Grease Traps for Food Trucks: Requirements, Options, and Costs

If you operate a food truck, you have probably spent plenty of time thinking about your menu, your route, your permits, and your equipment. But have you thought about your grease trap situation?

Grease management for food trucks is a topic that confuses a lot of mobile food operators. The rules are different from brick-and-mortar restaurants, the equipment is smaller, and the requirements vary wildly depending on where you operate. Some food truck owners do not realize they need any grease management at all until a health inspector tells them otherwise.

This guide covers everything food truck operators need to know about grease traps: whether you need one, what your options are, how much they cost, and how to stay on the right side of health codes.

Do Food Trucks Need Grease Traps?

The short answer: it depends on your jurisdiction, your menu, and how your wastewater system works.

The longer answer requires understanding how food truck wastewater is handled, because that is what determines your grease trap obligations.

How Food Truck Wastewater Works

Food trucks handle wastewater in one of two ways:

1. Closed wastewater tank: Most food trucks have an onboard gray water holding tank. All wastewater from sinks goes into this tank, and the operator empties it at a commissary or approved dump station. In this system, wastewater never directly enters a sewer.
2. Direct sewer connection: Some event venues and commissary setups allow food trucks to connect directly to a sewer drain. In this case, the truck's wastewater goes straight into the municipal sewer system.

The distinction matters because grease traps exist to prevent FOG from entering the sewer system. If your wastewater goes into a closed tank that is disposed of at a permitted facility, some jurisdictions do not require a grease trap on the truck itself. If you connect to a sewer, most jurisdictions will require one.

The Commissary Factor

Most food truck operators are required to operate out of a licensed commissary — a commercial kitchen facility where you prep food, store supplies, and dispose of wastewater. The commissary has its own grease trap or interceptor that handles the wastewater you bring back from your route.

In many jurisdictions, the commissary's grease trap is considered sufficient for FOG management, and the food truck itself is not required to have a separate trap. However, this is far from universal. Some health departments require grease management at both the commissary and on the truck.

What Your Health Department Probably Requires

While requirements vary, here is what most jurisdictions expect from food trucks:

• A three-compartment sink (or approved alternative) for washing, rinsing, and sanitizing
• A separate handwashing sink
• A gray water holding tank of adequate capacity (typically 15 percent larger than your fresh water tank)
• Proper disposal of gray water at an approved facility
• A grease trap on drain lines if the truck connects to a sewer at any point
• Proper collection and disposal of used cooking oil

The safest approach is to contact every health department in every jurisdiction where you plan to operate and ask specifically about grease trap requirements for food trucks. Get it in writing if possible.

Portable Grease Trap Options for Food Trucks

If you need a grease trap for your food truck, you are looking at compact, portable units designed for small commercial applications. Here are the main types.

Under-Sink Grease Traps

These are the most common option for food trucks. They install directly under the three-compartment sink (or wherever your primary drain line runs) and intercept FOG before it reaches the gray water tank or drain.

Specifications:

• Flow rate: 7 to 25 GPM (gallons per minute)
• Grease capacity: 7 to 25 pounds
• Size: Compact enough to fit under a food truck sink (typically 12 to 18 inches wide)
• Material: Stainless steel or high-density polyethylene (HDPE)

Pros:

• Most affordable option ($150 to $300)
• Easy to install in existing food truck plumbing
• Takes up minimal space
• Easy to clean — most models have a removable basket or screen

Cons:

• Small capacity means frequent cleaning (daily for heavy-frying operations)
• Can slow drainage if undersized
• May not meet requirements in jurisdictions that mandate higher flow-rate units

Portable Free-Standing Interceptors

These larger units sit on the floor of the truck or in an exterior compartment. They handle higher flow rates and hold more grease between cleanings.

Specifications:

• Flow rate: 15 to 50 GPM
• Grease capacity: 15 to 40 pounds
• Size: Larger footprint (typically 18 to 24 inches wide)
• Material: Stainless steel, HDPE, or fiberglass

Pros:

• Higher capacity means less frequent cleaning
• Better suited for high-volume frying operations
• More likely to satisfy health inspectors in stricter jurisdictions

Cons:

• Higher cost ($300 to $600)
• Takes up valuable space in a food truck
• Heavier, which affects vehicle weight distribution

Automatic Grease Recovery Devices (GRDs)

GRDs are more advanced units that automatically skim grease from the water surface and collect it in a separate container. They are common in brick-and-mortar kitchens and are starting to appear in high-end food truck builds.

Pros:

• Most efficient grease removal (typically 98 percent or higher)
• Less manual cleaning required
• Consistent performance regardless of flow rate

Cons:

• Expensive ($800 to $2,000+)
• Requires electrical connection
• Overkill for most food truck operations

GRDs are generally only worth considering for large food trucks or trailers with very high grease output.

Sizing Your Food Truck Grease Trap

Getting the right size is important. Too small, and the trap overflows or slows your drainage to a frustrating trickle. Too large, and you waste precious space and money.

Factors That Determine Size

• Number of sinks: A standard food truck with a three-compartment sink and a handwash sink needs to handle the combined flow rate of all fixtures.
• Menu type: Heavy frying (fried chicken, french fries, donuts) produces far more grease than a sandwich or taco truck. Frying-heavy operations need larger capacity.
• Operating hours: A truck that runs 12-hour festival days needs more capacity than one that does a 4-hour lunch service.
• Local code requirements: Some jurisdictions specify minimum flow rates or grease capacities regardless of your actual needs.

General Sizing Guidelines

When in doubt, go one size up. The cost difference between a 15 GPM and a 20 GPM unit is often only $50 to $100, and the extra capacity gives you a buffer on busy days.

Cost Breakdown

Here is what food truck operators should budget for grease trap equipment and maintenance.

Equipment Costs

Annual Maintenance Costs

Food truck grease traps are small enough that most operators clean them personally rather than hiring a service company. Your main costs are your time and proper disposal of collected grease.

• Self-cleaning: Free (your labor) plus $50 to $150 per year for disposal at a permitted facility
• Commissary disposal: Often included in your commissary fees
• Professional cleaning (if required): $75 to $150 per service, 4 to 12 times per year = $300 to $1,800 annually

Most food truck operators spend $200 to $600 per year on grease trap maintenance, making it a relatively minor operating expense.

Cleaning and Maintenance for Food Truck Grease Traps

Small portable grease traps require more frequent cleaning than the large interceptors used in brick-and-mortar restaurants — but the process is much simpler.

How Often to Clean

• High-grease operations (daily frying): Clean the trap daily, ideally at the end of each service day
• Medium-grease operations: Every 2 to 3 days
• Low-grease operations: Weekly

The quarter rule still applies: clean when the grease layer reaches 25 percent of the trap's capacity. For a small under-sink trap, that can happen in a single busy day if you are running a fry-heavy operation.

How to Clean a Food Truck Grease Trap

1. Let the trap cool. Do not open it immediately after running hot water through it.
2. Remove the lid or access cover.
3. Remove the baffle or basket (if applicable) and scrape collected grease and solids into a sealable container.
4. Wipe the interior walls of the trap with a scraper or stiff brush to remove adhered grease.
5. Rinse the trap components with warm (not hot) water.
6. Reassemble the trap and ensure the lid is properly sealed.
7. Dispose of collected grease properly — at your commissary, a permitted disposal facility, or with a grease recycler.

Never dump collected grease into a trash can, a public trash receptacle, a storm drain, or on the ground. Improper disposal can result in fines and loss of your operating permit.

Permits and Inspections

Food truck permitting is handled at the local level, and grease management is one of many items inspectors check. Here is what to expect.

During the Initial Permit Inspection

When you apply for a food truck permit, the health department will inspect your truck. They will check for:

• Proper sink setup (three-compartment + handwash)
• Adequate gray water tank capacity
• Grease trap installation (if required in your jurisdiction)
• Used cooking oil storage containers
• Proof of commissary agreement (including waste disposal provisions)

Having a grease trap installed — even if your jurisdiction does not explicitly require one — demonstrates professionalism and proactive food safety management. Some inspectors view it favorably.

During Routine Inspections

Inspectors may check your grease trap during routine food truck inspections. They will look at:

• Whether the trap is clean and in good condition
• Whether it is properly connected to the drain system
• Whether you have records of cleaning and grease disposal

Keep a small log in your truck documenting each cleaning date and how you disposed of the collected grease. This simple record takes 30 seconds to update and demonstrates compliance.

The Commissary Connection

Your commissary agreement is central to your grease management strategy. When evaluating commissaries, ask these questions about grease handling:

• Does the commissary accept gray water disposal from food trucks? Most licensed commissaries do, but confirm this explicitly.
• Does the commissary have a grease trap or interceptor? It should — and it should be properly maintained.
• Can you dispose of small quantities of collected grease from your truck's trap at the commissary? This is the most convenient disposal option for most food truck operators.
• Does the commissary provide used cooking oil recycling? Many have UCO collection containers on site.
• Is grease disposal included in your commissary fees, or is it an additional charge?

A good commissary relationship simplifies your grease management enormously. All your waste goes to one place that is already set up to handle it properly.

Tips for Food Truck Operators

Based on what we hear from food truck operators and grease trap professionals, here are practical tips that save time and money:

1. Collect fryer oil separately. Never let fryer oil go down any drain. Use a dedicated container and have it picked up by a UCO recycler — many will pay you for it or at least collect it free.
2. Scrape everything before it hits the sink. The less food waste that enters your drain system, the less your grease trap has to handle, and the less often you need to clean it.
3. Use cold water for initial grease rinsing. Hot water melts grease and pushes it past the trap. Cold water keeps it solid so the trap can catch it.
4. Keep spare gaskets on the truck. A worn gasket means a leaking grease trap, which means grease in your gray water tank and potential odor issues. Replace gaskets every 3 to 6 months.
5. Budget for grease management from day one. Include grease trap equipment, maintenance supplies, and commissary disposal fees in your startup costs and monthly budget.
6. Over-communicate with your commissary. Let them know your grease disposal schedule and volume. A good working relationship prevents surprises on both sides.

The Bottom Line

Grease management for food trucks is simpler and cheaper than for brick-and-mortar restaurants, but it still requires attention. The fundamentals are straightforward:

• Check with your local health department about specific grease trap requirements for food trucks in your area
• Install an appropriately sized portable grease trap if required (or even if it is not — it protects your plumbing and shows inspectors you take sanitation seriously)
• Clean your trap regularly — daily for heavy-frying operations
• Dispose of all grease and gray water properly through your commissary or a permitted facility
• Keep simple records of your cleaning and disposal activities

A $200 grease trap and 5 minutes of daily maintenance is far cheaper than a failed inspection, a revoked permit, or a plumbing backup on your busiest day of the year.

Looking for grease trap cleaning services for your commissary or food truck operation? Request a free quote from licensed providers in your area.

Related articles:

• Grease Trap Size Guide: What Size Does Your Restaurant Need?
• Opening a Restaurant? Everything You Need to Know About Grease Traps
• Restaurant Grease Disposal Laws: A State-by-State Overview