRS registry ID 110011014179 (U.S. EPA ECHO) Agency record
Severity 1.5
Oneok - Ogt - Thunder Plains Cs, Seiling
Small hazardous waste generator.
EPA FRS registry ID 110071355025 (U.S. EPA ECHO) Agency record
Severity 1.5
Crawley Petroleum Corp / Ella 3 19h Pad, Canton
Air permit holder (minor source).
EPA FRS registry ID 110071538027 (U.S. EPA ECHO) Agency record
Severity 1.5
E0830 Rd, Fay
Rail grade crossing.
Record ID 671365H (Federal Railroad Administration)
Severity 1.3
N2440, Fay
Rail grade crossing.
Record ID 671366P (Federal Railroad Administration)
Severity 1.3
E0820, Fay
Rail grade crossing.
Record ID 671367W (Federal Railroad Administration)
Severity 1.3
Dcp Operating Co Lp / Aledo Booster Station, Aledo
Air permit holder (minor source).
EPA FRS registry ID 110007385356 (U.S. EPA ECHO) Agency record
Severity 1.3
Dcp Midstream Lp/Riverview Booster, Webb
Air permit holder (minor source).
EPA FRS registry ID 110007387201 (U.S. EPA ECHO) Agency record
Severity 1.3

Correctional facilities

Prisons, jails and corrections operations with an EPA facility record, and the drinking water and wastewater compliance attached to them.

No correctional facility with an EPA record is located in this county.

Discovery / public records

Records to request for Dewey County

Oklahoma state cancer registry
Cancer incidence counts by census tract or ZIP code, by cancer type and year (de-identified). Any cancer cluster inquiries or investigations in Dewey County, and their findings.
Oklahoma vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Oklahoma health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Oklahoma environmental agency and the U.S. EPA regional office
Compliance history, inspection reports, notices of violation, penalties and enforcement actions for each facility above, cited by EPA FRS registry ID.
Oklahoma drinking water program
Violation notices, sampling results and sanitary surveys for the public water systems serving the county, including any system serving a correctional facility.
Department of corrections or county sheriff
Water testing, grievances and environmental health inspections for the correctional facilities listed above.

Each Envyrofax address report includes a printable records request worksheet with the custodian and the exact request wording per finding.

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