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Trinity County, California: environmental and disease records

Cancer mortality in Trinity County is 84.9 deaths per 100,000 people per year against a U.S. rate of 143.2. Federal databases place 112 regulated facilities, sites and hazards inside the county, led by NPDES wastewater discharge permit (46), Small hazardous waste generator (17), Wastewater plant (mapped facility) (10). 2 correctional facilities operate in the county. 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: 40.6709, -123.1435.

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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 Trinity County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Melanoma of the skin	New cases	23.6	23.8	0.99x	13.8 to 37.8	2019-2023
Lung & bronchus	New cases	38.6	51.8	0.75x	29 to 51.4	2019-2023
Non-Hodgkin lymphoma	New cases	13.6	18.5	0.74x	8 to 22.9	2019-2023
Lung & bronchus	Deaths	21.3	30.2	0.71x	14.8 to 31.2	2020-2024
All cancer	New cases	271.7	453.4	0.6x	241.3 to 305.3	2019-2023
All cancer	Deaths	84.9	143.2	0.59x	70.3 to 102.5	2020-2024
Bladder	New cases	10.5	18.7	0.56x	5.7 to 19	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 Trinity County
Measure	County	U.S. median	Difference	Unit
Premature death	12,353.9	9,842.6	+26%	years of life lost before age 75 per 100,000
Life expectancy	77	75.3	+2%	years
Child mortality	159	59.8	+166%	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	181.5	96.9	+87%	deaths per 100,000
Drug overdose deaths	25	28.6	-13%	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.

Formaldehyde19.98 per million
Acetaldehyde3.1 per million
Carbon Tetrachloride2.69 per million
Naphthalene2.43 per million

EPA Air Quality Index 2025

Monitored on 332 days: 231 good, 2 unhealthy for sensitive groups or worse. Median AQI 31, peak 164.

Regulated facilities, sites and hazards by type

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

NPDES wastewater discharge permit46
Small hazardous waste generator17
Wastewater plant (mapped facility)10
Gas station (mapped facility)8
Public airport7
Large hazardous waste generator7
Hydroelectric plant5
Industrial wastewater discharge4
Hazardous waste transporter3
EPA air quality monitor2
Correctional facility (prison or jail)2
Brownfield property1

Highest-severity records

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

Eagle Rock Inc, Weaverville
NPDES wastewater discharge permit.
EPA FRS registry ID 110070087274 (U.S. EPA ECHO) Agency record
Severity 4
Neal & Wendi Mckenny Mini Storage Phase 1, Cutten
NPDES wastewater discharge permit.
EPA FRS registry ID 110070087172 (U.S. EPA ECHO) Agency record
Severity 3.8
Former Sierra Pacific Lumber Mill, Hayfork
Brownfield property.
EPA FRS registry ID 110071975175 (U.S. EPA Brownfields (ACRES)) Agency record
Severity 3
Cal Trans Weaverville Maint Stn, Weaverville
Large hazardous waste generator.
EPA FRS registry ID 110008277104 (U.S. EPA ECHO) Agency record
Severity 3
Cal Trans Trintity Center Maint Stn, Trinity Center
Large hazardous waste generator.
EPA FRS registry ID 110008277113 (U.S. EPA ECHO) Agency record
Severity 3
Cal Trans Hayfork Maint Stn, Hayfork
Large hazardous waste generator.
EPA FRS registry ID 110008280261 (U.S. EPA ECHO) Agency record
Severity 3
Pacific Bell, Lewiston
Large hazardous waste generator.
EPA FRS registry ID 110008290964 (U.S. EPA ECHO) Agency record
Severity 3
Caltrans- District 2 Construction Project Ea02-0 1204, Weaverville
Large hazardous waste generator.
EPA FRS registry ID 110042154566 (U.S. EPA ECHO) Agency record
Severity 3
Cdf&W Trinity River Hatchery, Lewiston
NPDES wastewater discharge permit.
EPA FRS registry ID 110066375381 (U.S. EPA ECHO) Agency record
Severity 3
Cvs Pharmacy #9973, Weaverville
Large hazardous waste generator.
EPA FRS registry ID 110071678329 (U.S. EPA ECHO) Agency record
Severity 3
Chevron Weaverville, Weaverville
Large hazardous waste generator.
EPA FRS registry ID x1e7588806e07446e6fcdc4be84d4521e (U.S. EPA ECHO) Agency record
Severity 3
Hayfork, Hayfork
Public airport. O.
Record ID F62 (FAA / U.S. DOT)
Severity 2
Hyampom, Hyampom
Public airport. O.
Record ID H47 (FAA / U.S. DOT)
Severity 2
Lonnie Pool Fld/Weaverville, Weaverville
Public airport. O.
Record ID O54 (FAA / U.S. DOT)
Severity 2
Trinity Center, Trinity Center
Public airport. O.
Record ID O86 (FAA / U.S. DOT)
Severity 2
Ruth, Ruth
Public airport. O.
Record ID T42 (FAA / U.S. DOT)
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/711541434 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/884728396 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91372302 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91372896 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91374759 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91374970 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91375333 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91376000 (OpenStreetMap contributors) Agency record
Severity 2
Wastewater Plant
Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.
Record ID way/91376002 (OpenStreetMap contributors) Agency record
Severity 2

Correctional facilities

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

Trinity County Sheriffs Detention Facility, Weaverville
EPA FRS registry ID
xa78f8dc38aee6922c69003623af4649d
Wastewater permit
Yes
EPA detailed facility report
02 3e7904 Collins Bar Curve Correction, Burnt Ranch
EPA FRS registry ID
xc824f4bfb9a7d5ede8c2b7585d8d7028
Wastewater permit
Yes
EPA detailed facility report

Discovery / public records

Records to request for Trinity County

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