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Data Sources

PropertySiteCheck pulls from 17 public environmental databases to produce each risk score. All sources are free, government-maintained, and updated on the schedule below.

SignalSourceWeightUpdatedCoverage
MiEJScreen Overall ScoreMDEGLE / EPA EJScreen0.1550×AnnualAll Michigan census tracts
LUST Site DensityEGLE Michigan LUST Registry0.1200×MonthlyAll Michigan census tracts
UST Non-Leaking DensityEGLE UST Registry (Prog. 211)0.0600×MonthlyAll Michigan census tracts
RCRA Hazardous Waste FacilitiesEPA ECHO / RCRAInfo0.0900×QuarterlyAll Michigan census tracts
Brownfield SitesEGLE Brownfield Registry0.0600×QuarterlyAll Michigan census tracts
Part 201 Contamination SitesEGLE Part 2010.0700×QuarterlyAll Michigan census tracts
Flood Risk ScoreFEMA National Risk Index0.0300×AnnualAll Michigan census tracts
Superfund ProximityEPA NPL Sites0.0300×QuarterlyAll Michigan census tracts
TRI Toxic Release FacilitiesEPA Toxics Release Inventory0.0300×AnnualAll Michigan census tracts
Radon ZoneEPA Radon Zone Map0.0150×StaticAll Michigan counties
Wetland ProximityUSFWS NWI / SEMCOG0.0150×AnnualSoutheast Michigan (SEMCOG region)
FEMA Floodplain (FIRM)FEMA National Flood Hazard Layer0.0150×AnnualAll Michigan census tracts
Terrain RuggednessUSDA Area & Road Ruggedness Scales0.0150×StaticAll Michigan census tracts
Solid Waste LandfillsEGLE Part 1150.0150×QuarterlyAll Michigan census tracts
NRC Spill ReportsUSCG National Response Center0.1200×MonthlyAll Michigan census tracts
Impaired Waters (303d)EPA ATTAINS0.0800×AnnualAll Michigan census tracts
RMP Facility ProximityEPA FRS RMP0.0800×MonthlyAll Michigan census tracts

Proximity method

Count-based signals (LUST, UST, RCRA, TRI, Part 201, Landfills, Brownfields, Superfund) use a 0.5-mile haversine radius from the census tract centroid. Log-scaling is applied to density signals to prevent outliers from dominating the score.

Missing data

A small number of tracts (~9%) are not present in the MiEJScreen dataset. For those tracts, the EJ score is excluded and remaining signal weights are redistributed proportionally. The report will show partial confidence.

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