Know your data sources.

Alabama Department of Environmental Management permits + UST + brownfields + Justice40 + complaints via gis.adem.alabama.gov. 5 curated layers from ADEM's 110+ MapServer catalog. - searchPermits ⭐ 83.7K AEPACS records across 42 categories (NPDES, MS4, air, UIC, scrap tire, CAFO, ...) - searchUSTSites ⭐ 10.3K UST facilities (FIPS or name) - searchBrownfields ⭐ 776 ADEM brownfield events - searchComplaints ⭐ 13K public complaints (AIR/COASTAL/LAND/WATER) - searchJustice40Tracts (655) §0: AEPACS uses ESRI_OID + duplicate object_id. UST has FIPS-only county. Brownfields County has DeKalb/De Kalb. CRS 26916; outSR=4326.

California EPA — DTSC Envirostor cleanup database + OEHHA CalEnviroScreen + DTSC HWTS. - searchEnvirostorSites ⭐ ~13.7K cleanup sites. 13 site_types. county UPPERCASE - searchCalEnviroScreen ⭐ ~8K census tracts. PiP via {lat, lon}. Filter minCIscoreP/minCIdecile - searchHazardousWasteFacilities ~107K HWTS RCRA handlers (G/T/TSDF). NO county - searchBrownfields = Envirostor scoped to Voluntary Cleanup + Calmortgage + School Cleanup - getServiceInfo upstream quirks: Authoritative owners only — DTSC_Admin (Envirostor + HWTS) on services3.arcgis.com/Oy2JTCD10wkoelxS, Kelsey.Ranjbar_OEHHA (CalEnviroScreen 4.0) on services1.arcgis.com/PCHfdHz4GlDNAhBb. No standalone Brownfields Feature Service exists; modeled via Envirostor site_type filter.

Mississippi Department of Environmental Quality MUSTER (UST + CERCLA) and 2024 Impaired Waters via opcgis.deq.state.ms.us. 5 curated layers covering petroleum tank sites, brownfield/CERCLA sites, 303(d) impaired waters, and completed TMDLs. - searchUSTSites ⭐ 11.9K active+inactive UST facilities - searchCERCLASites ⭐ 2.28K state CERCLA / brownfields with NPL flags - searchImpairedWaters ⭐ 233 streams + 4 polygons on the 2024 303(d) list - searchTmdlCompleted, getServiceInfo §0 caught: MUSTER does NOT support offset paging — handler iterates by OBJECTID. 5 scale-tier duplicate UST layers — only layer 10 exposed. BASIN column mixes UPPER and Title Case. POLLUTANT has numeric-prefix duplicates. Host has been historically flaky — handler retries once on 5xx/HTML.

Ohio EPA. Spills + brownfields + NPDES + district lookup. - searchSpillsAndReleases (~16K, since May 2017) ⭐ filter county/product/district/year - searchBrownfields (~217 DERR TBA grants) ⭐ no county column — bbox/near only - searchNPDESPermits (~3.1K active individual permits) - getEPADistrict (point-in-polygon for OEPA's 5 districts) - getServiceInfo upstream quirks: Spills county + reportedproduct heavily space-padded; oepadist has 'NULL'/'CDO ' variants. NPDES permit_status only ever ACTIVE. All 3 native MapServers use lowercase `objectid` as OID. Brownfields layer has NO county column.

Oklahoma DEQ wellhead protection + remediation + monitoring. Native ArcGIS REST MapServers, no auth. - searchWellheadProtectionAreas ⭐ — drilling-restriction polygons (~5.9K) around PWS - searchRemediationSites ⭐ — Institutional Controls (~890) under formal cleanup programs - searchVoluntaryCleanupSites, searchAccreditedLabs (~151), searchAirQualitySites (28) - getServiceInfo quirks: WHPA has NO name / county / facility id — only ZONE (A/B/C) + SOURCE_IND. Filter zone or bbox. Remediation County values dirty (Garfeld vs Garfield, "Tulsa" vs "Tulsa County") — handler LIKE-matches + Title-Case strips trailing " County". LabAccred Lab_Type has typos. Base_Certification_Status always 'Accredited'. Air POLLUTANTS comma-joined; LIKE-matched.

Utah DEQ — Voluntary Cleanup Program, Brownfields, CERCLIS hazardous-waste sites. - searchVoluntaryCleanup ⭐ ~142 VCP sites (mostly Salt Lake County) - searchBrownfields ~29 sites (Targeted 18 + Other 11 combined) - searchHazardousWasteSites ~145 active CERCLIS sites (~469 incl. archived) - getServiceInfo upstream quirks: AGOL services1.arcgis.com/99lidPhWCzftIe9K owned by UtahAGRC. All 4 layers use SITECNTY (NOT COUNTY) UPPERCASE. Date columns are MM/DD/YYYY strings (NOT epoch). VCP STATE = 'UT' only and POSTTONET = 'Yes' only — degenerate. SITEREM has ARCHIVED Err/No/Yes; default activeOnly filters to "No" (~145 vs raw 469). No UT-published RCRA hazardous-waste-handler service exists — for RCRA G/T/TSDF use EPA Envirofacts (already exposed).

Wyoming WDEQ — voluntary remediation + mining permits + solid waste + AML. - searchVoluntaryRemediation (~287 VRP/ICP/Brownfields) ⭐ - searchMinePermits (~265 LQD active) ⭐ - searchSolidWaste (~312 landfills/dumps), searchAMLPads (~284), getServiceInfo Spec drift: searchAirPermits + searchUSTSites + searchSpills DROPPED — no public Feature Services. WDEQ native servers (gis.deq.wyoming.gov, 020-arcgis02.wyores.local) are internal-only. Replacements: searchSolidWaste + searchMinePermits + searchAMLPads (drawn from WDEQ AGOL mirrors). upstream quirks: VRP INDUSTRY field has free-text variants (Energy/Energy-T&S/Energy-E&P/Refinery/Military/Commercial). Mine permits COUNTY is UPPERCASE. Solid Waste COUNTY is Title Case. Date columns are mix of strings and epoch-ms.