Know your data sources.

North Dakota DEQ environmental data. ND DEQ AGOL + FracTracker mirror; no auth. - searchSpills (~5.4K) ⭐ Bakken-era oil + brine spills (FracTracker mirror, 2014) - searchStormwaterPermits (~2.9K) ⭐ Bakken well-pad construction permits by operator - searchGroundwaterMonitoring (~278), searchImpairedStreams (~34.8K Cat 5 = 303d), getServiceInfo upstream quirks: ND DEQ does NOT publish spills/USTs/air permits/abandoned pits as Feature Services — methods reframed against actual surface + FracTracker spills. Stormwater has NO COUNTY column — filter silently dropped, use bbox/near. Brine + crude oil spill upstream is the same dataset (deduped by Incident_ID when spillType:'all').

North Dakota DMR (Bakken/Three Forks) oil & gas. AGOL mirror of NDIC public well data; no auth. - searchWells (~25.5K) ⭐ filter by county, operator, status (A/PA/DRY/Confidential), well_type, township/range/section - searchPermits ⭐ wells in LOC/DRL/PNC/EXP permit states - getWellByApi, searchHorizontalLegs (~15.8K Bakken laterals), searchProductionByField, searchSpills, getServiceInfo upstream quirks: native dmr.nd.gov fee-services 401, working data is on AGOL sbogan_worldmap mirror. county UPPERCASE, status enum opaque codes (A/PA/DRY/Confidential), api lossy on production layer (use api_no on wells), horizontal legs only have linekey (api_LATn). Spills come from the FracTracker mirror — 2014-era extract, no live updates.

North Dakota Department of Trust Lands. AGOL Feature Services from owner jstegmiller@nd.gov_NDDTL; no auth. - searchOilGasLeases (~33K mineral tracts; 8.9K active) ⭐ filter county, lessee, eligible (default Leased) - getExpiringLeases ⭐ acquisition signal — leases expiring within windowDays - searchSurfaceLeases (~4.9K grazing/ag), getLeaseDetail, getServiceInfo upstream quirks: NDDTL does NOT publish OG-leases as a separate layer; they live inside the unified TrustLandsMineralsVW (filter lease LIKE '%OG-%'). exp/effective stored as MM/DD/YYYY string with " " for null. Counties Title-Case (different from ND DMR's UPPERCASE). landtrustdash.nd.gov is offline — AGOL views are the working public surface.