Property data source APIs: coverage, freshness, and limits

Know your data sources.

Each source has a page with its publisher, update schedule, coverage, known limits, and request fields. Coverage tells you where a source is available, not which fields a property will return. You can get the same details as JSON at /api/knowledge/data-sources.

Last verified September 9, 2026. That is when this list was last rebuilt from the ParcelOps source registry, not when each publisher last refreshed its own data.

tag: permits

EPA Regulated Facilities No auth
US regulated facilities, permits, inspections, compliance, and enforcement history from EPA ECHO.
environment facilities compliance permits enforcement
6 methodsScheduled
Texas Comptroller Business Records No auth
Search active Texas franchise taxpayers and sales-tax permit holders.
texas business-standing franchise-tax sales-tax permits
4 methodsScheduled
US Municipal Open Data Discovery No auth
Find local property datasets or search normalized permit, inspection, and violation events in five US markets.
open-data socrata municipal zoning permits
8 methodsScheduled