MapGrid
FreeWeb app · runs in your browser, nothing to download
Finance & BusinessNational interactive mapping platform combining parcel data across 17 states and Washington, DC with 30+ regulatory overlays including FEMA flood zones, wetlands, EPA environmental sites, and stream buffers. Features environmental risk scoring, tax sale calendar aggregation, ASTM radius reports, net buildable area calculations, and normalized zoning data for California and Oregon. Built for tax-lien investors, environmental consultants, developers, and planners.
Bonus: install MapGrid from your browser
Screenshots
Why we recommend MapGrid
MapGrid unifies fragmented public data into a single interactive platform that would otherwise require visiting dozens of county and state GIS portals. The Regulatory Overlay Stacker lets you toggle between 30+ constraint layers simultaneously, immediately revealing flood zones, wetlands, EPA Superfund sites, RCRA facilities, and state cleanup registers. Environmental risk scoring automates what consultants typically do manually, scanning EPA and state databases to generate 0–100 scores per parcel. ASTM Radius Reports auto-generate at E1527-21 standard distances, reportedly saving 4–8 hours per Phase I assessment. The Net Buildable Calculator subtracts unbuildable areas—wetlands, buffers, easements—to show developable acreage instantly. Tax sale listings from multiple counties aggregate into a filterable calendar. Parcel data refreshes weekly from state GIS services, environmental sites monthly, covering 17 states and growing. Normalized zoning comparisons across California and Oregon jurisdictions add context unavailable in most municipal viewers.
Best use cases
Best for: Tax-lien investors screening county auctions who need rapid environmental due diligence before bidding. Licensed Site Remediation Professionals (LSRPs) and environmental consultants preparing Phase I ESAs who can eliminate hours of manual radius searches. Real estate developers evaluating multi-parcel assemblages who need to see every zoning restriction, setback, and environmental constraint overlaid at once. Urban and regional planners comparing regulatory frameworks across jurisdictions, particularly in California and Oregon where normalized zoning data is available. Any professional needing to cross-reference parcel boundaries with federal and state environmental databases without juggling multiple browser tabs.
Honest limitations
Geographic coverage is limited to 17 states plus Washington, DC for parcel data; nationwide regulatory overlays are broader but state-specific programs (wetlands, cleanup registers) only appear where states publish them. The free Explorer tier caps lookups at 10 parcels per day with minimal export capabilities. Paid plans start at $39/month for Solo (100 lookups/day) and scale to $299/month for Team access. Data refresh cadences are targets, not guarantees—upstream GIS changes can delay updates. Not a substitute for professional environmental assessments or legal due diligence; it's a research and screening tool.
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