Grease management is one of the most overlooked aspects of food truck operations, yet grease trap violations rank among the most common health department citations for mobile food vendors. Every food truck that produces grease-laden wastewater — which includes virtually every truck that cooks food — needs a grease trap or grease interceptor to prevent fats, oils, and grease from entering the wastewater system. Proper sizing, regular cleaning, and compliant disposal protect your operating permit, prevent plumbing failures, and keep your truck running smoothly. This guide covers the requirements you need to know.
A grease trap is a plumbing device that captures fats, oils, and grease (FOG) before they enter the wastewater stream. In a food truck, the grease trap sits between your sink drains and your wastewater holding tank, intercepting FOG as wash water flows through. Without a grease trap, grease accumulates in your wastewater tank, clogs drain lines, and can overflow — creating both a health code violation and an environmental hazard.
Food truck grease traps are smaller than restaurant models because they handle lower volumes, but they require more frequent cleaning because of their limited capacity. A typical food truck grease trap holds 8 to 40 pounds of grease, depending on the model. Standard sizes range from a 4-gallon (15-liter) internal unit to a 20-gallon (75-liter) external unit.
The grease trap works through gravity separation. Wastewater enters one side of the trap and flows slowly through a series of baffles. Grease, which is lighter than water, floats to the surface and is retained behind the baffles. Cleaner water exits the other side and flows into your wastewater tank. As the trap fills with grease, its efficiency decreases — a trap that is more than 25% full of accumulated grease is no longer effectively separating FOG from wastewater.
Most health departments require food trucks to have a grease trap if they produce any grease-laden wastewater. Some jurisdictions specify minimum trap sizes based on the number of sinks and the types of cooking performed. Check your local regulations before purchasing — an undersized trap may not pass inspection even if it is functioning correctly.
Size your grease trap based on your cooking volume and menu type. High-grease menus (fried foods, BBQ, burgers) generate more FOG and need larger traps. Low-grease menus (coffee, sandwiches, salads) can function with smaller units. As a general rule, if you operate a deep fryer, select a trap rated for at least 20 pounds of grease capacity.
Install the grease trap where it is accessible for cleaning — you will need to open and clean it frequently, so burying it behind equipment or under counters creates a maintenance barrier. Many operators install the trap in an exterior compartment or under the truck frame with an access panel. The trap must be level to function properly; an unlevel trap allows grease to bypass the baffles.
Connect your three-compartment sink and any food prep sinks to the grease trap inlet. Your handwashing sink typically does not need to flow through the grease trap because handwashing water does not contain significant FOG. However, verify this with your local health department — some jurisdictions require all wastewater to pass through the grease trap.
Ensure adequate ventilation around the grease trap to prevent odor buildup. Grease traps that are infrequently cleaned or poorly ventilated develop strong odors that can affect food quality and customer experience. A vented trap cover and proper drain line slope help minimize odor issues.
Clean your grease trap at a frequency that prevents it from exceeding 25% capacity. For most food trucks, this means cleaning every one to seven days depending on your cooking volume and menu type. High-volume frying operations may need daily cleaning. Lower-grease operations may manage with weekly cleaning.
The cleaning procedure begins with removing the trap cover and scraping accumulated grease from the surface and baffles into a separate collection container. Do not dump collected grease into your wastewater tank, down a drain, or onto the ground. Wipe the interior walls and baffles with paper towels or a scraper to remove adhered grease. Flush the trap with hot water (not boiling, which can damage some trap materials) and reassemble.
Document every cleaning in your maintenance log, noting the date, the amount of grease removed (estimated), and any issues observed. Health inspectors may ask to see your cleaning records, and a well-maintained log demonstrates your commitment to compliance.
Professional cleaning services can supplement your routine maintenance. Some grease management companies service food trucks on a scheduled basis, removing accumulated grease and disposing of it at licensed facilities. This service typically costs $75 to $200 per visit and may be required by your jurisdiction if you generate more than a certain volume of FOG waste.
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Try it free →Your food truck generates wastewater from cooking, dishwashing, handwashing, and cleaning. This wastewater must be disposed of at an approved facility — never into storm drains, on the ground, or into any unapproved drainage system. Illegal wastewater disposal can result in significant fines and immediate permit revocation.
Approved disposal options include your commissary kitchen's grease waste system, a licensed wastewater treatment facility, or an approved dump station. Many commissary kitchens include wastewater disposal in their rental agreement. If your commissary does not offer this service, identify the nearest approved dump station and factor the travel time into your daily schedule.
Maintain records of your wastewater disposal, including dates, volumes, and disposal locations. Some jurisdictions require these records as part of your operating permit renewal. A record showing consistent, compliant disposal protects you during inspections and demonstrates responsible environmental practices.
Used cooking oil from fryers is a separate waste stream from wastewater. Store used oil in sealed containers and arrange for pickup by a licensed cooking oil recycler. Many recycling companies will collect used oil at no cost because they convert it into biodiesel or animal feed ingredients. Never mix used cooking oil with your general wastewater — it overwhelms your grease trap and contaminates the wastewater stream.
Proactive grease management prevents the most common grease-related problems on food trucks: clogged drains, overflowing wastewater tanks, pest attraction, and unpleasant odors. These problems affect food safety, customer experience, and your ability to pass inspections.
Scrape all dishes and cookware before washing. Remove as much food and grease as possible with a rubber scraper or paper towels before using water. This simple step reduces the grease load on your trap by 50% or more and extends the time between cleanings.
Use hot water and appropriate detergents for washing, but avoid using excessive amounts of degreasing chemicals. Strong degreasers can emulsify grease and push it through the trap rather than allowing it to separate. Follow your detergent manufacturer's recommended dilution ratios.
Inspect drain lines monthly for grease buildup. Slow-draining sinks are the first sign of grease accumulation in your plumbing. If you notice slow drainage, clean the trap and flush the lines before the problem escalates to a complete blockage. A clogged drain during service means you cannot wash dishes or hands — an immediate food safety and health code issue.
Clean your grease trap when it reaches 25% capacity, which typically means every one to seven days depending on your cooking volume and menu type. High-volume frying operations may need daily cleaning. Low-grease operations like coffee or sandwich trucks may clean weekly. Document every cleaning in your maintenance log.
Sizing depends on your cooking volume and menu type. Most food trucks need a trap rated for 8 to 40 pounds of grease capacity. Trucks with deep fryers should select at least a 20-pound capacity trap. Check your local health department for specific sizing requirements, as some jurisdictions specify minimum capacities based on equipment.
Dispose of grease waste at approved facilities only: your commissary kitchen's grease waste system, a licensed wastewater treatment facility, or an approved dump station. Never dump grease in storm drains, dumpsters, or on the ground. Used cooking oil should be collected separately by a licensed oil recycler. Keep disposal records for health department inspections.
Grease management is the unglamorous foundation of a clean, compliant food truck operation. Size your trap correctly, clean it before it reaches capacity, dispose of waste at approved facilities, and document everything. The operators who stay on top of grease management avoid the plumbing emergencies, pest problems, and health department citations that plague those who treat it as an afterthought.
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