Contaminant 7500
Unresolved Volatile Organic Chemical Rule violation cited in 2025 (contaminant 7500).
City · TRI 2024
Prescott, Arizona Pollution
3 TRI facilities inside the city limits and 19 public water systems serving residents. In-city TRI releases rose by an order of magnitude year over year (+609%). Toxic releases concentrations have more than halved since 2010.
FIPS 0457380 · population 46,054 · Yavapai County
Anomaly engine
Notable Signals
Chlorine
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2024 (chlorine).
Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5200).
Contaminant 8000
Unresolved Revised Total Coliform Rule violation cited in 2024 (contaminant 8000).
Showing the 4 most editorially weighted signals out of 26. Lower-severity signals fold into the chemical breakdown and history charts below.
Pollutant pathways
Prescott Pollutant Multi-Year Trends
PM2.5 annual mean (NAAQS 9 µg/m³ (annual))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations are roughly unchanged from 2011.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have fallen 18% since 2011.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour))Health riskGround-level ozone (smog) forms when vehicle and industrial emissions react in sunlight. Inflames the airways, triggers asthma attacks, and worsens heart and lung disease.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations have fallen 10% since 2010.
Lifetime cancer risk all pollutants (100 in a million (EPA elevated threshold))Health riskEPA-modeled added cancer cases per million residents from a lifetime of breathing local air toxics. EPA flags 100-in-a-million as elevated.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Formaldehyde ambient mean (0.077 µg/m³ (1-in-a-million URE))Health riskAn air toxic emitted by refineries, wood products, and combustion. EPA classifies it as a known human carcinogen — long-term inhalation raises cancer risk.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Benzene ambient mean (0.13 µg/m³ (1-in-a-million URE))Health riskAn air toxic from gasoline, refineries, and tobacco smoke. A known human carcinogen — chronic exposure is linked to leukemia and other blood cancers.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
TRI air releases (5.1 fugitive + 5.2 stack)Health riskToxic chemicals reported by industrial facilities as released into the air — fugitive leaks plus smokestack emissions. Higher pounds means more inhaled exposure for nearby residents.
TRI air releases (5.1 fugitive + 5.2 stack) volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
TRI water releases (5.3)Health riskToxic chemicals reported by industrial facilities as discharged to surface waters (rivers, lakes, the ocean). Affects fishing, recreation, and downstream drinking-water intakes.
TRI water releases (5.3) volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
TRI land + off-site releasesHealth riskToxic chemicals released to land on-site or transferred off-site for disposal — landfills, deep-well injection, and similar. Risks groundwater contamination over time.
TRI land + off-site releases volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Greenhouse gases (GHGRP large emitters, through 2023)Health riskGreenhouse gases reported by large industrial emitters under EPA's GHGRP, in metric tons of CO₂ equivalent. Drives climate warming and the heat-related health effects that follow.
Greenhouse gases (GHGRP large emitters, through 2023) concentrations are up 86% since 2010.
Top facilities · TRI 2024
Largest Emitters Inside The City
| Facility | Top chemical | Total releases | YoY |
|---|---|---|---|
| Nestle Health Science USNestle Health Science US | Zinc compoundsHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR) | 1k lb | +418% |
| Sturm Ruger & CO INCSturm Ruger & Co INC | LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR) | 815 lb | +1578% |
| Martin Marietta Arizona LLC - Yavapai PlantMartin Marietta Materials INC | LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR) | 0 lb | +30% |
Drinking water · SDWIS
Water Systems Serving Prescott
126 unresolved violations on the SDWIS record across utilities serving this city.
19
Utilities serving
48,036
Population served
46
Health-based · 5yr
126
Unresolved
| Water system | PWSID | Population served | Health-based · 5yr | Status |
|---|---|---|---|---|
| White Horse Ranch Owners Association Mixed | AZ0413221 | 292 | 42 | UNRESOLVED |
| Prescott City Of Municipal | AZ0413045 | 42,217 | 1 | UNRESOLVED |
| American Ranch Dwid Mixed | AZ0413258 | 140 | 1 | UNRESOLVED |
| Pinehurst Water Company Private | AZ0413043 | 54 | 1 | UNRESOLVED |
| Rancho Vida Rv Park Private | AZ0413330 | 57 | 1 | Returned to compliance |
| Granite Oaks Water Users Association Private | AZ0413155 | 1,200 | 0 | UNRESOLVED |
| Ponderosa Park Dwid Private | AZ0413044 | 602 | 0 | UNRESOLVED |
| Inscription Canyon Water Company Municipal | AZ0413263 | 566 | 0 | UNRESOLVED |
| Bradshaw Water Company Inc Private | AZ0413141 | 510 | 0 | UNRESOLVED |
| Inscription Canyon Water Company Private | AZ0413303 | 507 | 0 | UNRESOLVED |
| Highland Pine Dwid Private | AZ0413034 | 450 | 0 | UNRESOLVED |
| Quail Ridge Dwid Private | AZ0413307 | 179 | 0 | UNRESOLVED |
| Beverly Gardens Trailer Park Private | AZ0413408 | 120 | 0 | UNRESOLVED |
| Jackson Acres Dwid Private | AZ0413036 | 30 | 0 | UNRESOLVED |
Showing the 14 systems with recorded health-based or unresolved violations. 5 additional systems are in compliance with no recorded health-based violations in the past 5 years and are not individually tabulated.
A public water systemis the regulated entity, not the city. EPA's SDWIS definition covers anything serving 25+ people for 60+ days a year or with 15+ service connections — that includes municipal utilities (City of Stockton), water districts, mobile home parks operating their own wells, schools, and small private subdivisions. Each system is independently monitored. Some systems serve multiple cities; some cities are served by many systems.
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Who Lives In Prescott
Prescott, Arizona (Census place block groups): 46,054 residents. City disparity score for pm2.5 (fine particulate) sits well below the reference (1). Why we surface this →
11.3%
Low-income
14.4%
People of color
2.8%
Under age 5
40.8%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.1below the national median
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.70above the national median
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.53near the national median
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.16below the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.14below the national median
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.40below the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.44near the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.56near the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.28below the national median
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.20below the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.80above the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.40below the national median
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.76above the national median
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 1 | well below the reference |
| Ozone | 86 | below the reference |
| Nitrogen dioxide (NO₂) | 51 | below the reference |
| Diesel particulate | 16 | well below the reference |
| Toxic releases (RSEI) | 11 | well below the reference |
| Traffic proximity | 39 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 28 | well below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 0 | well below the reference |
| Hazardous-waste site proximity | 13 | well below the reference |
| Underground storage tanks | 57 | below the reference |
| NPDES wastewater proximity | 26 | well below the reference |
| Drinking-water non-compliance | 6 | well below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror).
Health context
Co-Located Health Indicators
Modeled adult-prevalence estimates published by CDC PLACES, paired with this city's pollution and demographic context. Comparisons are ecological, not causal — pollution and disease prevalence covary at the area level, but the data does not attribute any individual's diagnosis to local exposure. How this section works →
Adult asthma (current)
10.5%
CDC PLACES · 2025 release · BRFSS 2022-2023
COPD prevalence
8.6%
CDC PLACES · 2025 release · BRFSS 2022-2023
Coronary heart disease
8.8%
CDC PLACES · 2025 release · BRFSS 2022-2023
Diabetes (diagnosed)
11.4%
CDC PLACES · 2025 release · BRFSS 2022-2023
Frequent mental distress
12.8%
CDC PLACES · 2025 release · BRFSS 2022-2023
PLACES uses BRFSS-modeled small-area estimates, not individual records. Crude prevalence shown above is the local rate as published; comparators are age-adjusted vs the Arizona mean and the US mean — both population-weighted across counties — so geographies with different age structures stay apples-to-apples. Sources: CDC PLACES · 2025 release · BRFSS 2022-2023.
Sources.
- EPA Toxics Release Inventory · retrieved 2026-05-07.
- EPA Safe Drinking Water Information System · retrieved 2026-05-07.