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Unlike most maintenance requirements that are set to a fixed calendar interval, LA County's grease trap requirement is performance-based: the trap must be cleaned before the combined layer of floating grease and settled solids reaches 25% of the tank's total liquid depth. At that point, the trap stops separating effectively and begins passing FOG directly into the municipal sewer. Inspectors measure the actual accumulation level, not the date of the last service. In practice, the 25% threshold translates to a service interval of 30 to 90 days for most restaurants, with high-volume frying and heavy-grease operations needing bi-weekly service. Conservative operators clean at 20% or less to maintain a compliance buffer. If your trap is reaching 25% faster than your current service schedule can prevent, the frequency needs to increase — the threshold, not the schedule, is the legal standard.

The 25% Rule is the operational standard that governs grease trap compliance throughout Los Angeles County. A functioning grease trap works by providing a retention zone where grease floats to the top and solids settle to the bottom, allowing relatively clean water to exit to the sewer in between. When the combined depth of the floating grease layer and the settled solids layer reaches 25% of the trap's total liquid depth, there is no longer adequate separation space — the trap passes FOG directly into the municipal sewer system. This is the condition inspectors measure, and exceeding it is a violation regardless of when the trap was last serviced. Grease blockages in LA County cause approximately 47% of all sewer overflows — the 25% Rule is enforced aggressively as a result. Cleaning schedules should target service at 15 to 20% accumulation to maintain a compliance buffer against unexpected volume spikes.

Grease trap violations in Los Angeles carry two categories of financial exposure. The first is documentation failure: restaurants that cannot produce current service manifests during inspection face fines of $250 to $1,000 per day until records are provided. The second — and more serious — is operational non-compliance: operating without a required grease trap, or with one that is consistently over the 25% threshold, can result in fines of $500 to $25,000 per violation, immediate closure orders, and personal liability for the cost of any municipal sewer damage caused by FOG discharge from your facility. First-time violations in LA typically start at $1,000 with daily penalties escalating for continued non-compliance. Beyond the direct fines, a sewer overflow attributable to your facility creates environmental liability that can significantly exceed the cost of the original violation. Consistent professional service and complete manifest records are the only reliable protection.

Enzyme and bacterial additives are frequently marketed to restaurant operators as a way to extend grease trap service intervals or eliminate pumping altogether. This claim is false, and acting on it creates compliance risk. LA County's FOG program explicitly prohibits reducing cleaning frequency based on additive use. Additives can break down small amounts of FOG and support trap function between professional services, but they cannot address the solids that accumulate at the bottom of the trap or the grease that accumulates at the top at the volumes a commercial kitchen produces. At most, additives shift a service interval by days, not weeks. The only compliant way to manage grease trap accumulation is physical pumping by a licensed hauler, with a manifest produced for each service. Operators who rely on additives to reduce service frequency and are then found in violation have no regulatory defense.

Grease trap service documentation is a legal requirement, not a courtesy. Each pump-out must be accompanied by a service manifest produced by the licensed hauler that documents the date and time of service, the condition of the trap including the measured accumulation level, any findings or deficiencies observed, and the hauler's license information. These manifests must be retained on-site and produced immediately during a health inspection — an inspector who asks for records and finds gaps will cite both the documentation failure and investigate whether the underlying service actually occurred. LA County's environmental compliance systems increasingly use digital tracking to flag food service establishments that are overdue for grease trap service, sometimes triggering automatic inspection visits before a complaint is filed. Maintaining a complete, current manifest file is the only protection against those visits resulting in citations.