Know your data sources.

Texas Commission on Environmental Quality contamination, water, and air datasets. Public ArcGIS REST MapServer, no auth. Layers: - lpst (~30k Leaking Petroleum Storage Tanks) - pst (~19k active Petroleum Storage Tanks) - superfund (~170 state Superfund sites) - vcp (~3k Voluntary Cleanup), brownfield (~210), ihwca (~5.7k Industrial Hazardous Waste) - pws (~19k Public Water System wells), ww_outfall (~4.6k wastewater outfalls) - aqs (~230 air-quality monitoring sites) Counties stored UPPERCASE upstream; returned Title Case. PWS and AQS layers have no county field — pass bbox or near. getGroundwaterOverlay combines Edwards Aquifer + PGMA + GCDs in one call.

Texas active franchise-taxpayer and sales-tax permit records from data.texas.gov. Search by legal name or exact taxpayer/SOS identifiers, preserve raw standing codes, and distinguish not-found from inactive or nonexistent.

Texas Water Development Board groundwater data. Public ArcGIS REST FeatureServer, no auth. Layers: - sdr (~680k Submitted Driller's Reports — primary) - gwdb (~143k curated Groundwater Database sites with aquifers + water levels) - plugging (~242k Plugging Reports) - bracs (~89k brackish wells with geophysical logs) Owner names redacted by default; pass includeOwner: true only when explicitly requested. Counties returned in Title Case. Use bbox or near for spatial filters.

Texas General Land Office state lands. No auth. O&G: searchActiveLeases (~7.3K) ⭐ royalties+primary-term dates, getExpiringLeases ⭐ acquisition feed, searchInactiveLeases (~12K), getLeaseDetail, searchLeaseUnits, searchPSFLands (~21.9K), searchEasements, searchOffshoreStructures, getNominatedTracts. Coastal/land: searchUplandLeases, searchSubmergedTracts (~11K), searchBeachAccess, searchCoastalLeases (~9.2K), searchStateAgencyLands, searchNavigationDistricts, searchPriorityHabitatAreas, searchEsiShoreline (~48K lines), searchInSituBurnExclusion + boundary getters (Coastal Zone, 3-league/3-mile lines, Dispersant Zone, lease polygons). getServiceInfo for schemas. Quirks: MM/DD/YYYY string dates; most non-lease layers have no COUNTY column; ESI/boundary layers return line geometry.

TxGIO — Texas Geographic Information Office (formerly TNRIS), the state GIS clearinghouse, through public ArcGIS REST services. Runs on PatchOps' shared ArcGIS engine and returns WGS84 GeoJSON for incorporated cities, legislative districts, 1:250k geology, NHD hydrography, and StratMap parcel polygons. The parcel MapServer is exposed through bounded service-level identify queries with typed filters and truncation disclosure. Complements rrc, tceq, twdb, and tx-glo. No auth.