What’s in This Article
Key Takeaways
- A grease trap or grease interceptor separates fats, oils, and grease from wastewater before it reaches the sewer, protecting the pipe from clogging and the sewer authority from a costly cleanup.
- Connecticut’s food code, adopted from the FDA Food Code, governs food safety. It does not set grease trap or interceptor sizing. That is a plumbing code and local sewer authority question.
- Every Connecticut food establishment falls into Class 1 through Class 4, defined by statute, based on the complexity of what is prepared. Your class affects inspection frequency, not your plumbing.
- No food establishment may operate without a permit from the local director of health, separate from any plumbing or sewer approval.
- Grease and ventilation systems are why a second-generation restaurant space is often worth more than a comparable shell, and why a shell requires a much larger build-out budget than most tenants expect.
Search “grease trap requirements” and you will find a lot of confident-sounding advice that names the wrong authority. The health code does not set your grease trap size. Knowing who actually decides is the difference between a build-out that clears on schedule and one that stalls on a technicality nobody checked early.
What a Grease Trap Actually Does
A grease trap, sometimes called a grease interceptor depending on size and location, sits in the wastewater line between a kitchen’s sinks and the building’s connection to the sewer. Hot greasy water cools as it moves through the trap, the fat and oil separate and float, and the relatively clean water underneath continues to the sewer. Someone, either the operator or a service contractor, pumps out the accumulated grease on a schedule.
Skip it, undersize it, or neglect the pump-out schedule, and grease travels downstream, cools, and solidifies in the pipe. That is how a restaurant’s kitchen becomes a sewer authority’s problem, which is exactly why the requirement to have one, and to maintain it, does not come from the state’s food safety rules.
The Health Code Does Not Set Grease Trap Size
This is worth stating plainly because it corrects a common assumption. Connecticut’s food establishment framework changed in 2023. The old public health code section that governed food service sanitation, Section 19-13-B42, was repealed effective February 17, 2023. In its place, the Department of Public Health now administers food safety through a different structure entirely.
Connecticut adopted the FDA Food Code wholesale rather than writing its own sanitation rules from scratch. The Food Code governs food handling, temperature control, employee health, and sanitation practices in detail. What it does not do, and what no part of the state’s food establishment statutes do, is specify how large a grease trap or interceptor has to be for a given kitchen. That number comes from plumbing code requirements and the local sewer authority’s own rules, which is the next section.
What the Health Code Does Regulate: Your Class
What Connecticut’s food establishment law does specify, in real detail, is a classification system that sorts every food establishment into one of four categories based on what the kitchen actually does. Section 19a-36g defines them:
| Class | What it covers |
|---|---|
| Class 1 | Commercially packaged food in original packaging, or prepackaged precooked food heated and served within 4 hours in its original package, or food that is not time or temperature controlled for safety |
| Class 2 | A limited menu prepared or cooked and served immediately, or food requiring hot or cold holding but not cooling |
| Class 3 | Complex preparation, including handling raw ingredients, cooking, cooling, and reheating for hot holding |
| Class 4 | Serves a population highly susceptible to food-borne illness, such as preschools, hospitals, or nursing homes, or uses specialized processes like smoking, curing, or reduced oxygen packaging |
This classification affects inspection frequency and regulatory scrutiny, not plumbing. A Class 3 concept, handling raw ingredients through cooking, cooling, and reheating, is exactly the kind of operation that also tends to generate the most grease, but the class itself is a food safety category, not a plumbing sizing input. The two questions run in parallel, decided by different offices, and conflating them is where people go wrong.
Separately, Section 19a-36i requires a permit before any food establishment can operate: “No person, firm or corporation shall operate or maintain any food establishment where food or beverages are served or sold to the public in any town, city or borough without obtaining a valid permit to operate from the director of health.” That permit is a food safety approval. It is not a substitute for whatever the sewer authority and the plumbing inspector require.
The Two Authorities That Actually Decide
Who actually sets grease trap requirements
- The local building official and plumbing code. The State Building Code, through its plumbing provisions, requires grease interceptors for food service wastewater and sets the technical installation standards. This is a licensed plumber’s and building official’s determination, made against the current code edition and the specific kitchen.
- The local sewer or water pollution control authority. Many Connecticut sewer authorities run their own fats, oils, and grease programs, sometimes called FOG programs, with local sizing requirements, pump-out schedules, and discharge limits that can be stricter than the base plumbing code. These vary town to town.
- The local director of health. Issues the food establishment permit under Section 19a-36i, covering food safety, not plumbing.
Three offices, three different questions, and a restaurant build-out needs all three to say yes. The plumbing official and the sewer authority are the ones with the actual numbers. Neither the state’s food code nor DPH’s local director of health has the sizing formula, so asking the health department for a grease trap size is asking the wrong office, even though it feels like the obvious first call for anything with “food” in the name.
Why This Is a Real Estate Problem, Not Just a Kitchen Problem
A grease trap or interceptor is not a small line item. Interior traps installed under a sink are relatively inexpensive. Exterior interceptors, the larger tanks required for higher-volume kitchens, involve excavation, site work, and a real construction budget, and they take real square footage or yard area that a shell space may not have room for.
This is exactly why a second-generation restaurant space, meaning a space where the previous tenant already installed a hood, ventilation, and grease system, commands a premium over a comparable shell. The buyer or tenant is not just paying for four walls. They are paying to skip a permitting and construction sequence that touches the plumbing official, the sewer authority, and often the fire marshal for the hood suppression system, all before a single burner gets turned on.
If you are underwriting a restaurant deal, verify what is actually in place, not what the space “looks like” it could support. An existing grease trap sized for a Class 2 sandwich shop is not automatically adequate for a Class 3 concept doing full raw-ingredient prep. Get the existing system’s documentation and confirm it with the sewer authority before assuming it transfers to your concept.
Rough build-out cost comparison
Arithmetic only, using figures you supply. This does not estimate actual grease trap or hood costs, which vary by kitchen size, equipment, and local requirements. Use it to compare a shell scenario against a second-generation scenario once you have real contractor numbers for each.
| Shell build-out cost, amortized over your lease term | – |
|---|---|
| Existing system covers your full lease term | – |
What to Do Before You Sign a Restaurant Lease
Call the sewer authority before you call the health department
Ask specifically about their fats, oils, and grease program, sizing requirements, and pump-out rules for your projected volume. This is a different office from the one that issues your food establishment permit.
Confirm your class, separately
Know whether your concept is Class 1 through Class 4 under Section 19a-36g. It shapes your health inspections, and it is a useful shorthand for how complex your kitchen operation actually is when discussing the space with a plumber.
Get documentation on any existing grease system
Size, install date, last service record, and whether it was ever approved for the volume and type of cooking you plan to do. A system sized for a previous, simpler concept may not be adequate for yours.
Price the shell scenario honestly if there is no existing system
Exterior interceptors involve site work, not just a plumbing fixture. Get a real contractor number before you sign, not an estimate based on what a similar space cost someone else.
Sequence your permits correctly
The food establishment permit, the building and plumbing permit, and the sewer authority approval are separate approvals from separate offices. None of them substitutes for another, and a lease commencement date should not assume any single approval covers what the others require.
Restaurant and food service space
Looking for a Restaurant Space, or an Established Restaurant?
Whether you want a shell to build out, a second-generation space with a hood and grease system already in place, or an operating restaurant with the business attached, the checklist is the same and most of it is not the rent. Ventilation, grease, seating count, permits, and parking decide these deals.
Commercial Connection has food service properties across Connecticut and represents buyers and tenants looking for them. Licensed in CT and MA, established 2001.
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Or read how to buy a restaurant in Connecticut, the 20 questions to ask first, or how to find and evaluate restaurants for sale.
Frequently Asked Questions
Does the health code set grease trap size requirements in Connecticut?
No. Connecticut’s food establishment law, under Section 19a-36h, adopts the FDA Food Code by reference to govern food safety, and its classification system under Section 19a-36g sorts establishments into Class 1 through Class 4 based on food handling complexity. Neither addresses grease trap or interceptor sizing. That is set by the plumbing code, administered by the local building official, and often by additional requirements from the local sewer or water pollution control authority.
What are the food establishment classes in Connecticut?
Under Section 19a-36g, Class 1 covers commercially packaged or simply reheated food with no complex handling. Class 2 covers a limited menu prepared and served immediately, or food requiring holding but not cooling. Class 3 covers complex preparation including raw ingredient handling, cooking, cooling, and reheating. Class 4 covers establishments serving highly susceptible populations, such as preschools, hospitals, or nursing homes, or using specialized processes like smoking or curing. The class affects inspection frequency, not plumbing requirements.
Who do I actually call about grease trap requirements for a restaurant space?
Two offices, not the health department. Your local building official can confirm plumbing code requirements for grease interceptors, and your local sewer or water pollution control authority can confirm any additional fats, oils, and grease program requirements specific to that town, including sizing and pump-out schedules. The food establishment permit from the local director of health is a separate approval covering food safety.
Is a health permit the same as a plumbing or sewer approval for a restaurant?
No. Section 19a-36i requires a food establishment permit from the local director of health before operating, stating plainly that “no person, firm or corporation shall operate or maintain any food establishment where food or beverages are served or sold to the public in any town, city or borough without obtaining a valid permit to operate.” That permit covers food safety. It does not substitute for building, plumbing, or sewer authority approvals, which are separate processes.
Why does a second-generation restaurant space cost more than a comparable shell?
Because the grease trap or interceptor, hood, and ventilation system already installed in a second-generation space represent real construction cost and a permitting sequence the buyer or tenant gets to skip. Exterior interceptors in particular involve excavation and site work, not just a plumbing fixture. Confirm any existing system is documented, properly sized, and adequate for your specific concept before assuming it transfers.
Official sources and where to check
- Chapter 368a, Connecticut General Statutes. Public health, food establishments.
- Section 19a-36g, within Chapter 368a. Food code definitions and the Class 1 through 4 system.
- Section 19a-36h, within Chapter 368a. Adoption of the FDA Food Code by reference.
- Section 19a-36i, within Chapter 368a. The food establishment permit requirement.
- Sections 19a-36h-1 through 19a-36h-7, RCSA. The 2023 regulations implementing the food code adoption, effective February 17, 2023.
- Your local building department. The authoritative source on plumbing code grease interceptor requirements. Always a first call for any build-out.
- Your local sewer or water pollution control authority. The authoritative source on any local fats, oils, and grease program requirements, which vary by town.
Related reading on this site
- How to buy a restaurant in Connecticut
- 20 questions to ask before buying a restaurant
- Change of use permit: changing a building’s use in CT
- Special permit vs special exception in Connecticut
This article provides general commercial real estate information, not legal, engineering, or plumbing advice. It summarizes Connecticut’s food establishment statutes under Chapter 368a of the Connecticut General Statutes and the implementing regulations effective February 17, 2023. It does not describe technical plumbing code requirements for grease interceptors, which are determined by local building officials against the currently adopted code, or local sewer authority requirements, which vary by municipality. The build-out cost comparison tool performs simple arithmetic on figures you provide and is not a cost estimate. Confirm all requirements with your local building department, sewer authority, and a licensed plumber before signing a lease or beginning work. Information current as of September 14, 2026.
