California FOG Compliance Guide for Restaurants & Food Businesses

If you run a restaurant or commercial food operation in California, FOG compliance is not something you can afford to approach casually. California operates one of the most layered, actively enforced regulatory environments for fats, oils, and grease in the country — with oversight coming from multiple state agencies, regional water boards, and highly specific local programs that vary significantly from city to city. What passes in one county may not come close to the standard in the next. This guide breaks down exactly how the regulatory structure works, what the specific requirements look like in Los Angeles, San Diego, and Orange County, and what your operation needs to do to stay on the right side of all of it.

What Is FOG and Why Does California Take It Seriously?

FOG stands for fats, oils, and grease — the byproducts generated in any commercial kitchen. It comes from cooking oils, meat fats, butter, sauces, dairy products, and food scraps. In small amounts, it may seem harmless. In the volumes that restaurants produce daily, it becomes a serious infrastructure and environmental problem.

What Happens When FOG Enters the Sewer System

When FOG goes down a drain, it travels through wastewater lines in a warm, liquid state. As it cools, it solidifies, accumulates along pipe walls, and eventually creates blockages. Over time, these blockages can cause sanitary sewer overflows — commonly called SSOs — where raw or partially treated sewage backs up and spills into streets, storm drains, waterways, or even buildings. SSOs create public health hazards, damage the environment, and expose municipalities and businesses to significant liability.

California’s regional water systems are interconnected with sensitive coastal waters, bays, and wetlands. An SSO in Los Angeles, San Diego, or Orange County does not stay contained — it has the potential to reach the Pacific Ocean, harm marine ecosystems, and trigger beach closures. That environmental sensitivity is one of the core reasons California holds food businesses to a higher standard than most states.

Why California’s Enforcement Is Stricter

California has long maintained some of the toughest environmental regulations in the nation, driven by the State Water Resources Control Board, strict implementation of the federal Clean Water Act, and ongoing consent decrees and court orders that hold local agencies accountable for SSO prevention. The result is a multi-tier regulatory framework where both state agencies and local sewer authorities have real enforcement power — and both use it.

How California’s FOG Regulatory Structure Works

Understanding how FOG compliance works in California requires understanding that there is no single rulebook. The system operates on two levels, and both affect your business.

The Two-Tier System: State and Local

At the state level, the California Building Standards Commission establishes minimum sizing and installation requirements for grease interceptors through the California Plumbing Code (Title 24, Part 5, Section 1014). The State Water Resources Control Board oversees the National Pollutant Discharge Elimination System (NPDES) and the EPA’s National Pretreatment Program requirements, which provide the legal foundation that local agencies build their FOG programs on. At the federal level, 40 CFR Part 403 bans solid or viscous waste that obstructs sewer flow — this is the rule that legally justifies grease interceptor requirements across California.

At the local level, Publicly Owned Treatment Works (POTWs) — the sewer agencies and sanitation districts that actually operate wastewater infrastructure — develop and enforce their own FOG control programs. These programs specify permit requirements, grease interceptor sizing, cleaning frequency, record-keeping obligations, hauler certification requirements, and enforcement penalties. Local programs must meet or exceed state and federal minimums, but many go considerably further.

CalRecycle’s Role in the FOG Picture

CalRecycle plays a specific and important role in California’s FOG compliance landscape. Businesses that generate used cooking oil and grease waste must ensure that waste is handled by registered waste haulers. CalRecycle oversees the certification and registration of waste haulers operating in California, and the state requires that grease waste disposal be tracked through manifest documentation. A manifest is a paper or electronic record that traces the waste from your facility to the disposal or recycling facility — creating an auditable chain of custody. Using a hauler who is not properly registered in California is a compliance violation, and it can expose your business to penalties even if your interceptor is perfectly maintained.

City-by-City Variation and the Risk of Penalties at Both Levels

One of the most important things to understand about California FOG compliance is that requirements vary substantially between cities and sewer districts — sometimes between neighboring cities within the same county. Cleaning frequency requirements, permit fees, inspection schedules, and manifest formats can all differ. Non-compliance can trigger enforcement action at both the local level (through your sewer authority or POTW) and potentially the state level, particularly for repeated violations that contribute to documented SSOs.

FOG Compliance in Los Angeles County

Los Angeles County has one of the most comprehensive FOG regulatory environments in California. Two separate entities — the LA County Sanitation Districts and the City of Los Angeles Bureau of Sanitation (LASAN) — operate distinct programs, and food businesses need to know which jurisdiction applies to their location.

LA County Sanitation Districts

The LA County Sanitation Districts serve unincorporated areas and numerous incorporated cities throughout LA County (but not the City of Los Angeles itself, which has its own authority). Their FOG Control Program requires food service establishments to install grease interceptors, maintain them, and document all service activity. Food service establishments are required to obtain pretreatment permits, and the Sanitation Districts conduct inspections to verify compliance.

City of Los Angeles Bureau of Sanitation (LASAN)

For businesses located within the City of Los Angeles, LASAN is the authority. LASAN’s FOG program is among the most detailed in the state and requires the following:

Permits and Interceptor Requirements: All food service establishments discharging grease waste are required to obtain an Industrial Wastewater Permit through LASAN. New food service establishments must install a gravity grease interceptor with a minimum capacity of 750 gallons, sized per the LA Sanitation standard and the California Plumbing Code Section 1014. Sizing is based on drain flow rates, fixture counts, and kitchen operations — LASAN performs its own plan check review for new installations and significant remodels.

The 25% Rule — Pumping Frequency: LASAN and virtually all LA County sewer agencies enforce the 25% rule. Grease interceptors must be pumped and cleaned before the combined depth of accumulated FOG and solids reaches 25% of the interceptor’s total liquid depth. In practice, most active commercial kitchens need service every 30 to 90 days depending on volume and menu type. Waiting for your interceptor to reach capacity before scheduling service is a violation — the 25% threshold is the legal trigger, not 100% full.

Certified Hauler Requirement: All grease waste removed from an LA County food service establishment must be transported by a certified waste hauler. LASAN and the Sanitation Districts maintain approved hauler lists. Using an uncertified hauler is one of the most common compliance violations in Los Angeles — and one of the most consequential.

Manifest and Record-Keeping Requirements: Every pump-out must be documented with a waste manifest that includes the date of service, the volume removed, the hauler’s name and certification number, and the disposal or recycling facility. LA regulations require that food service establishments retain these records — along with service logs and permit documents — for a minimum of three years and produce them on request during inspections.

Best Management Practices (BMPs): LASAN also requires that food service establishments implement kitchen BMPs as a condition of their permit, including dry wiping pots and pans before washing, using drain screens, and training staff to prevent FOG from entering drains.

FOG Compliance in San Diego County

San Diego County FOG requirements are administered primarily through the City of San Diego’s Metropolitan Wastewater Department and, for unincorporated areas and other member agencies, through various local sewer authorities. San Diego has developed a well-documented, permit-based program under its Food Establishment Wastewater Discharge (FEWD) program.

The FEWD Permit Program

All food service establishments within the City of San Diego are required to obtain a permit through the FEWD program. The permit ensures that facilities install the appropriate grease pretreatment equipment, operate it correctly, and maintain documentation. Failure to hold a valid FEWD permit is itself a violation, independent of whether your interceptor is functioning properly.

Grease Interceptors vs. Under-Sink Grease Traps

San Diego’s program distinguishes between full-sized gravity grease interceptors (installed outside or underground, serving the entire facility) and smaller under-sink hydromechanical grease traps (typically serving individual fixtures). For most commercial food service operations, the city requires a gravity grease interceptor. Under-sink grease traps are generally permitted only for limited food preparation establishments or specific low-volume fixtures — they are not an acceptable substitute for an interceptor for full-service restaurants and high-volume operations.

Pumping and Inspection Frequency

San Diego regulations require that grease traps and interceptors be cleaned at a minimum frequency of every 90 days, regardless of their fullness level. However, the practical standard is consistent with the 25% rule — facilities must pump whenever they reach 25% capacity, which for busy operations often means service is required more frequently than every 90 days. The city conducts periodic inspections and can require more frequent pumping based on inspection findings or prior violation history.

Non-Compliance Consequences

San Diego can issue compliance orders, require corrective action, and assess surcharges and penalties for non-compliant discharges. Repeated violations or documented contributions to sewer overflows can result in escalating enforcement responses, including permit suspension. Businesses that discharge FOG in concentrations exceeding the permitted limits may be subject to surcharges added to their sewer service bills.

San Diego County agencies outside the City — including the City of Chula Vista, Escondido, and others — operate their own FOG programs aligned with similar requirements. Several of these programs charge an annual grease control fee as part of business license renewals or sewer permit fees.

FOG Compliance in Orange County (Santa Ana Area)

Orange County’s FOG regulatory framework is anchored by the Orange County Sanitation District (OC San), which serves a large portion of the county. In addition to OC San’s regional requirements, many individual cities within the county — including Santa Ana — enforce their own local FOG programs.

OC San’s FOG Program and Ordinance OCSD-25

OC San’s Board of Directors adopted FOG Ordinance OCSD-25, which establishes the legal authority to prohibit food service establishments from discharging FOG to the sewer system in concentrations that cause blockages or overflows. Key requirements under OCSD-25 include:

FOG Wastewater Discharge Permit: All food service establishments within OC San’s service area are required to obtain a FOG Wastewater Discharge Permit. There is a permit fee associated with this requirement. Limited food preparation establishments (those with minimal cooking activity) may qualify for an exemption, but the determination is made by OC San on a case-by-case basis.

Grease Interceptor Installation: Most food service establishments are required to install a grease interceptor. Under the ordinance, existing establishments that have been identified as contributors to FOG-related sewer problems are required to install an interceptor within 180 days of notification. New construction and remodels must comply before receiving connection approval.

Pumping Frequency and Certified Haulers: OC San requires that grease interceptors be maintained and serviced by certified waste haulers. Pumping must occur frequently enough to keep FOG and solids below 25% of the interceptor’s total capacity. Service intervals typically range from monthly to quarterly depending on the facility’s output.

Record-Keeping and Manifests: All service records, waste manifests, and disposal documentation must be retained by the food service establishment and made available for inspection. OC San’s program specifically requires that manifests be completed by the hauler at the time of service and that a copy be retained by the establishment.

City-Level Requirements on Top of OC San

Within OC San’s service area, individual cities add their own requirements. The City of Santa Ana, for example, has adopted its own FOG Control Program Guidebook, which mirrors and supplements OC San’s ordinance requirements. The City of Fountain Valley, the City of Fullerton, and other OC municipalities have similarly adopted local FOG control ordinances. In these cases, food service establishments must comply with both OC San’s regional permit requirements and the local city program — whichever is more stringent.

This layered structure means that a restaurant in Santa Ana may need to coordinate with both OC San and the City of Santa Ana to ensure full compliance. We work with businesses throughout Orange County and can help clarify exactly which requirements apply to your specific address.

What Restaurants and Food Businesses Need to Do to Stay Compliant

Regardless of which Southern California jurisdiction you operate in, the core compliance steps are consistent. Here is what every food service establishment should have in place.

Install the Right-Sized Grease Interceptor

The interceptor must be properly sized for your facility’s flow rate, fixture count, and operational volume. Undersizing is one of the most common compliance failures we see — owners install a unit that meets minimum requirements on paper but is inadequate for how the kitchen actually operates. Work with a licensed plumber and confirm sizing with your local sewer authority before installation. Most jurisdictions require a plan check and approval before installation.

Work Exclusively with Registered, Certified Haulers

California requires that your grease waste be transported by a registered waste hauler. Before you schedule any service, verify that the hauler holds current registration with the appropriate California agencies and is on your local sewer district’s approved hauler list. This is non-negotiable — using a non-certified hauler is a violation even if the service was performed correctly.

Maintain Proper Waste Manifests and Service Records

Every pump-out must generate a manifest documenting the date, volume, hauler name, hauler certification number, and the receiving facility. Keep these records organized and accessible. California programs typically require a minimum three-year retention period, and inspectors can and do ask to see them. Incomplete or missing manifests are among the most common triggers for compliance notices.

Schedule Regular Service — Do Not Wait for an Inspection

FOG compliance is a proactive obligation, not a reactive one. Waiting until your interceptor is visually full, until you receive an inspection notice, or until you have a backup event is waiting too long. Establish a regular service schedule based on your kitchen volume and the 25% rule, confirm the schedule with your hauler, and stick to it.

Train Kitchen Staff on Best Management Practices

The best grease interceptor in the world can only handle so much load. Front-of-house and kitchen staff should be trained to scrape plates and cookware into the trash before washing, avoid pouring cooking oils and fryer grease directly into drains, and use drain screens on all floor drains and sink drains. These practices meaningfully reduce the FOG load entering your interceptor and extend the intervals between pump-outs.

Keep a Compliance Binder

Organize your permits, interceptor sizing documentation, service manifests, pump logs, and inspection reports in one place. A compliance binder should be readily accessible to management. If an inspector shows up, you want to be able to produce documentation immediately — not spend hours searching for records.

Common Compliance Mistakes That Lead to Fines

Enforcement actions in Southern California are real, and they follow predictable patterns. These are the mistakes we see most often.

Using a Non-Certified Hauler

This is one of the most significant compliance errors in California. A business may be pumping on schedule and maintaining records, but if the hauler is not properly certified and registered, every one of those service events is a potential violation. Verify hauler credentials before every new service relationship, and re-verify annually.

Irregular Pumping Schedules and Waiting Until the Trap Is Full

Some operators treat the grease interceptor as something to deal with only when it becomes a visible problem. California’s 25% rule means you are legally required to pump well before the unit is full. Running a heavy-volume kitchen for months without service almost guarantees a violation when an inspector checks the interceptor.

Missing or Incomplete Waste Manifests

A manifest that is missing the disposal facility, the hauler’s certification number, the volume removed, or the service date is not a compliant manifest. Inspectors look at the completeness of documentation, not just whether you have paperwork. Require your hauler to provide complete, legible manifests at the time of service.

Improperly Sized Grease Interceptor

An interceptor that was appropriately sized for a previous tenant’s coffee shop operation may be completely inadequate for a high-volume full-service restaurant. Changes in kitchen equipment, menu, or meal volume can push an interceptor beyond its design capacity. If your operation changes significantly, consult with your sewer authority about whether a resizing or second unit is warranted.

Not Updating Records When Operations Change

Adding a fryer, switching to a higher-volume menu, or expanding kitchen capacity can change your FOG output significantly. In many jurisdictions, changes to your kitchen configuration require updating your permit or notifying your sewer authority. Failing to do so can result in a permit violation, especially if your interceptor is found to be undersized relative to current operations.

How Southwaste Helps Southern California Businesses Stay Compliant

We serve food service establishments throughout Southern California — from Bakersfield down through Los Angeles County, Orange County, San Diego County, and to the Mexican border. Our team works with restaurants, food manufacturers, institutional kitchens, and commercial facilities across this entire region every day, and FOG compliance is a core part of what we do.

We are registered and certified to operate as a grease waste hauler in California, which means every service we provide comes with properly completed manifests that meet state and local requirements. When we pump your interceptor, you receive documentation you can keep, file, and produce during an inspection without concern.

Our team understands the specific program requirements across Los Angeles, Orange County, and San Diego — the differences between LASAN’s Industrial Wastewater Permit requirements, OC San’s OCSD-25 framework, and San Diego’s FEWD program. We do not apply a one-size-fits-all approach, because the regulations themselves are not one-size-fits-all.

We provide grease trap pumping and cleaning, grease interceptor service, grit trap and oil separator service, vacuum truck services, hydro-jetting, commercial plumbing, and liquid waste recycling and disposal. If your interceptor is undersized, clogged with buildup from deferred service, or needs a full hydro-jet cleaning to restore capacity, our team can handle it.

We also understand that scheduling is one of the most common reasons businesses fall behind on compliance. We make it straightforward to set up a recurring service schedule that fits your kitchen’s actual volume and meets your jurisdiction’s frequency requirements — so compliance becomes routine rather than reactive.