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Weld County, Colorado: environmental and disease records

Cancer mortality in Weld County is 128.7 deaths per 100,000 people per year against a U.S. rate of 143.2. The strongest disease signals are Melanoma of the skin deaths at 1.4 times the U.S. rate. Federal databases place 11,858 regulated facilities, sites and hazards inside the county, led by Air permit holder (minor source) (8,738), Industrial wastewater discharge (1,158), NPDES wastewater discharge permit (1,084). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 50 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: 40.4957, -104.5458.

How this county ranks in Colorado

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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 Weld County compared with the United States
Cancer	Measure	County rate	U.S. rate	Times U.S.	95% interval	Years
Melanoma of the skin	Deaths	2.8	2	1.4xSignificant	2.1 to 3.8	2020-2024
Non-Hodgkin lymphoma	Deaths	5.4	4.8	1.13x	4.3 to 6.7	2020-2024
Leukemia	New cases	15.7	14.5	1.08x	13.8 to 17.7	2019-2023
Childhood cancer (under 15)	New cases	16.7	16.4	1.02x	12.8 to 21.5	2019-2023
Melanoma of the skin	New cases	23.8	23.8	1x	21.5 to 26.2	2019-2023
Pancreas	Deaths	11.3	11.3	1x	9.7 to 13	2020-2024
Non-Hodgkin lymphoma	New cases	18.4	18.5	0.99x	16.4 to 20.7	2019-2023
Thyroid	New cases	12.9	13	0.99x	11.2 to 14.7	2019-2023
Leukemia	Deaths	5.6	5.7	0.98x	4.5 to 6.9	2020-2024
Bladder	New cases	18.3	18.7	0.98x	16.3 to 20.6	2019-2023
Stomach	Deaths	2.6	2.7	0.96x	1.9 to 3.5	2020-2024
Esophagus	New cases	4.4	4.6	0.96x	3.5 to 5.6	2019-2023
Liver & bile duct	New cases	8.2	8.7	0.94x	6.9 to 9.7	2019-2023
Liver & bile duct	Deaths	6.2	6.6	0.94x	5.1 to 7.5	2020-2024
Bladder	Deaths	3.8	4.1	0.93x	2.8 to 4.9	2020-2024
All cancer	Deaths	128.7	143.2	0.9x	123.2 to 134.4	2020-2024
Brain & nervous system	New cases	5.5	6.2	0.89x	4.4 to 6.7	2019-2023
Kidney & renal pelvis	Deaths	3	3.4	0.88x	2.3 to 4	2020-2024
All cancer	New cases	399.9	453.4	0.88x	390.3 to 409.6	2019-2023
Esophagus	Deaths	3.1	3.7	0.84x	2.3 to 4	2020-2024
Pancreas	New cases	11.4	13.9	0.82x	9.8 to 13.1	2019-2023
Kidney & renal pelvis	New cases	14.4	17.9	0.8x	12.7 to 16.4	2019-2023
Stomach	New cases	5.2	6.6	0.79x	4.1 to 6.4	2019-2023
Brain & nervous system	Deaths	3.4	4.4	0.77x	2.5 to 4.3	2020-2024
Lung & bronchus	New cases	36.9	51.8	0.71x	34 to 40	2019-2023
Lung & bronchus	Deaths	21.5	30.2	0.71x	19.4 to 23.9	2020-2024

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 Weld County
Measure	County	U.S. median	Difference	Unit
Premature death	6,882.5	9,842.6	-30%	years of life lost before age 75 per 100,000
Life expectancy	78.8	75.3	+5%	years
Child mortality	46.1	59.8	-23%	deaths under age 18 per 100,000
Infant mortality	4.3	6.2	-31%	deaths under age 1 per 1,000 live births
Injury deaths	80.5	96.9	-17%	deaths per 100,000
Drug overdose deaths	21.9	28.6	-24%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 50 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde30.89 per million
Benzene3.4 per million
Naphthalene2.99 per million
Acetaldehyde2.7 per million

EPA Air Quality Index 2025

Monitored on 365 days: 163 good, 6 unhealthy for sensitive groups or worse. Median AQI 52, peak 119.

Regulated facilities, sites and hazards by type

11,858 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

Air permit holder (minor source)8,738
Industrial wastewater discharge1,158
NPDES wastewater discharge permit1,084
Rail grade crossing254
Major air pollution source129
Gas station (mapped facility)121
Toxic chemical release facility (TRI)63
TRI reporting facility54
Auto repair or body shop (mapped facility)42
Brownfield property36
Small hazardous waste generator29
Public airport26
Large greenhouse gas emitter22
Large hazardous waste generator18
Solar power plant17
Scrapyard (mapped facility)17
EPA air quality monitor8
Heliport7
Landfill (mapped facility)7
Hazardous waste transporter6
Dry cleaner (mapped facility)5
Gas power plant5
Wind power plant3
Wastewater plant (mapped facility)3
Commercial airport2
Airfield1
Crematorium (mapped facility)1
Battery storage plant1
Biomass 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.

Roggen Gas Plant, Roggen
TRI reporting facility. Penalties $3,393,500.
EPA FRS registry ID 110015910031 (U.S. EPA ECHO) Agency record
Severity 9.8
Jbs Swift Beef Company, Greeley
TRI reporting facility. Penalties $92,225.
EPA FRS registry ID 110037942616 (U.S. EPA ECHO) Agency record
Severity 9.6
Golden Aluminum Inc. - Fort Lupton Mill, Fort Lupton
TRI reporting facility. Penalties $66,500.
EPA FRS registry ID 110000467539 (U.S. EPA ECHO) Agency record
Severity 9.3
Metal Container Corportion - Windsor Can Plant, Windsor
Toxic chemical release facility (TRI). Chemicals: n-Butyl alcohol, Certain glycol ethers, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrogen fluoride and 1 more. Reports carcinogens. 1,574,170 lbs released over 5 years.
TRI facility ID 80550MTLCN12011 (U.S. EPA Toxics Release Inventory)
Severity 9.3
Mewbourn Gas Plant, Platteville
TRI reporting facility.
EPA FRS registry ID 110010691750 (U.S. EPA ECHO) Agency record
Severity 9
Kodak Colorado Div, Windsor
TRI reporting facility. Penalties $119,000.
EPA FRS registry ID 110000467502 (U.S. EPA ECHO) Agency record
Severity 8.8
Afco Steel, Greeley
TRI reporting facility.
EPA FRS registry ID 110022515633 (U.S. EPA ECHO) Agency record
Severity 8.6
Boulder Scientific Co Llc - Mead Facility, Mead
Toxic chemical release facility (TRI). Chemicals: Methanol, Toluene, n-Hexane, Dichloromethane and 4 more. Reports carcinogens. 107,021 lbs released over 5 years.
TRI facility ID 80542BLDRS5983R (U.S. EPA Toxics Release Inventory)
Severity 8.4
Mewbourn Gas Plant, Gilcrest
Toxic chemical release facility (TRI). Chemicals: Cyclohexane, Formaldehyde, Benzene, Methanol and 4 more. Reports carcinogens. 83,559 lbs released over 5 years.
TRI facility ID 8062WMWBRN18455 (U.S. EPA Toxics Release Inventory)
Severity 8.3
Arc Colorado Inc., Longmont
Toxic chemical release facility (TRI). Chemicals: Trichloroethylene, 1-Bromopropane. Reports carcinogens. 70,582 lbs released over 5 years.
TRI facility ID 80504PRCSN74WEL (U.S. EPA Toxics Release Inventory)
Severity 8.2
Dcp Midstream O-Connor Gas Plant, Kersey
Toxic chemical release facility (TRI). Chemicals: Methanol, Cyclohexane, n-Hexane, Benzene and 4 more. Reports carcinogens. 70,101 lbs released over 5 years.
TRI facility ID 8064WDCPMD24189 (U.S. EPA Toxics Release Inventory)
Severity 8.2
Fort Lupton Gas Processing Plant, Fort Lupton
Toxic chemical release facility (TRI). Chemicals: Formaldehyde, n-Hexane, Acetaldehyde, Methanol and 4 more. Reports carcinogens. 69,748 lbs released over 5 years.
TRI facility ID 8062WFRTLP16157 (U.S. EPA Toxics Release Inventory)
Severity 8.2
Lucerne Plant, Greeley
Toxic chemical release facility (TRI). Chemicals: Cyclohexane, Methanol, Benzene, n-Hexane and 4 more. Reports carcinogens. 65,027 lbs released over 5 years.
TRI facility ID 8063WLCRNP31495 (U.S. EPA Toxics Release Inventory)
Severity 8.2
Golden Aluminum, Fort Lupton
Toxic chemical release facility (TRI). Chemicals: Xylene (mixed isomers), n-Butyl alcohol, Aluminum (fume or dust), Ethylbenzene and 4 more. Reports carcinogens. 38,335 lbs released over 5 years.
TRI facility ID 80621GLDNL1405E (U.S. EPA Toxics Release Inventory)
Severity 8
Platte Valley Gas Processing Plant, Fort Lupton
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Formaldehyde, Benzene, Toluene and 3 more. Reports carcinogens. 35,927 lbs released over 5 years.
TRI facility ID 8062WPLTTV16157 (U.S. EPA Toxics Release Inventory)
Severity 8
Leprino Foods Co - Greeley, Greeley
Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid, Peracetic acid, Ammonia. 2,001,140 lbs released over 5 years.
TRI facility ID 80631WSTRN13021 (U.S. EPA Toxics Release Inventory)
Severity 7.8
Roggen Plant, Roggen
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Cyclohexane, Toluene, Benzene and 4 more. Reports carcinogens. 21,150 lbs released over 5 years.
TRI facility ID 8065WRGGNP3549W (U.S. EPA Toxics Release Inventory)
Severity 7.8
Lancaster Gas Processing Plant, Fort Lupton
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Toluene, Benzene, Xylene (mixed isomers) and 2 more. Reports carcinogens. 15,573 lbs released over 5 years.
TRI facility ID 8062WLNCST1627C (U.S. EPA Toxics Release Inventory)
Severity 7.7
Front Range Energy, Windsor
Toxic chemical release facility (TRI). Chemicals: Acetaldehyde, Ammonia, Benzene, Nitric acid. Reports carcinogens. 15,216 lbs released over 5 years.
TRI facility ID 80550FRNTR31375 (U.S. EPA Toxics Release Inventory)
Severity 7.7
Dcp Midstream Lp - Spindle Gas Plant, Fort Lupton
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Cyclohexane, Methanol, Benzene and 4 more. Reports carcinogens. 9,674 lbs released over 5 years.
TRI facility ID 8062WDCPMD911CU (U.S. EPA Toxics Release Inventory)
Severity 7.6
Fort Lupton / Platte Valley / Lancaster Complex, Fort Lupton
Major air pollution source. Penalties $3,671,675.
EPA FRS registry ID 110002052974 (U.S. EPA ECHO) Agency record
Severity 7.5
Dcp Operating Co - Enterprise C.S., Kersey
Major air pollution source. Penalties $132,834.
EPA FRS registry ID 110010437884 (U.S. EPA ECHO) Agency record
Severity 7.5
Roggen Gas Plant, Roggen
Major air pollution source. Penalties $3,393,500.
EPA FRS registry ID 110015910031 (U.S. EPA ECHO) Agency record
Severity 7.5
Jbs Swift Beef Company, Greeley
Major air pollution source. Penalties $92,225.
EPA FRS registry ID 110037942616 (U.S. EPA ECHO) Agency record
Severity 7.5
Dcp Operating Co - Lucerne 2 Gas Plant, Greeley Area
Major air pollution source. Penalties $3,965,281.
EPA FRS registry ID 110071722436 (U.S. EPA ECHO) Agency record
Severity 7.5

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 Weld County

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