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: facilities

EPA Envirofacts GHGRP No auth
Facility greenhouse-gas emissions, sectors, locations, rankings, and trends from EPA.
environmental greenhouse-gas facilities due-diligence epa
8 methodsFreshness not declared
EPA Regulated Facilities No auth
US regulated facilities, permits, inspections, compliance, and enforcement history from EPA ECHO.
environment facilities compliance permits enforcement
6 methodsScheduled
EPA TRI Facilities No auth
Direct, bounded lookup of facilities in EPA’s Toxics Release Inventory.
environmental tri facilities due-diligence epa
1 methodFreshness not declared