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Public environmental health records for water, air, land, infrastructure, incidents, and community indicators.
Toxin Scout summarizes public records from government and public datasets. Data can be delayed, incomplete, approximate, matched at non-parcel levels, or have accuracy problems as a result of this product's beta status, so verify important findings against the linked source records.
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Preparing Thornton environmental records...
Drinking water compliance, PFAS records, natural water body health, discharge permits, and water-quality monitoring records for Thornton.
Public water-system records for Thornton, CO from EPA SDWIS.
Thornton City of
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 226,465 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Feb 2023 to Nov 2023.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
4 PFAS sample results above EPA limits
Sample period: Feb 2023 to May 2023
UCMR5 results are sampled by public water system, not every household. Confirm your water provider before treating these as tap-water results for a specific address.
| Chemical | Concentration (µg/L) | EPA Limit (µg/L) | Sample date | Over Limit |
|---|---|---|---|---|
| PFOA | 0.0071 | 0.0040 | 2023-02-14 | Yes |
| PFOA | 0.0065 | 0.0040 | 2023-05-30 | Yes |
| PFOS | 0.0050 | 0.0040 | 2023-02-14 | Yes |
| PFOS | 0.0045 | 0.0040 | 2023-05-30 | Yes |
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Thornton drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation site records surfaced within the search radius.
No health-relevant impaired water body records surfaced within 10 km in EPA ATTAINS.
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Last inspected: Dec 2025
Data from EPA ECHO
Reviewed: source records as of Jan 5005
Air quality data from EPA monitoring stations, facility emissions inventories, and area-level air-quality designations in this city.
Adams County
Reported: Dec 2020
EPA national average is ~30 per million
According to EPA, a cancer risk of 40-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 40 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top local emission sources
Data from EPA AirToxScreen
EPA designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
Denver Metro/North Front Range: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Original designation: Jun 2026
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Denver-Boulder-Greeley-Ft. Collins-Loveland: Ozone
NonattainmentSevere 158-Hour Ozone (2008 Standard)
Original designation: Jul 2012
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Adams, Denver, and Boulder Counties; Denver Metropolitan Area
PM10 · PM-10 (1987 Standard)
Classification: Moderate
Original designation: Nov 1990
Data from EPA Green Book
Boulder Reservoir
Annual mean: 0.0 ppm · EPA standard: 0.07 ppm
Annual standard context: 10 exceedance days recorded in the reporting period
Reported: Mar 2026
Highland Reservoir — Southglenn, Colorado
Annual mean: 0.0 ppm · EPA standard: 0.07 ppm
Annual standard context: 6 exceedance days recorded in the reporting period
Reported: Mar 2026
National Renewable Energy Labs - Nrel — Applewood, Colorado
Annual mean: 0.1 ppm · EPA standard: 0.07 ppm
Annual standard context: 26 exceedance days recorded in the reporting period
Reported: Mar 2026
Data from EPA AQS
Reviewed: source records as of Q4 2025
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Atlas Roofing Corp
Reported: 2024
B&B Blending LLC
Reported: 2024
Brannan Sand & Gravel- Central Ready Mix
Reported: 2024
Contaminated sites, waste facilities, cleanup records, and industrial operations in this city.
Reviewed: source query run Jun 2026
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO1 site with active cleanup or investigation status
9010 Poze Blvd, Thornton
Reported: Feb 2026
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No underground storage tank records with active/open release status surfaced within 2 miles.
Data from EPA UST Finder
Reviewed: reporting year 2024
Sites regulated by the Mine Safety and Health Administration, including mines, sand and gravel operations, and portable crushers. Status and type are from the MSHA Mine Data Retrieval System. Records with active/intermittent status dates older than 5 years are shown as older records rather than current active sites.
Recently updated active/intermittent sites (1)
Data from MSHA
FracFocus Chemical Disclosure Registry — national registry of chemicals used in hydraulic fracturing operations, as reported by operators to the Ground Water Protection Council and Interstate Oil and Gas Compact Commission.
FracFocus well disclosures (3)
Data from FracFocus
Adams County, CO
Reported: Mar 2026
Adams County is EPA Radon Zone 1 (highest potential). EPA defines Zone 1 counties as having predicted average indoor screening levels above 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
Flood-map status, chemical accident risk, nuclear facilities, pipeline incidents, and community health indicators in this city.
FEMA's National Flood Hazard Layer maps flood risk. Properties in a Special Flood Hazard Area are required to carry flood insurance if they have a federally backed mortgage.
Special Flood Hazard Area — 1% annual chance of flooding (100-year floodplain) with base flood elevation.
Risk Management Program facilities handle extremely hazardous substances (e.g., chlorine, ammonia, propane). EPA requires these facilities to plan for worst-case chemical releases.
No facility records with recent chemical accidents surfaced for this property within the last five years.
Data from EPA ECHO
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
No pipeline incident records surfaced for this city report in the last 5 years.
Reviewed: last 5 years
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Adams County, ColoradoPop. 527,575
Reported: Mar 2026
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking Water Violations
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 7,653 | 6,994 | 7,972 |
| Poor or Fair Health | 16.2% | 12.8% | 14.2% |
| Poor Physical Health Days | 3.8 | 3.1 | 3.3 |
| Poor Mental Health Days | 5.0 | 4.8 | 4.8 |
| Adult Smoking | 15.3% | 12.1% | 15.0% |
| Adult Obesity | 31.3% | 25.1% | 34.0% |
| Air Pollution - Particulate Matter | 9.1 | 4.5 | 7.3 |
| Drinking Water Violations | 1 | 1 | N/A |
| Diabetes Prevalence | 8.5% | 6.5% | 9.6% |
| Life Expectancy | 77.5 | 79.0 | 77.6 |