Grease Trap Requirements
Ontario, CA

FOG Compliance in Ontario, CA

Food service establishments in Ontario operate under a combination of federal EPA pretreatment standards, California state plumbing code, and city-level FOG ordinances. Together these rules determine how grease traps must be sized, how often they must be pumped, and what happens when a restaurant falls out of compliance.

Pumping frequency is the compliance rule restaurant owners interact with most often. In Ontario, the rule is: Per wastewater permit schedule. This aligns with the 90-day US median enforced by most major cities. The city follows the Uniform Plumbing Code (UPC) for trap sizing and installation. Under Section 1014, which applies a fixture drainage load formula with a retention time factor, grease interceptors installed in Ontario must meet minimum capacity thresholds based on the fixtures connected to them — 3-compartment sinks, dishwashers, pre-rinse stations, wok stoves, and floor drains on the cook line. The local minimum trap size is: Per California Plumbing Code (UPC-based); gravity grease interceptor required for high-FOG cooking equipment (fryers, grills, griddles, stoves, kettles).

Ontario requires a dedicated FOG permit for any food service establishment generating fats, oils, and grease. The annual permit fee is Per Ontario Municipal Utilities Company; contact Environmental Programs at 1425 S. Bon View Ave. The permit is separate from, and in addition to, the plumbing permit required at installation. Violations carry maximum penalties of Per city enforcement; contact Ontario Municipal Utilities Company . Fines typically escalate with repeat violations, and severe discharges that cause sanitary sewer overflows can trigger federal Clean Water Act penalties layered on top of local fines.

Ontario enforces the 25 percent rule: grease traps must be pumped before the combined FOG and settled solids reach 25 percent of the trap's total liquid depth. Inspectors measure the depth with a sludge judge or dipstick, typically at surprise visits. Exceeding the threshold at inspection triggers a notice of violation and mandatory emergency pump-out, regardless of the scheduled pumping cycle. Self-monitoring reports required per wastewater permit; city inspections periodic. Establishments must maintain pumping logs, hauler manifests, and inspection reports on-site — missing records is itself a violation in most enforcement actions. Enforcement authority rests with the Ontario Municipal Utilities Company / Environmental Programs, which handles permit issuance, inspections, and hauler licensing.

For a deeper explanation of the rules this city enforces, read our guides on how grease traps work and the 25/50 pumping rule.