MapGrid
In-depth reviewNational mapping and GIS platform providing regulatory overlays, parcel data across 17 states and Washington DC, environmental risk scoring, and tax sale tracking. Designed for tax-lien investors, environmental consultants, developers, and planners. Features include ASTM radius reports, net buildable area calculations, overlay stacking for 30+ regulatory constraints including FEMA flood zones and EPA site data, and normalized zoning comparisons for California and Oregon.
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How to install MapGrid as a PWA
Screenshots
Why we recommend MapGrid
MapGrid consolidates fragmented public data into a unified national platform, saving professionals hours of manual research across multiple county and state GIS portals. The platform stands out for its derived analytics: environmental risk scoring from EPA and state databases, automatic ASTM E1527-21 radius reports that save consultants 4-8 hours per Phase I assessment, and net buildable area calculations that subtract wetlands, stream buffers, and other constraints automatically. The regulatory overlay stacker provides visibility into 30+ constraint layers simultaneously—FEMA flood zones, wetlands, environmental sites, stream buffers—something free viewers typically don't offer. Parcel data refreshes weekly from state GIS services, environmental sites monthly from EPA databases, with coverage spanning 17 states and DC. The tax sale calendar aggregates county listings into a searchable interface, eliminating the need to check individual county websites. For California and Oregon, normalized zoning data enables cross-jurisdiction comparisons.
Best use cases
Best for: Tax-lien investors screening county tax sales for environmental risks before bidding. LSRPs and environmental consultants generating ASTM radius reports and integrating KCSL data with historical aerials for Phase I assessments. Real estate developers using the overlay stacker and net buildable calculator to quickly assess site constraints and developable area. Urban planners comparing normalized zoning across California and Oregon jurisdictions while reviewing regulatory overlays and parcel attributes in one interface.
Honest limitations
MapGrid is a specialized professional tool, not a general-purpose mapping app. The free Explorer tier limits users to 10 parcel lookups per day with minimal features. Paid plans start at $39/month for individual use, scaling to $299/month for teams. Parcel coverage is limited to 17 states and DC—not nationwide. Data freshness depends on upstream GIS services and may fall behind target refresh cadences. Normalized zoning is only available for California and Oregon, not other states.
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