UST Check → counties → Washington → Okanogan
Underground storage tanks & leak sites in Okanogan County, WA
Every figure below is from EPA UST Finder — the EPA-compiled national registry of state-reported underground storage tanks — county aggregates as published by EPA.
193registered tank facilities
92open tanks
417closed tanks
20leak incidents on record
10cleanups still open
10 leak cleanups in
Okanogan County are still open — the state has not closed the case.
An open cleanup near a property you're buying or lending on is a findable, checkable fact: it appears in a
per-address screen with distance and the registry record.
Largest registered facilities
By open-tank count, from the facility-level registry. Every fact is attributed to the EPA record (linked ID); something wrong — use the correction path in the footer and we'll fix or remove it promptly.
| Facility | City | Open / closed tanks | Status | EPA record |
|---|---|---|---|---|
| QUIK MART | Oroville | 4 / 5 | Open UST(s) | WA423 |
| PATEROS TRADING | Pateros | 4 / 3 | Open UST(s) | WA25962988 |
| OKANOGAN CHEVRON | Okanogan | 4 / 0 | Open UST(s) | WA68393969 |
| OMACHE TEXACO FOOD MART | Omak | 4 / 0 | Open UST(s) | WA47812852 |
| K&M FUEL, LLC | Oroville | 4 / 0 | Open UST(s) | WA31364435 |
| SUPER DUPER FOODS | Oroville | 4 / 0 | Open UST(s) | WA54143176 |
| QUIK-E-MART #2 | Brewster | 3 / 5 | Open UST(s) | WA51159227 |
| MAZAMA COUNTRY STORE | Mazama | 3 / 4 | Open UST(s) | WA9583422 |
Open leak cleanups — most recently reported
| Site | City | Reported | Substance | EPA record |
|---|---|---|---|---|
| Omak Gull 611 | OMAK | not reported | Benzene | WA5684 |
| Bobs Triangle Texaco | BREWSTER | not reported | Petroleum-Other | WA6185 |
| DALES TEXACO OROVILLE | OROVILLE | not reported | Petroleum Products-Unspecified | WA6258 |
| Chevron Omak | OMAK | not reported | Benzene | WA6263 |
| Conconully General Store | CONCONULLY | not reported | Non-Halogenated Solvents | WA6272 |
| Choice Automotive | OMAK | not reported | Petroleum-Diesel | WA12422 |
What this means if you're buying or lending here
- "Closed" ≠ clean. A closed tank was taken out of service per the registry — many were closed without soil testing, especially before the late 1990s.
- The registry is incomplete by design. Tanks removed before 1986 and most residential heating-oil tanks were never registered. A county with 193 registered facilities has an unknown number of unregistered ones.
- Open cleanups are the headline. 10 cases in this county are still open; contamination may still be under investigation or remediation — distance from a specific parcel is what matters, and that's a per-address question.
Screen a specific property
This page covers the county. A purchase or loan decision needs the registry around one address: registered tanks at the parcel, every facility within 500 and 1,500 ft, leak cleanups with status and distance — each line cited to the official record.
Screen an address — $49 How it worksThis is a screen of EPA-registered tank and leak records, not an environmental site assessment. State registries are incomplete by design: tanks removed before 1986 and most residential heating-oil tanks were never registered, so a clean screen cannot prove the absence of a tank. "Closed" means a tank was taken out of service per the registry — it does not certify that no contamination remains.
source: EPA UST Finder EPA data vintage 2024-12-04 computed 2026-06-12