Three approved state programs and Alaska — the last EPA-direct frontier, where the federal government runs the UST program across plane-only villages. 18,946 active tanks, 38 tribal nations with tanks out of ~271 recognized, and the only state agency in America that writes insurance for tanks. In an emergency always call 911 and the National Response Center 1-800-424-8802.
EPA UST Finder composite · synced 2026-10-21
WashingtonApproved — §282.97
Dept of Ecology (SPA §282.97, 1993/2021) + PLIA — the insurance unicorn
Fund: PLIA: the state writes coverage; loan window Oct 1–Mar 1
OregonApproved — §282.87
DEQ (SPA §282.87, 2011/2019)
Fund: DEQ financial assistance (verify current mechanism)
IdahoApproved — §282.62
DEQ (SPA §282.62, 2012/2020)
Fund: Petroleum Storage Tank Fund
AlaskaNO SPA — EPA-direct
EPA Region 10 implements federal UST; ADEC (18 AAC 78) runs state law in parallel
Fund: No state UST fund (private FR)
The PLIA unicorn — Washington
Washington's Pollution Liability Insurance Agency is the only state agency in the nation that writes coverage for tank owners. Born 1989 as a reinsurer of private policies; since 2023 it provides financial assurance directly; in 2026 its heating-oil insurance program became a loan-and-grant program. Its petroleum tax (0.3% at first introduction) self-switches off when the fund reaches $30M and back on below $15M. The UST loan window runs Oct 1 – Mar 1.
Indian Country — 38 nations of ~271, the cleanest belt
The biggest tribe-count region (271 federally recognized, mostly Alaska Native entities) holds the lowest with-tanks ratio in the country: 38 nations, 598 facilities, 1,614 tanks — 79% already closed — and only 6 open cleanups of 206. The Yakama Nation (373 tanks) is the third-largest tribal program in America. In all of Alaska, exactly one entity appears in EPA's data: the Metlakatla community, whose 15 tanks are all permanently closed — village bulk-fuel farms sit outside the federal registry.
Yakama Nation (WA) — 137 facilities · 373 tanks — #3 in America behind Navajo and CSKT
Nez Perce Tribe (ID) — 326 tanks — every one of its 37 cleanups closed
Colville · Fort Hall · Coeur d'Alene — 141 · 138 · 114 tanks
Metlakatla (AK) — 15 tanks, all closed — the only Alaska entry
Per-tribe table from EPA's May-2026 tribal data files, parsed per-tank.
The frontier + the map closes
Alaska: 874 active tanks, the region's toughest compliance (48%), and nine federal inspections in six months — a 6%-of-cycle pace across plane-only country. Washington carries the region's heaviest cleanup backlog (2,506 open). And with this region, the map closes: all ten EPA regions now carry their implementing authority, their tribal registry, their benchmarks, and their lanes — every number sourced, every premise checked.
Sources: eCFR 40 CFR Part 282 codified text (issue 2026-10-20) · EPA R10 tribal UST/LUST data (May 2026, parsed per-tank) · EPA mid-FY2026 performance measures (canon, subtotal-verified; the FY2025-EOY file is quarantined) · EPA UST Regional Contacts (Oct 19, 2026) · plia.wa.gov (Oct 2026). Wershifany records and routes — it never replaces the official agency.