What are the grease trap requirements in Great Falls, MT?

Food service establishments in Great Falls must install and maintain grease traps or interceptors per local FOG ordinances. The city follows the Uniform Plumbing Code (UPC).

Do I need a grease trap permit in Great Falls?

Yes, a FOG permit is required in Great Falls.

What size grease trap do I need for my restaurant in Great Falls?

Grease trap sizing depends on your establishment's flow rate, number of fixtures, and local code requirements. Grease interceptors: minimum ~600 gallons (can exceed 2,000 gallons). Use our free sizing calculator for a recommendation.

Grease Trap Requirements
Great Falls, MT

FOG compliance regulations for food service establishments in Great Falls, Montana.

Check locally

Pumping Freq.

Required

Permit

Check locally

25% Rule

UPC

Code Base

Pumping Requirements

Frequency Contact local authority

25% Rule Check locally

Permits & Enforcement

Permit Required Required

Complete FOG Regulations

Minimum Trap Size	Grease interceptors: minimum ~600 gallons (can exceed 2,000 gallons)
Pumping Frequency	Contact local authority for requirements
25% Rule	Check with local authority
Permit Required	Yes
Record Keeping	Required — maintain pumping logs and manifests on-site
Plumbing Code	Uniform Plumbing Code (UPC)
Ordinance Ref.	Official Code of City of Great Falls; FOG Program Manual and Management Policy
Authority	City of Great Falls Public Works / Environmental Division

Additional Notes

Two types of grease devices recognized: hydro-mechanical grease trap (small, inside, under sink) and grease interceptor (vault, minimum ~600 gallons, buried outside). City manages FOG and Trucked and Hauled Waste Sector Control Programs in accordance with federal requirements.

Regulations change frequently. Always verify current requirements with your local wastewater authority or plumbing inspector before making compliance decisions. Last updated: March 2026.