What are the grease trap requirements in Ontario, CA?

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

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

Grease trap sizing depends on your establishment's flow rate, number of fixtures, and local code requirements. Per California Plumbing Code (UPC-based); gravity grease interceptor required for high-FOG cooking equipment (fryers, grills, griddles, stoves, kettles). Use our free sizing calculator for a recommendation.

Grease Trap Requirements
Ontario, CA

Q: Do I need a grease trap permit in Ontario?

Yes, a FOG permit is required in Ontario. Fee: Per Ontario Municipal Utilities Company; contact Environmental Programs at 1425 S. Bon View Ave.

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

Per wastewater permit schedule

Pumping Freq.

Required

Permit

Yes

25% Rule

UPC

Code Base

Pumping Requirements

Frequency Per wastewater permit schedule; pump when floatable grease exceeds 6 inches or settleable solids exceed 8 inches

25% Rule Applies

Permits & Enforcement

Permit Required Required

Permit Fee Per Ontario Municipal Utilities Company; contact Environmental Programs at 1425 S. Bon View Ave

Max Fine Per city enforcement; contact Ontario Municipal Utilities Company

Complete FOG Regulations

Minimum Trap Size	Per California Plumbing Code (UPC-based); gravity grease interceptor required for high-FOG cooking equipment (fryers, grills, griddles, stoves, kettles)
Pumping Frequency	Per wastewater permit schedule; pump when floatable grease exceeds 6 inches or settleable solids exceed 8 inches
25% Rule	Yes — trap must be pumped when grease and solids reach 25% of capacity
Permit Required	Yes
Permit Fee	Per Ontario Municipal Utilities Company; contact Environmental Programs at 1425 S. Bon View Ave
Maximum Fine	Per city enforcement; contact Ontario Municipal Utilities Company
Inspections	Self-monitoring reports required per wastewater permit; city inspections periodic
Record Keeping	Required — maintain pumping logs and manifests on-site
Plumbing Code	Uniform Plumbing Code (UPC)
Ordinance Ref.	City of Ontario FOG Control Program Manual; Ontario Municipal Code; California Plumbing Code
Authority	Ontario Municipal Utilities Company / Environmental Programs

Additional Notes

Self-monitoring reports must include pumping manifests and maintenance record forms signed by responsible individual. Records must be retained for at least 4 years. All facilities must use licensed grease haulers permitted for pumping services.

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