Methodology

How we calculate your score

PropertySiteCheck aggregates data from 17 federal, state, and regional environmental databases into a single composite risk score for any Michigan census tract. Here's exactly how it works.

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View a complete sample report with score, category breakdown, and flagged environmental concerns.

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Composite Score Formula

The composite score is an additive weighted sum, capped at 100:

final_score = min(100, round(
  MiEJScore_percentile × 0.10
  + LUST_density × 0.12
  + nrc_spill_density × 0.12
  + RCRA_score × 0.09
  + rmp_facilities × 0.09
  + attains_impaired_waters × 0.08
  + part201_score × 0.07
  + UST_density × 0.07
  + brownfield_indicator × 0.06
  + flood_risk_score × 0.03
  + superfund_indicator × 0.03
  + TRI_score × 0.03
  + landfill_score × 0.015
  + radon_zone × 0.015
  + wetland_indicator × 0.015
  + firm_floodplain × 0.015
  + terrain_ruggedness × 0.015
))

LUST and UST densities use log-scaling. All signals are normalized to a 0–100 range before weighting.

View interactive weight‑contribution chart.

Risk Tiers

Low Risk(0–29.9)

Typical Michigan baseline risk; no material elevated signals requiring immediate escalation.

Moderate Risk(30–44.9)

One or more meaningful concerns; enhanced due diligence recommended.

High Risk(45–59.9)

Multiple elevated concerns; Phase I ESA strongly recommended.

Very High Risk(≥ 60)

Severe environmental risk profile; professional assessment required before transaction.

Data Sources & Weights

Signal	Source	Weight	Updated
MiEJScreen Overall Score	MDEGLE / EPA EJScreen	0.10×	Annual
LUST Site Density	EGLE Michigan LUST Registry	0.12×	Monthly
NRC Spill Reports	USCG National Response Center	0.12×	Monthly
RCRA Hazardous Waste Facilities	EPA ECHO RCRA Database	0.09×	Quarterly
RMP Facility Proximity	EPA FRS RMP	0.09×	Monthly
Impaired Waters (303d)	EPA ATTAINS	0.08×	Annual
Part 201 Contamination Sites	EGLE Part 201	0.07×	Quarterly
UST Non-Leaking Density	EGLE UST Registry (Prog. 211)	0.07×	Monthly
Brownfield Sites	EGLE Brownfield Registry	0.06×	Quarterly
Flood Risk Score	FEMA National Risk Index	0.03×	Annual
Superfund Proximity	EPA NPL Sites	0.03×	Quarterly
TRI Toxic Release Sites	EPA Toxic Release Inventory	0.03×	Annual
Solid Waste Landfills	EGLE Part 115	0.015×	Quarterly
Radon Zone	EPA Radon Zone Map (county-level)	0.015×	Static
Wetland Proximity	USFWS NWI / SEMCOG	0.015×	Annual
FEMA Floodplain (FIRM)	FEMA NFHL Layer 28	0.015×	Annual
Terrain Ruggedness	USDA Area & Road Ruggedness Scales	0.015×	Static

Limitations & Disclaimer

PropertySiteCheck is a screening tool, not a Phase I Environmental Site Assessment. Scores reflect census-tract-level data, not parcel-level conditions. A low score does not guarantee a property is free of environmental concerns — it means the available data signals are not elevated for that tract. Always consult a qualified environmental professional before making a purchase or lending decision.

Wetland proximity data is currently limited to the SEMCOG region (Southeast Michigan). Statewide wetland coverage is planned for v2.

Version History

Version	Date	Notes
v1.1	Feb 26, 2026	Weight recalibration — composite scoring weights adjusted for better site-specific signal emphasis
v1.0	Feb 2026	Initial release — 10 environmental signals, Michigan coverage

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Questions? contact@enviroscreen.com