Idaho Grease Trap Regulations
FOG Compliance Overview
Idaho 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 Idaho Department of Environmental Quality (DEQ).
With approximately 4,033 food service establishments statewide, Idaho 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 3 cities we cover, 1 require a dedicated FOG permit. 1 city enforces the 25% rule for grease trap pumping.
Need a grease trap in Idaho?
Our free calculator uses UPC code requirements to recommend the right size for your establishment.
Size My Grease TrapCity Regulations in Idaho
| City | Pumping Frequency | Permit | 25% Rule |
|---|---|---|---|
| Boise | See details | — | — |
| Meridian | When FOG and solids exceed 20% of unit volume; high-vol... | Required | — |
| Pocatello | weekly; or when grease/solids reach 25% of capacity | — | Yes |
Frequently Asked Questions
What plumbing code does Idaho follow for grease traps?
Idaho 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 Idaho?
Idaho has approximately 4,033 food service establishments according to Census Bureau County Business Patterns data. We currently cover detailed FOG regulations for 3 cities in the state.
Do I need a grease trap permit in Idaho?
Permit requirements vary by city. Of the 3 cities we cover in Idaho, 1 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 Idaho?
Grease trap sizing in Idaho 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.