Transparency
Where Our Data Comes From.
14 federal data sources. 74+ indicators. Refreshed daily via automated pipelines. We publish this page because you shouldn't have to take our word for it.
Last pipeline run: April 17, 2026
Environmental
Air, water, soil, and climate exposure from EPA and NOAA. These are the upstream drivers that the epidemiological literature links to downstream health outcomes.
EPA Air Quality System (AQS)
Environmental Protection Agency
Ambient pollutant concentrations from the national monitoring network. PM2.5, ozone, NO2, and SO2 annual averages by county.
Indicators
PM2.5, Ozone, NO2, SO2
Data vintage
2016–2025
Refresh
Monthly
EPA EJSCREEN
Environmental Protection Agency
Population-weighted modeled estimates of environmental exposure at the census tract level, aggregated to county. Fills the gaps where AQS monitors don't exist.
Indicators
Modeled PM2.5, Ozone, Diesel PM, Traffic proximity, Superfund/TSDF/UST proximity, Wastewater discharge, Drinking water violations
Data vintage
2024
Refresh
Quarterly
EPA Toxics Release Inventory (TRI)
Environmental Protection Agency
Chemical releases reported by industrial facilities. Total releases and carcinogen-specific releases by county.
Indicators
Total TRI releases, Carcinogen releases, Facility count
Data vintage
2023
Refresh
Annual
EPA UCMR5 / ECHO
Environmental Protection Agency
PFAS (per- and polyfluoroalkyl substances) detections in public water systems. A critical emerging contaminant indicator.
Indicators
PFAS detected, PFAS severity score
Data vintage
2023–2024
Refresh
Quarterly
NOAA Applied Climate Information System
National Oceanic and Atmospheric Administration
County-level extreme heat metrics computed from gridded daily temperature data. A leading climate-health indicator.
Indicators
Days above 95°F, Average summer max temperature
Data vintage
2024–2025
Refresh
Monthly
USGS Pesticide National Synthesis Project
U.S. Geological Survey
Estimated agricultural pesticide use by county. Covers all major active ingredients.
Indicators
Total pesticide use (kg/year)
Data vintage
2021
Refresh
Annual
EPA Radon Zones
Environmental Protection Agency
Predicted indoor radon levels by county. Zone 1 indicates the highest exposure risk. Still the canonical reference for radon assessment.
Indicators
Radon zone classification (1–3)
Data vintage
1993 (canonical, still current)
Refresh
Static
Health Outcomes
Chronic disease prevalence from the CDC. What the population is actually experiencing today.
CDC PLACES
Centers for Disease Control and Prevention
Model-based small-area estimates of chronic disease prevalence from the Behavioral Risk Factor Surveillance System. The primary source for county-level disease burden measurement in the US.
Indicators
Asthma, COPD, Cancer, CHD, Stroke, Kidney disease, Diabetes, Depression, Mental distress, Obesity, Smoking, Cholesterol, Blood pressure, Physical inactivity
Data vintage
2022–2023
Refresh
Monthly
Mortality & Cancer
Cause-specific mortality and cancer incidence. The lethal end-state of the conditions above, and the clearest validation benchmark for our scoring methodology.
CDC WONDER (D158)
Centers for Disease Control and Prevention
Underlying cause of death data. Crude mortality rates per 100,000 population by county and cause. CDC suppresses cells with fewer than 10 deaths.
Indicators
All-cause, Cancer, Heart disease, Stroke, CLRD, Overdose, Suicide, Diabetes, Lung cancer, Kidney, Unintentional
Data vintage
2018–2024
Refresh
Monthly
NCI State Cancer Profiles
National Cancer Institute
Age-adjusted cancer incidence rates by county and cancer site. Sourced from the US Cancer Statistics (USCS) program.
Indicators
All sites, Lung & bronchus, Colorectal, Female breast, Prostate
Data vintage
2018–2022
Refresh
Monthly
Healthcare Access
Provider supply and Medicare spending from CMS. Whether the system serving this population is equipped for the burden it faces.
CMS NPPES
Centers for Medicare & Medicaid Services
National Plan and Provider Enumeration System. Healthcare provider supply by specialty and county, used to compute the Provider Gap score with adjacency adjustment.
Indicators
Total specialists per 100K, Pulmonology, Cardiology, Oncology, Psychiatry per capita
Data vintage
Current month
Refresh
Monthly
CMS Geographic Variation PUF
Centers for Medicare & Medicaid Services
Medicare spending and utilization by county. Per-beneficiary spending across care settings.
Indicators
Inpatient, Outpatient, SNF, Home health, DME per beneficiary
Data vintage
2014–2023
Refresh
Monthly
Demographics & SDOH
Social determinants of health from the Census Bureau and County Health Rankings. The upstream conditions that shape both access and outcomes.
Census ACS 5-Year Estimates
U.S. Census Bureau
Demographic and socioeconomic data including race/ethnicity composition, income, insurance, housing age, and poverty rates. The backbone of the SDOH composite.
Indicators
Race/ethnicity (7 groups), Pre-1978 housing, Median income, Uninsured rate, Poverty rate, Vehicle access
Data vintage
2019–2023
Refresh
Quarterly
County Health Rankings
University of Wisconsin Population Health Institute
County-level measures of health factors and outcomes compiled from multiple federal sources. Provides food insecurity, housing, transportation, and behavioral health indicators that feed the SDOH composite.
Indicators
Food insecurity, Housing cost burden, Physical inactivity, Excessive drinking, Drug overdose, Mental health provider ratio, Infant mortality, Low birth weight
Data vintage
2019–2025
Refresh
Annual
See what this data reveals for your county.
Every data source on this page flows into a unified county profile. Pick any county and see how these dimensions converge.