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St. Clair County, Michigan: environmental and disease records

Cancer mortality in St. Clair County is 167.6 deaths per 100,000 people per year against a U.S. rate of 143.2, a statistically significant excess. The strongest disease signals are Esophagus deaths at 1.7 times the U.S. rate and Lung & bronchus deaths at 1.5 times the U.S. rate. Federal databases place 787 regulated facilities, sites and hazards inside the county, led by Rail grade crossing (188), NPDES wastewater discharge permit (157), Industrial wastewater discharge (99). 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: 42.8463, -82.6031.

How this county ranks in Michigan

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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 St. Clair County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Esophagus	Deaths	6.4	3.7	1.73xSignificant	5 to 8	2020-2024
Esophagus	New cases	6.9	4.6	1.5xSignificant	5.5 to 8.7	2019-2023
Lung & bronchus	Deaths	44.2	30.2	1.46xSignificant	40.5 to 48.2	2020-2024
Bladder	New cases	26.2	18.7	1.4xSignificant	23.3 to 29.4	2019-2023
Brain & nervous system	Deaths	6	4.4	1.36xSignificant	4.6 to 7.8	2020-2024
Lung & bronchus	New cases	67.4	51.8	1.3xSignificant	62.8 to 72.3	2019-2023
Pancreas	Deaths	14.2	11.3	1.26xSignificant	12.1 to 16.6	2020-2024
Melanoma of the skin	New cases	28.7	23.8	1.21xSignificant	25.4 to 32.3	2019-2023
Bladder	Deaths	4.8	4.1	1.17x	3.6 to 6.3	2020-2024
All cancer	Deaths	167.6	143.2	1.17xSignificant	160.1 to 175.5	2020-2024
Brain & nervous system	New cases	7	6.2	1.13x	5.4 to 9	2019-2023
Kidney & renal pelvis	New cases	19.8	17.9	1.11x	17.1 to 22.9	2019-2023
Non-Hodgkin lymphoma	Deaths	5.3	4.8	1.1x	4.1 to 6.9	2020-2024
All cancer	New cases	492.3	453.4	1.09xSignificant	478.9 to 506	2019-2023
Pancreas	New cases	14.7	13.9	1.06x	12.6 to 17.1	2019-2023
Non-Hodgkin lymphoma	New cases	18.3	18.5	0.99x	15.8 to 21.1	2019-2023
Melanoma of the skin	Deaths	1.9	2	0.95x	1.1 to 2.9	2020-2024
Thyroid	New cases	12.2	13	0.94x	9.8 to 14.9	2019-2023
Leukemia	Deaths	5.3	5.7	0.93x	3.9 to 6.9	2020-2024
Childhood cancer (under 15)	New cases	14.1	16.4	0.86x	8.5 to 22.2	2019-2023
Leukemia	New cases	12.4	14.5	0.86x	10.3 to 14.8	2019-2023
Liver & bile duct	New cases	7.4	8.7	0.85x	6 to 9.2	2019-2023
Liver & bile duct	Deaths	5.5	6.6	0.83x	4.2 to 7	2020-2024
Kidney & renal pelvis	Deaths	2.7	3.4	0.79x	1.8 to 3.8	2020-2024
Stomach	Deaths	2	2.7	0.74x	1.2 to 3	2020-2024
Stomach	New cases	4.8	6.6	0.73x	3.6 to 6.4	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 St. Clair County
Measure	County	U.S. median	Difference	Unit
Premature death	9,609.1	9,842.6	-2%	years of life lost before age 75 per 100,000
Life expectancy	75	75.3	-0%	years
Child mortality	59.2	59.8	-1%	deaths under age 18 per 100,000
Infant mortality	6.4	6.2	+3%	deaths under age 1 per 1,000 live births
Injury deaths	96.1	96.9	-1%	deaths per 100,000
Drug overdose deaths	34.2	28.6	+20%	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.

Formaldehyde13.48 per million
Carbon Tetrachloride2.98 per million
Benzene1.49 per million
Acetaldehyde1.34 per million

EPA Air Quality Index 2025

Monitored on 365 days: 254 good, 11 unhealthy for sensitive groups or worse. Median AQI 39, peak 152.

Regulated facilities, sites and hazards by type

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

Rail grade crossing188
NPDES wastewater discharge permit157
Industrial wastewater discharge99
Brownfield property78
Gas station (mapped facility)70
Air permit holder (minor source)51
Small hazardous waste generator26
Toxic chemical release facility (TRI)22
Auto repair or body shop (mapped facility)18
TRI reporting facility18
Major air pollution source9
Public airport8
Combined sewer overflow outfall7
Large greenhouse gas emitter7
Large hazardous waste generator7
Heliport6
Gas power plant4
Hazardous waste transporter3
EPA air quality monitor2
Coal power plant2
Wastewater plant (mapped facility)2
Commercial airport1
Biomass power plant1
Solar power plant1

Highest-severity records

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

Dte Electric Co-Belle River Power Plant, China Township
Toxic chemical release facility (TRI). Chemicals: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Barium And Barium Compounds, Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) and 4 more. Reports carcinogens. 9,974,688 lbs released over 5 years.
TRI facility ID 48054DTRTD4505K (U.S. EPA Toxics Release Inventory)
Severity 9.9
Intertape Polymer Group, Marysville
TRI reporting facility.
EPA FRS registry ID 110000404615 (U.S. EPA ECHO) Agency record
Severity 9.7
Marysville Ethanol Llc, Marysville
Toxic chemical release facility (TRI). Chemicals: Acetaldehyde, n-Hexane, Formaldehyde, Acrolein and 1 more. Reports carcinogens. 74,181 lbs released over 5 years.
TRI facility ID 4804WMRYSV251BU (U.S. EPA Toxics Release Inventory)
Severity 8.2
Kksp Precision Machining, East China
Toxic chemical release facility (TRI). Chemicals: Dichloromethane. Reports carcinogens. 64,220 lbs released over 5 years.
TRI facility ID 48054KKSCR65HAT (U.S. EPA Toxics Release Inventory)
Severity 8.2
Intertape Polymer Group, Marysville
Toxic chemical release facility (TRI). Chemicals: Toluene, Zinc compounds. 3,783,997 lbs released over 5 years.
TRI facility ID 48040MRCNT317KE (U.S. EPA Toxics Release Inventory)
Severity 8
Sunsation Products Inc, Clay Township
Toxic chemical release facility (TRI). Chemicals: Styrene, Methyl methacrylate. Reports carcinogens. 41,540 lbs released over 5 years.
TRI facility ID 48001SNSTN9666K (U.S. EPA Toxics Release Inventory)
Severity 8
Magna Electric Vehicle Structures, Saint Clair
Toxic chemical release facility (TRI). Chemicals: Certain glycol ethers, Manganese, Copper, Diisocyanates and 2 more. Reports carcinogens. 40,022 lbs released over 5 years.
TRI facility ID 4807WMGNLC1811S (U.S. EPA Toxics Release Inventory)
Severity 8
Michigan Metal Coatings, Port Huron
Toxic chemical release facility (TRI). Chemicals: Methanol, Manganese, Chromium, Copper and 3 more. Reports carcinogens. 20,852 lbs released over 5 years.
TRI facility ID 48060STVNS2015D (U.S. EPA Toxics Release Inventory)
Severity 7.8
Belle River, China Twp
Coal power plant.
Record ID 6034 (U.S. Energy Information Administration)
Severity 7.5
Smr-Automotive Systems Usa Inc., Marysville
Toxic chemical release facility (TRI). Chemicals: Xylene (mixed isomers), 1,2,4-Trimethylbenzene, Ethylbenzene, Methyl isobutyl ketone. Reports carcinogens. 4,869 lbs released over 5 years.
TRI facility ID 48040SCHFN1875B (U.S. EPA Toxics Release Inventory)
Severity 7.3
Belle River Berm Project, China
TRI reporting facility.
EPA FRS registry ID 110017414038 (U.S. EPA ECHO) Agency record
Severity 7.2
St Clair, East China Twp
Coal power plant.
Record ID 1743 (U.S. Energy Information Administration)
Severity 7.1
Iac, St Clair
TRI reporting facility.
EPA FRS registry ID 110057981313 (U.S. EPA ECHO) Agency record
Severity 7
Marysville Hydrocarbons, Llc., Marysville
TRI reporting facility. Penalties $6,480.
EPA FRS registry ID 110070028928 (U.S. EPA ECHO) Agency record
Severity 6.9
Michigan Metal Coatings Plant 2, Port Huron
Toxic chemical release facility (TRI). Chemicals: Manganese, Chromium, Copper, Nickel and 2 more. Reports carcinogens. 786 lbs released over 5 years.
TRI facility ID 4806WMCHGN172DV (U.S. EPA Toxics Release Inventory)
Severity 6.7
Mueller Brass Co, Port Huron
Toxic chemical release facility (TRI). Chemicals: Zinc compounds, Copper compounds, Manganese, Lead compounds and 1 more. 67,612 lbs released over 5 years.
TRI facility ID 48060MLLRB1925L (U.S. EPA Toxics Release Inventory)
Severity 6.7
Intertape Polymer Group, Marysville
Major air pollution source.
EPA FRS registry ID 110000404615 (U.S. EPA ECHO) Agency record
Severity 6.5
Pregis Marysville, Marysville
Major air pollution source.
EPA FRS registry ID 110022919430 (U.S. EPA ECHO) Agency record
Severity 6.5
Blue Water Renewables (P0262), Smiths Creek
Major air pollution source.
EPA FRS registry ID 110045008326 (U.S. EPA ECHO) Agency record
Severity 6.5
Mueller Brass Co., Port Huron
TRI reporting facility.
EPA FRS registry ID 110000404848 (U.S. EPA ECHO) Agency record
Severity 6.1
Magna Electric Vehicle Structures, Saint Clair
TRI reporting facility.
EPA FRS registry ID 110071434205 (U.S. EPA ECHO) Agency record
Severity 6
Dte Electric Company - Greenwood Energy Center, Avoca
Major air pollution source.
EPA FRS registry ID 110000404517 (U.S. EPA ECHO) Agency record
Severity 6
Intertape Polymer Group, Marysville
Large hazardous waste generator.
EPA FRS registry ID 110000404615 (U.S. EPA ECHO) Agency record
Severity 6
Intertape Polymer Group, Marysville
NPDES wastewater discharge permit.
EPA FRS registry ID 110000404615 (U.S. EPA ECHO) Agency record
Severity 6
Marine City Wwtp, Marine City
NPDES wastewater discharge permit.
EPA FRS registry ID 110000733190 (U.S. EPA ECHO) Agency record
Severity 6

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 St. Clair County

Michigan 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 St. Clair County, and their findings.
Michigan vital statistics office
Death certificate counts by cause of death and residence tract or ZIP code, and the years behind the mortality measures above.
Michigan health department, environmental epidemiology
Health consultations or assessments by ATSDR or the state health department covering the county, and any exposure investigations.
Michigan 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.
Michigan 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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