What are the grease trap requirements in Modesto, CA?

Food service establishments in Modesto 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 Modesto?

Yes, a FOG permit is required in Modesto.

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

Grease trap sizing depends on your establishment's flow rate, number of fixtures, and local code requirements. Use our free sizing calculator for a recommendation.

Grease Trap Requirements
Modesto, CA

FOG compliance regulations for food service establishments in Modesto, California.

quarterly

Pumping Freq.

Required

Permit

Yes

25% Rule

UPC

Code Base

Pumping Requirements

Frequency quarterly; or when grease/solids reach 25% of capacity

25% Rule Applies

Permits & Enforcement

Permit Required Required

Complete FOG Regulations

Pumping Frequency	quarterly; or when grease/solids reach 25% of capacity
25% Rule	Yes — trap must be pumped when grease and solids reach 25% of capacity
Permit Required	Yes
Record Keeping	Required — maintain pumping logs and manifests on-site
Plumbing Code	Uniform Plumbing Code (UPC)
Ordinance Ref.	Section 114149.1; Section 212; Section 114149.1; Chapter; Section 5-6.1006

Additional Notes

Best Management Practices (BMP) program referenced

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