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San Juan County, Colorado: environmental and disease records

County cancer statistics are not published for San Juan County. Federal databases place 44 regulated facilities, sites and hazards inside the county, led by Industrial wastewater discharge (17), NPDES wastewater discharge permit (10), Brownfield property (6). EPA AirToxScreen estimates a lifetime cancer risk from outdoor air toxics of 10 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: 37.8019, -107.6465.

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.

No county-level cancer statistics are published for this area. Request counts directly from the Colorado state cancer registry.

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 San Juan County
MeasureCountyU.S. medianDifferenceUnit
Premature deathn/a9,842.6n/ayears of life lost before age 75 per 100,000
Life expectancyn/a75.3n/ayears
Child mortalityn/a59.8n/adeaths under age 18 per 100,000
Infant mortalityn/a6.2n/adeaths under age 1 per 1,000 live births
Injury deathsn/a96.9n/adeaths per 100,000
Drug overdose deathsn/a28.6n/adeaths per 100,000

Air toxics and air quality

EPA AirToxScreen 2020

Lifetime cancer risk from outdoor air toxics: 10 in a million. EPA treats 100 in a million as the upper end of acceptable risk and 1 in a million as the goal.

  • Formaldehyde7.98 per million
  • Carbon Tetrachloride2.08 per million
  • Naphthalene0.83 per million
  • Pahpom0.62 per million

EPA Air Quality Index 2025

Monitored on 92 days: 91 good, 0 unhealthy for sensitive groups or worse. Median AQI 12, peak 57.

Regulated facilities, sites and hazards by type

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

  • Industrial wastewater discharge17
  • NPDES wastewater discharge permit10
  • Brownfield property6
  • Heliport3
  • Wastewater plant (mapped facility)3
  • Air permit holder (minor source)2
  • EPA air quality monitor1
  • Gas station (mapped facility)1
  • Superfund (NPL) site1

Highest-severity records

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

  1. Bonita Peak Mining District, San Juan County

    Superfund (NPL) site. Hazard Ranking System score 50. NPL Site.

    EPA site ID CON000802497 (U.S. EPA Superfund (SEMS/NPL)) Agency record

    Severity 10

  2. Cascade Village Wwtf, Durango

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110010053609 (U.S. EPA ECHO) Agency record

    Severity 4.5

  3. Upper Animas Sand And Gravel Pit 1, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070054613 (U.S. EPA ECHO) Agency record

    Severity 4.5

  4. Upper Animas Sand And Gravel Pit 2, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070063578 (U.S. EPA ECHO) Agency record

    Severity 4.5

  5. Silverton Town Of, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110010054369 (U.S. EPA ECHO) Agency record

    Severity 3.3

  6. Martha Rose/Walsh Smelter, Silverton

    Brownfield property.

    EPA FRS registry ID 110060751878 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  7. Gladstone Treatment Plant, Gladstone

    Brownfield property.

    EPA FRS registry ID 110071967637 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  8. Zanoni Property, Silverton

    Brownfield property.

    EPA FRS registry ID 110071985637 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  9. Boxcar Apartment Site, Silverton

    Brownfield property.

    EPA FRS registry ID 110071992978 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  10. Lackawanna Mill Site, Silverton

    Brownfield property.

    EPA FRS registry ID 110071992979 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  11. Anvil Mountain Subdivision Affordable Housing Site, Silverton

    Brownfield property.

    EPA FRS registry ID 110072080166 (U.S. EPA Brownfields (ACRES)) Agency record

    Severity 3

  12. Silverton Town Of Wwtf, Silverton

    Industrial wastewater discharge. Violation Identified.

    NPDES permit CO0020311: (U.S. EPA NPDES)

    Severity 2.9

  13. Cascade Village Wwtf, Durango

    Industrial wastewater discharge. Violation Identified.

    NPDES permit CO0039691: (U.S. EPA NPDES)

    Severity 2.6

  14. Silverton Town Of, Silverton

    Industrial wastewater discharge. No Violation Identified.

    NPDES permit COG641008: (U.S. EPA NPDES)

    Severity 2.6

  15. Wastewater Plant

    Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.

    Record ID way/148781069 (OpenStreetMap contributors) Agency record

    Severity 2

  16. Wastewater Plant

    Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.

    Record ID way/148781070 (OpenStreetMap contributors) Agency record

    Severity 2

  17. Wastewater Plant

    Wastewater plant (mapped facility). Mapped facility presence only; no compliance or exposure measurements.

    Record ID way/148781071 (OpenStreetMap contributors) Agency record

    Severity 2

  18. Silverton Town Of, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110011372932 (U.S. EPA ECHO) Agency record

    Severity 1.5

  19. Tacoma Hydro Cascade Flowline Replacement, Durango

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110070940559 (U.S. EPA ECHO) Agency record

    Severity 1.5

  20. The Aerie Silverton, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110071338149 (U.S. EPA ECHO) Agency record

    Severity 1.5

  21. Silver Cloud, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110071401786 (U.S. EPA ECHO) Agency record

    Severity 1.5

  22. Us 550 Mp 59.3 Rockfall And Mp 56.9 Wall Replacement, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110071850721 (U.S. EPA ECHO) Agency record

    Severity 1.5

  23. Winnemmucca Mill Site, Silverton

    NPDES wastewater discharge permit.

    EPA FRS registry ID 110072076200 (U.S. EPA ECHO) Agency record

    Severity 1.5

  24. Silverton Trash, Silverton

    Air permit holder (minor source).

    EPA FRS registry ID 110041628487 (U.S. EPA ECHO) Agency record

    Severity 1

  25. Colorado Goldfields - Pride Of The West, Silverton 3.5 Mi. Ne Of

    Air permit holder (minor source).

    EPA FRS registry ID 110066860212 (U.S. EPA ECHO) Agency record

    Severity 1

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 San Juan 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 San Juan 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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