Washington Grease Trap Regulations
FOG Compliance Overview
Washington follows the Uniform Plumbing Code (UPC) as its base plumbing code. The UPC requires grease interceptors for commercial kitchens and uses fixture unit calculations for sizing requirements. The state's regulatory authority is the Washington Department of Ecology.
With approximately 17,386 food service establishments statewide, Washington has significant FOG compliance needs. Individual cities and municipalities may adopt additional local ordinances that go beyond the state plumbing code, including stricter pumping schedules, permit requirements, and enforcement penalties. Of the 10 cities we cover, 6 require a dedicated FOG permit. 7 cities enforce the 25% rule for grease trap pumping.
Need a grease trap in Washington?
Our free calculator uses UPC code requirements to recommend the right size for your establishment.
Size My Grease TrapCity Regulations in Washington
| City | Pumping Frequency | Permit | 25% Rule |
|---|---|---|---|
| Auburn | Every 90 days (grease traps); Quarterly (grease interce... | Required | Yes |
| Bainbridge Island | annual | — | — |
| Bellevue | See details | Required | Yes |
| Everett | weekly | — | — |
| Port Angeles | Every 90 days (quarterly); or when grease/solids reach ... | Required | Yes |
| Puyallup | When FOG/solids reach 25% of overall liquid depth; may ... | Required | Yes |
| Seattle | At minimum every 90 days for the first year; frequency ... | Required | Yes |
| Spokane | See details | — | — |
| Tacoma | Must be pumped when grease and solids reach 25% of inte... | — | Yes |
| Vancouver | As needed to prevent FOG discharge violations; maintena... | Required | Yes |
Frequently Asked Questions
What plumbing code does Washington follow for grease traps?
Washington follows the Uniform Plumbing Code (UPC). The UPC requires grease interceptors for commercial kitchens and uses fixture unit calculations for sizing. Individual cities may adopt stricter local ordinances.
How many food service establishments are in Washington?
Washington has approximately 17,386 food service establishments according to Census Bureau County Business Patterns data. We currently cover detailed FOG regulations for 10 cities in the state.
Do I need a grease trap permit in Washington?
Permit requirements vary by city. Of the 10 cities we cover in Washington, 6 require a dedicated FOG permit. Check your specific city's requirements below or contact your local wastewater authority.
What size grease trap do I need in Washington?
Grease trap sizing in Washington depends on your establishment's flow rate, number of fixtures, and local code requirements under the UPC. Use our free sizing calculator for a recommendation tailored to your setup.
Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.