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Data Disclaimer

Data Sources

MapGrid aggregates publicly available geographic data from government agencies and services across all 50 states, including:

  • State GIS services — Parcel boundaries, assessment data, cadastral data (e.g., NJGIN, state parcel databases)
  • State environmental agencies — Contaminated sites, wetlands, underground storage tanks, environmental remediation sites (e.g., NJDEP, state DEP/DEQ databases)
  • U.S. Environmental Protection Agency (EPA) — Superfund (NPL), Brownfields, RCRA, Toxics Release Inventory (TRI)
  • Federal Emergency Management Agency (FEMA) — National Flood Hazard Layer (NFHL)
  • U.S. Fish & Wildlife Service — National Wetlands Inventory (NWI)
  • U.S. Census Bureau — American Community Survey (ACS) demographics
  • County and municipal GIS portals — Zoning, local overlays

Accuracy and Completeness

This data is provided "as is" without warranty of any kind. MapGrid:

  • Is not authorized by, endorsed by, or affiliated with any government agency
  • Does not guarantee the accuracy, completeness, or timeliness of any data
  • May display data that is outdated due to refresh schedules (see data freshness indicators on each layer)
  • May contain errors introduced during ingestion or processing
  • Should not be used as the sole basis for any legal, financial, or environmental decision

Not a Substitute For

  • Phase I or Phase II Environmental Site Assessment (ASTM E1527-21)
  • Title search or title insurance
  • Professional land survey or ALTA/NSPS survey
  • Flood determination or elevation certificate
  • Legal opinion on environmental liability, zoning compliance, or land use
  • Appraisal or property valuation
  • Insurance underwriting

Environmental Risk Scores

Environmental risk scores displayed on MapGrid are derived estimates based on proximity analysis of public records. They are not professional environmental assessments. A low score does not mean a property is free of contamination. A high score does not confirm contamination. Always engage a qualified environmental professional for site-specific assessment.

Privacy Law Compliance

MapGrid does not display, store, or redistribute property owner names that have been redacted from state-hosted geospatial data. Where applicable (e.g., NJ Daniel's Law, P.L. 2020 c.125), owner information, if displayed, is sourced from publicly recorded deed instruments.

State Agency Data Notice

This product uses data from various state and federal agencies. The data is provided for informational purposes only and is not endorsed or certified by any government agency. Users should consult the relevant agency directly for official determinations.

Federal Data

Federal data (FEMA, Census, USDA, EPA, USGS) is in the public domain per 17 U.S.C. §105 and is redistributed with attribution.