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Ada County, Idaho: environmental and disease records

Cancer mortality in Ada County is 130.8 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 and Brain & nervous system deaths at 1.2 times the U.S. rate. Federal databases place 2,696 regulated facilities, sites and hazards inside the county, led by Industrial wastewater discharge (1,226), NPDES wastewater discharge permit (719), Air permit holder (minor source) (250). 4 correctional facilities operate in the county, at least one with health-based drinking water violations on record. EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 40 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: 43.4596, -116.2342.

How this county ranks in Idaho

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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 Ada 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	33.9	23.8	1.42xSignificant	31.8 to 36.1	2019-2023
Melanoma of the skin	Deaths	2.7	2	1.35xSignificant	2.1 to 3.3	2020-2024
Brain & nervous system	Deaths	5.4	4.4	1.23xSignificant	4.6 to 6.3	2020-2024
Brain & nervous system	New cases	7.6	6.2	1.23xSignificant	6.6 to 8.7	2019-2023
Leukemia	Deaths	6.9	5.7	1.21xSignificant	5.9 to 7.9	2020-2024
Thyroid	Deaths	0.6	0.5	1.2x	0.4 to 1	2020-2024
Leukemia	New cases	17.1	14.5	1.18xSignificant	15.6 to 18.7	2019-2023
Kidney & renal pelvis	Deaths	3.7	3.4	1.09x	3 to 4.4	2020-2024
Bladder	New cases	19.3	18.7	1.03x	17.7 to 21	2019-2023
Esophagus	Deaths	3.8	3.7	1.03x	3.1 to 4.6	2020-2024
Non-Hodgkin lymphoma	New cases	19	18.5	1.03x	17.4 to 20.7	2019-2023
Pancreas	Deaths	11.4	11.3	1.01x	10.3 to 12.7	2020-2024
All cancer	New cases	455.3	453.4	1x	447.5 to 463.2	2019-2023
Esophagus	New cases	4.6	4.6	1x	3.8 to 5.4	2019-2023
Kidney & renal pelvis	New cases	17.7	17.9	0.99x	16.2 to 19.4	2019-2023
Pancreas	New cases	13.6	13.9	0.98x	12.3 to 15.1	2019-2023
All cancer	Deaths	130.8	143.2	0.91x	126.7 to 135	2020-2024
Bladder	Deaths	3.7	4.1	0.9x	3.1 to 4.5	2020-2024
Thyroid	New cases	11.7	13	0.9x	10.4 to 13	2019-2023
Non-Hodgkin lymphoma	Deaths	4.2	4.8	0.88x	3.5 to 5	2020-2024
Childhood cancer (under 15)	New cases	14	16.4	0.85x	10.8 to 17.9	2019-2023
Liver & bile duct	Deaths	5.6	6.6	0.85x	4.8 to 6.5	2020-2024
Lung & bronchus	New cases	41.6	51.8	0.8x	39.3 to 44	2019-2023
Liver & bile duct	New cases	6.9	8.7	0.79x	6 to 8	2019-2023
Lung & bronchus	Deaths	23.2	30.2	0.77x	21.5 to 25	2020-2024
Stomach	New cases	3.9	6.6	0.59x	3.2 to 4.7	2019-2023
Stomach	Deaths	1.4	2.7	0.52x	1 to 1.9	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 Ada County
Measure	County	U.S. median	Difference	Unit
Premature death	5,738.3	9,842.6	-42%	years of life lost before age 75 per 100,000
Life expectancy	79.7	75.3	+6%	years
Child mortality	42.3	59.8	-29%	deaths under age 18 per 100,000
Infant mortality	4.6	6.2	-26%	deaths under age 1 per 1,000 live births
Injury deaths	67.1	96.9	-31%	deaths per 100,000
Drug overdose deaths	19.6	28.6	-31%	deaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 40 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

Formaldehyde19.75 per million
Naphthalene4.95 per million
Acetaldehyde2.92 per million
Carbon Tetrachloride2.74 per million

EPA Air Quality Index 2025

Monitored on 365 days: 270 good, 0 unhealthy for sensitive groups or worse. Median AQI 42, peak 97.

Regulated facilities, sites and hazards by type

2,696 active records inside the county from EPA ECHO, TRI, Superfund, Brownfields, NPDES, EIA, FAA, FRA and corrections data.

Industrial wastewater discharge1,226
NPDES wastewater discharge permit719
Air permit holder (minor source)250
Gas station (mapped facility)150
Auto repair or body shop (mapped facility)90
Rail grade crossing72
Small hazardous waste generator57
Brownfield property43
Toxic chemical release facility (TRI)17
TRI reporting facility16
Dry cleaner (mapped facility)9
Hazardous waste transporter6
Hydroelectric plant6
Public airport5
Major air pollution source4
Correctional facility (prison or jail)4
Large hazardous waste generator4
Heliport4
EPA air quality monitor3
Large greenhouse gas emitter2
Solar power plant2
Scrapyard (mapped facility)2
Wastewater plant (mapped facility)2
Commercial airport1
Landfill (mapped facility)1
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.

Army National Guard Orchard Combat Training Center Ranges, Boise
TRI reporting facility.
EPA FRS registry ID 110067128753 (U.S. EPA ECHO) Agency record
Severity 8.8
Marathon Pipe Line - Boise, Boise
Toxic chemical release facility (TRI). Chemicals: n-Hexane, Toluene, Benzene, Xylene (mixed isomers) and 4 more. Reports carcinogens. 18,424 lbs released over 5 years.
TRI facility ID 83706NRTHW201NP (U.S. EPA Toxics Release Inventory)
Severity 7.8
Icco Eagle, Eagle
Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead. Reports carcinogens. 12,182 lbs released over 5 years.
TRI facility ID 83616CCGLX2755E (U.S. EPA Toxics Release Inventory)
Severity 7.6
Cs Beef Packers, Kuna
Toxic chemical release facility (TRI). Chemicals: Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid. 374,233 lbs released over 5 years.
TRI facility ID 8363WCSBFP17365 (U.S. EPA Toxics Release Inventory)
Severity 7.3
Micron Technology Inc, Boise
Toxic chemical release facility (TRI). Chemicals: Ammonia, Hydrogen fluoride, Nitric acid, Fluorine and 4 more. 364,792 lbs released over 5 years.
TRI facility ID 83706MCRNT2805E (U.S. EPA Toxics Release Inventory)
Severity 7.3
Cs Beef Packers, Kuna
TRI reporting facility. Penalties $2,000.
EPA FRS registry ID 110066854425 (U.S. EPA ECHO) Agency record
Severity 7.3
Boise Facility, Boise
Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Polycyclic aromatic compounds, Lead And Lead Compounds, Benzo[g,h,i]perylene and 1 more. Reports carcinogens. 2,534 lbs released over 5 years.
TRI facility ID 83709BSSPH545WG (U.S. EPA Toxics Release Inventory)
Severity 7.1
Kuna North Wwtp, Meridian
NPDES wastewater discharge permit. Penalties $114,880.
EPA FRS registry ID 110064606528 (U.S. EPA ECHO) Agency record
Severity 7
Army National Guard Orchard Combat Training Center Ranges, Boise
Toxic chemical release facility (TRI). Chemicals: Copper, Lead And Lead Compounds, Nitroglycerin. 141,140 lbs released over 5 years.
TRI facility ID 8370WRCHRD4715S (U.S. EPA Toxics Release Inventory)
Severity 7
Imc East Boise, Boise
Toxic chemical release facility (TRI). Chemicals: Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead. Reports carcinogens. 1,494 lbs released over 5 years.
TRI facility ID 83716STKRP155EA (U.S. EPA Toxics Release Inventory)
Severity 6.9
Micron Technology, Inc., Boise
TRI reporting facility.
EPA FRS registry ID 110017051820 (U.S. EPA ECHO) Agency record
Severity 6.6
Basalite Concrete Products, Meridian
TRI reporting facility.
EPA FRS registry ID 110040366868 (U.S. EPA ECHO) Agency record
Severity 6
West Boise Wwtp, Garden City
NPDES wastewater discharge permit.
EPA FRS registry ID 110000517824 (U.S. EPA ECHO) Agency record
Severity 5.8
Star Wwtp, Star
NPDES wastewater discharge permit.
EPA FRS registry ID 110009726010 (U.S. EPA ECHO) Agency record
Severity 5.8
Idaho Materials And Construction, Eagle
TRI reporting facility.
EPA FRS registry ID 110015583046 (U.S. EPA ECHO) Agency record
Severity 5.7
Marathon Pipe Line Boise Terminal, Boise
TRI reporting facility.
EPA FRS registry ID 110000773280 (U.S. EPA ECHO) Agency record
Severity 5.6
Lander Street Wwtp, Boise
NPDES wastewater discharge permit.
EPA FRS registry ID 110000916135 (U.S. EPA ECHO) Agency record
Severity 5.5
Idaho Concrete Company, Boise
TRI reporting facility.
EPA FRS registry ID 110015583064 (U.S. EPA ECHO) Agency record
Severity 5.5
Boise Air Trml/Gowen Fld, Boise
Commercial airport. O.
Record ID BOI (FAA / U.S. DOT)
Severity 5
Knife River Mountain West, Boise
TRI reporting facility.
EPA FRS registry ID 110064845477 (U.S. EPA ECHO) Agency record
Severity 4.8
Darigold Boise, Boise
TRI reporting facility.
EPA FRS registry ID 110000468690 (U.S. EPA ECHO) Agency record
Severity 4.7
Darigold-Boise, Boise
Toxic chemical release facility (TRI). Chemicals: Nitric acid, Peracetic acid, Nitrate compounds (water dissociable; reportable only when in aqueous solution). 145 lbs released over 5 years.
TRI facility ID 83704DRGLD618AL (U.S. EPA Toxics Release Inventory)
Severity 4.7
Sunroc Corp - Joplin Facility, Boise
Toxic chemical release facility (TRI). Chemicals: Lead, Nitrate compounds (water dissociable; reportable only when in aqueous solution). Reports carcinogens.
TRI facility ID 8371WSNRCC1988J (U.S. EPA Toxics Release Inventory)
Severity 4.6
Sunroc Corp - Corral Asphalt Plant, Boise
Toxic chemical release facility (TRI). Chemicals: Polycyclic aromatic compounds. Reports carcinogens.
TRI facility ID 8363WSNRCC11795 (U.S. EPA Toxics Release Inventory)
Severity 4.6
Basalite, Meridian
Toxic chemical release facility (TRI). Chemicals: Lead And Lead Compounds, Lead. Reports carcinogens.
TRI facility ID 8364WBSLTX13EFR (U.S. EPA Toxics Release Inventory)
Severity 4.5

Correctional facilities

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

Idaho Correction Alternative Placement, Kuna
EPA FRS registry ID
110054035227
Water system
ID4010255
Health-based violations
1 all time, 0 in 5 years
All violations
11
Contaminants cited
Groundwater Rule
Wastewater permit
None on record
EPA detailed facility report
Idaho State Correctional Institution, Kuna
EPA FRS registry ID
110007514993
Wastewater permit
None on record
EPA detailed facility report
Idaho State Correctional Center, Kuna
EPA FRS registry ID
110068077191
Wastewater permit
None on record
EPA detailed facility report
Idoc Women'S & Men'S Prison, Kuna
EPA FRS registry ID
110072084902
Wastewater permit
Yes
EPA detailed facility report

Discovery / public records

Records to request for Ada County

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