A commissary kitchen is a permitted, fixed food establishment that a food truck or cart uses as its home base. It is where the unit stores food and supplies, does prep it cannot do on board, refills fresh water, empties wastewater and gets cleaned. Most health departments in the United States expect a mobile unit to name one in its permit application, and many ask for a signed agreement from the commissary owner. The details differ by state and county, so treat everything below as a map of the usual questions, then confirm the rules with the health department where you plan to operate.
Key takeaways
- A commissary or servicing area is a fixed, approved site, never a private home.
- It covers the jobs a truck cannot do safely on the road: storage, some prep, fresh water, wastewater and cleaning.
- Many permit applications require a signed commissary agreement letter.
- How often you must return is usually set at plan review, based on your menu and equipment.
- Some places allow exemptions for fully self-contained units, but only with formal approval.
What a commissary kitchen is, in plain terms
Health codes use two related terms. Montana’s state guidance for mobile food establishments defines a servicing area as an operating base that a mobile unit “returns regularly” to for vehicle and equipment cleaning, discharging liquid or solid waste, refilling water tanks and ice bins, and restocking food and supplies. A Virginia health district’s mobile food truck guide describes a commissary as an approved food establishment where food is stored, prepared, portioned or packaged for service elsewhere, and notes that warewashing and other servicing-area jobs can happen there too if approved.
In everyday use, “commissary” tends to mean the whole package: a licensed kitchen that also lets trucks fill up, dump and clean. Some codes treat the two words as the same thing. Others split them, so a truck might store and prep food at one licensed kitchen but empty its tanks at a separate approved servicing point.
What both terms share is that the site is fixed and regulated. The Montana guidance states that a servicing area must be a fixed facility, not a temporary or mobile establishment. The Virginia guide says an approved commissary must hold a food or retail permit from the relevant state agency, and that private homes cannot be used as a commissary.
Why health departments ask for a commissary kitchen
A truck is a kitchen without permanent plumbing. The Virginia guide puts it simply: mobile units are not situated in a fixed location with permanent water and wastewater connections, so commissaries supply things like food storage, potable water and wastewater disposal.
That shapes several practical rules in the same guide:
- If the equipment on the truck cannot reach the required cooking or reheating temperatures, that cooking has to happen at the commissary.
- Food and related items may only be stored on the secured unit, at the service area, at the commissary or at a permanent food establishment, not at home.
- The wastewater tank on the unit must be at least 15 percent larger than the fresh water tank.
- Wastewater has to be emptied at an approved servicing area or by a sewage transport vehicle, never onto the ground, into waterways or into storm drains.
If you are still weighing up whether a truck suits you, our comparison of how a food truck stacks up against a fixed restaurant covers the wider trade-offs.
What usually happens at the commissary each day
The Montana guidance lists the range of services a servicing area may provide. A typical operating day maps onto those services like this:
| Stage of the day | Typical commissary task | Why it matters |
|---|---|---|
| Before service | Collect stored food, ice and dry goods; finish prep the truck cannot do | Keeps food storage in an approved, inspected place |
| Before service | Fill the fresh water tank from an approved supply | Drinking, cooking, handwashing and cleaning water must be safe |
| After service | Empty wastewater and grease at an approved point | Prevents illegal dumping and contamination |
| After service | Wash and sanitize utensils and equipment | Not every truck has space for full warewashing |
| After service | Return leftover food to proper cold storage | Time and temperature control continues off the truck |
| Any time | Restock packaging, cleaning supplies and paper goods | Keeps the truck light and organized |
The same document says the servicing area can be as simple as a storage location for packaged food or as complex as a licensed catering kitchen, depending on the type of mobile unit it serves. A cart selling only prepackaged snacks needs far less than a truck cooking raw proteins.
How often you need to go back
There is rarely a single national answer. Montana’s guidance says the scope and frequency of services must be settled at plan review and should be based on your menu, how often the unit operates, the limitations of the unit and servicing area, and how often the unit will return. It also notes that trucks travelling long distances may need extra approved servicing areas.
Plan review is where this gets fixed in writing. Our checklist of food business licenses and permits walks through the paperwork that usually surrounds it.
Commissary agreements and exemptions
The Virginia guide lists a completed commissary agreement letter among the documents needed for a mobile unit permit, alongside a menu, equipment plans and a certified food protection manager certificate. If you do not own the kitchen you use, expect to need a written agreement from a permitted operator who does.
Exemptions exist, but they are specific. Washington State law, RCW 43.20.148, requires the regulatory authority to approve an exemption from the commissary or servicing area requirement when a mobile unit meets a list of conditions. These include carrying all the equipment needed to prepare its approved menu on board, a dedicated handwashing sink, enough water and warewashing capacity, food from approved sources, wastewater and garbage removal under an approved written plan or by a licensed provider, and approval of the menu and plan of operations by the local health officer. Montana’s guidance similarly allows local offices to write a variance if a servicing area is not necessary for a particular unit.
Short events work differently again. Temporary event permits often have their own rules, covered in our temporary food event safety checklist.
Frequently asked questions
Can I use my home kitchen as a commissary?
Generally no. The Virginia guide states that private homes cannot be used as a commissary and that food and ice may not be prepared in unregulated locations. Cottage food rules, where they exist, usually cover direct sales of certain low-risk foods, not supplying a mobile unit.
Does the commissary have to be in the same county as my truck?
It depends on the jurisdiction. Some counties expect the commissary to be nearby or inspected locally, and long routes may require additional approved servicing areas. Ask the health department that will issue your mobile unit permit before you sign anything.
What should I check before signing a commissary agreement?
Confirm the kitchen holds a current food permit, what storage space you will get, the hours you can access it, where you can empty wastewater and grease, and whether you can wash equipment on site. Make sure the services listed match what your plan review requires.
Your next step
Write down your menu and the equipment on your truck, then call or visit the local health department and ask what servicing they will require and how often. Use that answer to shortlist licensed kitchens, and keep the signed agreement with your permit file. More practical guides for mobile operators are collected in our food trucks section.