Restaurant FOG Compliance Playbook.
Your grease trap works on physics. Your compliance obligation works on paperwork, deadlines, and inspections. This is the practical guide to what California restaurant owners and property managers must do to stay compliant with local FOG pretreatment programs — who enforces it, what they require, and what happens when you fall behind.
Key Takeaways
- Your grease trap must be pumped every 90 days maximum — with a state-issued hauler manifest on file
- The local sewer authority enforces FOG rules and can issue fines of $1,000–$25,000+ per violation per day
- A single sanitary sewer overflow traced to your property can trigger EPA involvement
- Compliance is documentation-driven — the inspector checks your records first, your equipment second
THE COMPLIANCE OBLIGATION
FOG Compliance Is Not Optional. It's a Condition of Your Discharge Permit.
Every commercial food service establishment in California that discharges wastewater into a public sewer system operates under a set of pretreatment requirements designed to keep fats, oils, and grease out of the sewer infrastructure. These requirements exist because FOG is the single largest cause of sanitary sewer overflows (SSOs) in the state — and SSOs are violations of the federal Clean Water Act.
The science of how a grease trap separates waste is covered in our companion guide, The Grease Trap: How It Actually Works. This page covers the other side of the equation — the compliance framework that determines what kind of equipment you need, how often it must be serviced, what documentation you must keep, and what happens when you don't.
If you operate a restaurant, food truck commissary, catering kitchen, hotel food service, or any commercial food preparation facility in Southern California, this playbook applies to you.
WHO ENFORCES IT
Three Agencies. Three Different Roles. All Can Fine You.
FOG compliance in California is enforced at the local level, but the authority flows from federal and state regulations. Understanding which agency does what helps you know who shows up, what they're looking for, and what kind of penalty they can impose.
Primary Enforcer
Local Sewer District
Your local sanitary district or wastewater authority administers the FOG pretreatment program in your jurisdiction. In Orange County, this is typically OCSD (Orange County Sanitation District). In Los Angeles, it's LASAN (LA Sanitation) or one of the regional districts. They set your service frequency, inspect your grease interceptor, review your manifests, and issue violation notices.
They are the agency most likely to show up at your door. Their inspectors carry the authority to issue notices of violation (NOVs), impose administrative fines, mandate corrective action, and escalate to surcharges on your sewer bill.
Health & Safety
County Health Department
Your county health department inspects commercial kitchens for food safety, sanitation, and operating conditions. A grease backup that contaminates the kitchen floor, prep areas, or storage is an immediate health department violation. Depending on severity, they can issue a point deduction on your inspection score, require corrective action, or order closure.
Health department inspectors do not typically audit your FOG manifests or measure your trap — that's the sewer district's job. But they will shut you down if a FOG-related backup creates unsanitary conditions.
Environmental
Regional Water Quality Board
California's nine Regional Water Quality Control Boards issue NPDES (National Pollutant Discharge Elimination System) permits to sewer agencies, which then cascade requirements down to individual food service establishments. If a FOG-caused SSO reaches a waterway, storm drain, or the ocean, the Regional Board can pursue enforcement directly — including penalties up to $10,000 per day per violation under the California Water Code.
This is the backstop. Most restaurant operators never interact with the Regional Board directly. But when sewer overflows reach the environment, the penalties escalate beyond anything the local district can impose.
California Water Code
Penalties for FOG-caused sanitary sewer overflows that reach a waterway, storm drain, or the ocean can reach $10,000 per day per violation under Regional Water Quality Board enforcement — in addition to any local district fines.
EQUIPMENT REQUIREMENTS
Grease Trap vs. Grease Interceptor — Which One Your Operation Needs.
The terms "grease trap" and "grease interceptor" are often used interchangeably. They shouldn't be. They are different pieces of equipment with different capacities, different installation requirements, and different service protocols. Your local code determines which one is required based on your kitchen's flow rate and food production volume.
| Attribute | Passive Grease Trap (Under-Sink / In-Floor) | Gravity Grease Interceptor (In-Ground) |
|---|---|---|
| Typical Capacity | 20–100 gallons | 500–2,000+ gallons |
| Location | Under the sink or recessed in kitchen floor | Buried outside, accessed via manhole cover |
| Best For | Low-volume: cafés, delis, food courts, break rooms | Full-service restaurants, hotels, institutional kitchens |
| Service Method | Manual cleaning by staff (daily/weekly) + professional pump-out on schedule | Licensed hauler with vacuum truck — full pump-out and manifest |
| Typical Service Interval | Professional pump-out monthly to quarterly | 30–90 days depending on volume and jurisdiction |
| State Manifest Required | Yes — for every professional pump-out | Yes — for every service visit |
| Who Determines Requirement | Local plumbing code and sewer authority FOG program | Local plumbing code and sewer authority FOG program |
Key point: Some jurisdictions also recognize Grease Removal Devices (GRDs) — mechanical units that skim or reheat collected grease into a separate container. GRDs may reduce FOG load but most California sewer authorities treat them as a supplement, not a replacement, for a gravity interceptor. Check your local FOG program requirements before installing a GRD as your primary device.
SERVICE FREQUENCY
How Often You Must Pump — and Who Decides.
Most California sewer districts set a maximum service interval of 90 days for gravity grease interceptors. Some jurisdictions require 30-day or 60-day intervals for high-volume operations. The key regulation across all jurisdictions is the 25% rule: the combined depth of floating FOG and settled sludge must not exceed 25% of the trap's total liquid depth at any time.
In practice, this means your actual service interval depends on three factors:
- Kitchen volume — A high-volume restaurant with fryers, a wok station, and a full pre-rinse may hit 25% in 30 days. A low-volume café may take 90 days.
- Menu type — Fried food programs, heavy sauce production, and high animal-fat cooking generate more FOG per seat than a salad-forward menu.
- Interceptor size — A 1,500-gallon interceptor servicing a 200-seat restaurant has a different fill rate than a 750-gallon unit serving the same volume.
Your sewer district may also require a Best Management Practices (BMP) plan that documents your kitchen's specific FOG handling procedures, disposal methods, and employee training. This is separate from the service schedule — it covers what happens between service visits.
SOUTHERN CALIFORNIA DISTRICT EXAMPLES
Requirements Vary by District.
There is no single statewide FOG compliance rule. Each sewer authority sets its own pretreatment requirements within the framework of its NPDES permit. Here are common patterns across the districts we serve:
OCSD (Orange County Sanitation District) — FOG pretreatment program requires gravity grease interceptors for full-service restaurants. 90-day maximum service interval. Manifest documentation required. Self-cleaning (under-sink) traps must be cleaned by staff weekly and professionally serviced on a set schedule.
LASAN (LA Sanitation & Environment) — Mandatory FOG ordinance. Large food service establishments (>5,000 sq ft or >200 seats) require gravity interceptors with minimum 1,000-gallon capacity. 90-day pump-out maximum. BMP plan required. Inspectors conduct unannounced visits.
IEUA (Inland Empire Utilities Agency) — FOG Control Program applies to all food service establishments. 90-day service maximum. Requires maintenance log and manifests available for inspection. Interceptor sizing based on flow rate calculations from the Uniform Plumbing Code.
City of San Diego — FOG Program administered by the Public Utilities Department. Grease interceptors required for all food service establishments generating FOG. 90-day service maximum. Annual permit required. BMP plan and employee training documentation required.
DOCUMENTATION REQUIREMENTS
The Paperwork That Keeps You Compliant.
FOG compliance is as much about documentation as it is about equipment maintenance. When a sewer district inspector arrives, they're reviewing your records before they look at your trap. Missing a single manifest can result in a violation — even if the trap itself is clean. Here are the documents you must maintain:
Per-Service
State Hauler Manifest
California law requires a state manifest for every grease trap pump-out. This document records the date, hauler name and license number, quantity of waste removed, trap location, and disposal facility. Your service provider generates this document. You must keep a copy on-site for a minimum of three years (some districts require five).
If your hauler does not provide a state manifest, they are operating illegally — and you are noncompliant by association.
Ongoing
Service Log / Maintenance Record
A running log of every service visit: date, type of service (pump-out, cleaning, inspection), condition findings (FOG depth before and after, baffle condition, structural observations), and service provider. Some districts provide a standard template. Others accept any format as long as the required data points are present.
This log is the first thing an inspector asks for. It demonstrates your pattern of compliance. Gaps in the log — even if you actually had service — create a presumption of noncompliance.
Program-Level
BMP Plan & Training Records
Best Management Practices documentation covers your kitchen's FOG handling procedures: how cooking oil is collected and stored, which fixtures discharge to the grease trap, staff training on proper disposal, and your dry-wipe protocol for pots and pans. Many districts require this as part of your FOG program enrollment.
Training records should include employee names, training dates, and a summary of what was covered. New hires should be trained within their first week. Annual refresher training is a best practice even where not explicitly required.
VIOLATION CONSEQUENCES
What Happens When You Fail. The Penalties Escalate Fast.
FOG violations don't start with a fine. They start with a notice. But each step you fail to resolve compresses the timeline to the next penalty. Here's the typical escalation path across Southern California jurisdictions.
First Offense
$1,000–$5,000
Notice of Violation + Administrative Fine
Missed service date, expired manifests, or FOG exceeding 25% on inspection. The sewer district issues a Notice of Violation (NOV) with a corrective action deadline — typically 30 days. Administrative fine assessed. You must demonstrate compliance to clear the violation.
Repeat / Escalated
$5,000–$25,000
Increased Fines + Sewer Surcharges
Second or third violation within a compliance period. Fines increase per violation. Some districts impose FOG surcharges on your monthly sewer bill — an additional per-gallon charge for excess FOG discharge. The district may also require a reduced service interval (e.g., from 90 days to 30 days) at your expense.
SSO or Continued Non-Compliance
$10,000–$50,000+
Closure, Legal Action, Environmental Penalties
If FOG causes a sanitary sewer overflow (SSO), the Regional Water Board can pursue enforcement under the California Water Code — up to $10,000 per day per violation. The health department can order immediate closure if backup contaminates the kitchen. Continued non-compliance can result in revocation of your sewer discharge permit — which means you cannot legally operate.
FOG COMPLIANCE CHECKLIST
Daily, Weekly, Quarterly, and Annual FOG Management Tasks.
Print this. Post it in the kitchen manager's office. Use it to assign responsibilities and track completion. Every item on this list is either a regulatory requirement or a best practice that prevents one.
Kitchen staff responsibility — source control and prevention
Source Control
FOG Prevention at the Sink
- Dry-wipe all pots, pans, and dishes before washing (scrape FOG into trash)
- Never pour cooking oil, grease, or fat down any drain
- Dispose of used cooking oil into sealed collection container for recycling
- Use sink strainers in all kitchen sinks — empty into trash, not disposal
Kitchen Operations
Floor & Fixture Management
- Dry-sweep kitchen floor before mopping (reduce FOG entering floor drains)
- Clean hood filters on schedule — do not rinse grease-laden filters in the sink
- Check under-sink trap (if applicable) for visible grease buildup
- Verify "No Grease" signage is posted at all wash stations
Kitchen manager or designated staff — inspection and cleaning
Under-Sink Traps
Passive Grease Trap Maintenance
- Remove and clean under-sink grease trap (if your operation uses passive traps)
- Scrape accumulated FOG into sealed trash bag — do not dump down drain
- Inspect trap gaskets and connections for leaks
- Log cleaning date and initials in maintenance record
Oil & Waste
Cooking Oil Collection & Storage
- Check cooking oil collection container level — schedule pickup if near capacity
- Verify container lid is sealed and no spillage on ground or dumpster pad
- Confirm recycling hauler is on schedule for next pickup
- Inspect outdoor area around interceptor access for grease spillage
Licensed service provider required — professional pump-out and documentation
Grease Interceptor
Professional Pump-Out & Inspection
- Schedule licensed hauler for full pump-out (do not exceed your district's maximum interval)
- Measure and record FOG depth and sludge depth before service
- Pump all compartments — full pump-out, not partial skim
- Inspect inlet and outlet baffles for damage, displacement, or grease bypass
- Verify structural integrity of tank walls and access covers
Documentation
Manifest & Record Filing
- Obtain state hauler manifest — verify hauler license number and disposal facility
- File manifest copy on-site in your FOG compliance binder
- Update service log with date, service type, condition findings, and provider
- Compare service date to prior visit — confirm you are within your required interval
- Forward copy to property manager or landlord if required by lease
Management and compliance review — permits, training, and program assessment
Compliance Review
Program Audit & Permit Renewal
- Review all manifests for the year — verify no gaps in service interval
- Confirm FOG program permit is current with your sewer district (renew if required)
- Review BMP plan — update for any menu changes, equipment additions, or staffing changes
- Verify service provider's hauler license and insurance are current
Training & Assessment
Staff Training & System Evaluation
- Conduct annual FOG awareness training for all kitchen staff (document attendees and date)
- Train new hires within first week on dry-wipe protocol and disposal procedures
- Evaluate interceptor sizing — has kitchen volume changed? Is the current trap adequate?
- Assess whether service frequency should be adjusted based on historical FOG depth data
COMMON VIOLATIONS
The Six Most Frequent FOG Violations — and How to Avoid Each One.
After 62,000+ service calls across Southern California, these are the violations we see repeatedly. Every one of them is preventable.
Violation #1
Missed or Late Service Date
The most common violation. The service was due at 90 days. It happened at 95 days — or 120, or never. Inspectors check the date on your last manifest against your required interval. Even five days late counts as a violation.
Prevention: Put your service on a managed schedule with a provider who tracks your interval and contacts you proactively. Do not rely on your own calendar — kitchen operations will always push it to "next week."
Violation #2
Missing or Incomplete Manifests
The service happened, but you can't produce the manifest. Or the manifest is missing required fields — no disposal facility, no hauler license number, no volume recorded. Incomplete documentation is treated the same as no documentation.
Prevention: Designate one location for all manifests — a physical binder or a digital folder. Verify every manifest is complete before filing. Your service provider should hand you a complete document at the end of every visit.
Violation #3
FOG Exceeding 25% of Trap Capacity
The inspector measures and the combined grease cap plus sludge layer exceeds 25% of the liquid depth. This means the trap is not being serviced frequently enough — or the interceptor is undersized for the kitchen's output.
Prevention: If you're consistently hitting 25% before your scheduled service date, your interval is too long. Shorten it. If you're at 25% within 30 days of a fresh pump-out, your interceptor may be undersized — consult your plumber for a flow-rate analysis.
Violation #4
Improper FOG Disposal
Used cooking oil dumped in the parking lot, down a storm drain, or in a trash dumpster. Grease scraped from the trap and bagged with regular trash without proper containment. These are environmental violations that can trigger penalties from both the sewer district and the Regional Water Board.
Prevention: Contract a licensed cooking oil recycler. Provide sealed containers for used oil. Train staff that FOG waste is regulated material — it cannot be disposed of as regular trash or discharged to the environment.
Violation #5
Damaged or Missing Baffles
The inlet or outlet baffle inside the interceptor is cracked, displaced, or missing entirely. Without functional baffles, the trap cannot separate FOG from the discharge — grease passes straight through to the sewer line. Inspectors check baffle condition on every visit.
Prevention: Your service provider should inspect baffles on every pump-out and report any damage. Baffle repair is a standard service item — it should never go unreported or unresolved between visits.
Violation #6
No BMP Plan or Training Records
The inspector asks for your Best Management Practices plan and employee training documentation. You don't have one. Or you have a plan from 2019 that doesn't reflect your current kitchen operations. In districts that require BMP plans, this is a citable violation.
Prevention: Create a one-page BMP plan that covers oil disposal, dry-wipe protocols, sink usage rules, and employee training. Update it annually. Keep signed training acknowledgments from every kitchen employee.