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McClain County, Oklahoma: environmental and disease records

Cancer mortality in McClain County is 167.2 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Non-Hodgkin lymphoma deaths at 1.7 times the U.S. rate and Lung & bronchus deaths at 1.4 times the U.S. rate. Federal databases place 296 regulated facilities, sites and hazards inside the county, led by Air permit holder (minor source) (211), Gas station (mapped facility) (27), Rail grade crossing (12). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 30 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: 35.0958, -97.5356.

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 McClain County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Non-Hodgkin lymphoma	Deaths	8.2	4.8	1.71xSignificant	4.9 to 12.9	2020-2024
Melanoma of the skin	New cases	37.7	23.8	1.58xSignificant	30.1 to 46.5	2019-2023
Kidney & renal pelvis	New cases	27.6	17.9	1.54xSignificant	21.4 to 35.2	2019-2023
Lung & bronchus	Deaths	43.1	30.2	1.43xSignificant	35.4 to 52	2020-2024
All cancer	Deaths	167.2	143.2	1.17xSignificant	151.4 to 184.2	2020-2024
Thyroid	New cases	14.5	13	1.12x	9.8 to 20.5	2019-2023
Non-Hodgkin lymphoma	New cases	20.1	18.5	1.09x	14.7 to 26.7	2019-2023
Lung & bronchus	New cases	55.3	51.8	1.07x	46.5 to 65.2	2019-2023
All cancer	New cases	483.2	453.4	1.07xSignificant	455.9 to 511.7	2019-2023
Liver & bile duct	Deaths	6.4	6.6	0.97x	3.8 to 10.3	2020-2024
Bladder	New cases	17.6	18.7	0.94x	12.6 to 23.9	2019-2023
Pancreas	Deaths	10.4	11.3	0.92x	6.8 to 15.2	2020-2024
Pancreas	New cases	12.3	13.9	0.88x	8.3 to 17.6	2019-2023
Leukemia	New cases	11.5	14.5	0.79x	7.8 to 16.6	2019-2023
Liver & bile duct	New cases	6.5	8.7	0.75x	3.8 to 10.5	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 McClain County
Measure	County	U.S. median	Difference	Unit
Premature death	8,739.5	9,842.6	-11%	years of life lost before age 75 per 100,000
Life expectancy	75.6	75.3	+0%	years
Child mortality	66.1	59.8	+11%	deaths under age 18 per 100,000
Infant mortality	7.1	6.2	+15%	deaths under age 1 per 1,000 live births
Injury deaths	93.1	96.9	-4%	deaths per 100,000
Drug overdose deaths	16.9	28.6	-41%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 30 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde21.67 per million
Carbon Tetrachloride2.85 per million
Acetaldehyde1.66 per million
Benzene1.31 per million

EPA Air Quality Index 2025

Monitored on 287 days: 225 good, 1 unhealthy for sensitive groups or worse. Median AQI 43, peak 126.

Regulated facilities, sites and hazards by type

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

Air permit holder (minor source)211
Gas station (mapped facility)27
Rail grade crossing12
Auto repair or body shop (mapped facility)10
NPDES wastewater discharge permit9
Public airport8
Brownfield property4
Small hazardous waste generator4
Large greenhouse gas emitter2
Landfill (mapped facility)2
Major air pollution source1
EPA air quality monitor1
Dry cleaner (mapped facility)1
Gas power plant1
Scrapyard (mapped facility)1
Superfund (NPL) site1
Wastewater plant (mapped facility)1

Highest-severity records

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

Hardage/Criner, Criner
Superfund (NPL) site. Hazard Ranking System score 51. NPL Site.
EPA site ID OKD000400093 (U.S. EPA Superfund (SEMS/NPL)) Agency record
Severity 10
Newcastle Public Works Auth., Newcastle
NPDES wastewater discharge permit. Penalties $32,250.
EPA FRS registry ID 110011008747 (U.S. EPA ECHO) Agency record
Severity 6
Og And E/Mcclain Energy Facility, Newcastle
Major air pollution source.
EPA FRS registry ID 110024410485 (U.S. EPA ECHO) Agency record
Severity 3.5
Mcclain Energy Facility, Newcastle
Gas power plant.
Record ID 55457 (U.S. Energy Information Administration)
Severity 3.5
Newcastle Land Acquisition, Newcastle
Brownfield property.
EPA FRS registry ID 110038765681 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Kelly Mud Pit, Maysville
Brownfield property.
EPA FRS registry ID 110071971186 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Washington - Buffalo Sno & Coffee, Washington
Brownfield property.
EPA FRS registry ID 110071973822 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Victory Family Church, Newcastle
Brownfield property.
EPA FRS registry ID 110071983747 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Og And E/Mcclain Energy Facility, Newcastle
NPDES wastewater discharge permit.
EPA FRS registry ID 110024410485 (U.S. EPA ECHO) Agency record
Severity 3
Eog Resources Inc / Mcmahan Ctb, Newcastle
Air permit holder (minor source). Penalties $6,300.
EPA FRS registry ID 110070551352 (U.S. EPA ECHO) Agency record
Severity 3
Eog Resources Inc / Hawk Dual Ctb, Newcastle
Air permit holder (minor source). Penalties $6,300.
EPA FRS registry ID 110070566602 (U.S. EPA ECHO) Agency record
Severity 3
Newcastle Landfill, Newcastle
Large greenhouse gas emitter.
EPA FRS registry ID 110005971154 (U.S. EPA ECHO) Agency record
Severity 2.5
Purcell Wwt, Purcell
NPDES wastewater discharge permit.
EPA FRS registry ID 110022621947 (U.S. EPA ECHO) Agency record
Severity 2.5
Og And E/Mcclain Energy Facility, Newcastle
Large greenhouse gas emitter.
EPA FRS registry ID 110024410485 (U.S. EPA ECHO) Agency record
Severity 2.5
Blanchard Wwtf, Blanchard
NPDES wastewater discharge permit.
EPA FRS registry ID 110071960389 (U.S. EPA ECHO) Agency record
Severity 2
David Jay Perry, Goldsby
Public airport. O.
Record ID 1K4 (FAA / U.S. DOT)
Severity 2
Purcell Muni - Steven E Shephard Fld, Purcell
Public airport. O.
Record ID 3O3 (FAA / U.S. DOT)
Severity 2
Scott Cleaners, Newcastle
Dry cleaner (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID node/5935556243 (OpenStreetMap contributors) Agency record
Severity 2
Pauline Longacre Water Treatment Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/1188812777 (OpenStreetMap contributors) Agency record
Severity 2
Landfill
Landfill (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/603135133 (OpenStreetMap contributors) Agency record
Severity 2
Landfill
Landfill (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/603135148 (OpenStreetMap contributors) Agency record
Severity 2
River Bend Industries, Blanchard
Small hazardous waste generator.
EPA FRS registry ID 110070339765 (U.S. EPA ECHO) Agency record
Severity 1.8
L-Wy-Co, Purcell
NPDES wastewater discharge permit.
EPA FRS registry ID 110011013474 (U.S. EPA ECHO) Agency record
Severity 1.5
John Griffith Estate Dairy, Newcastle
NPDES wastewater discharge permit.
EPA FRS registry ID 110011013802 (U.S. EPA ECHO) Agency record
Severity 1.5
Hardage-Criner Superfund Site, Lindsay
Small hazardous waste generator.
EPA FRS registry ID 110015742810 (U.S. EPA ECHO) Agency record
Severity 1.5

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 McClain 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 McClain 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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