August 12, 2026
BY DUNCAN DUPREEGrease Interceptors for Restaurants and Commercial Kitchens
I install grease interceptors for restaurants and commercial kitchens in Daphne and across Baldwin County. Here is how sizing, placement, and code all work.
Grease Interceptors for Restaurants and Commercial Kitchens
If you are building out or renovating a commercial kitchen in Daphne, you need a grease interceptor before you can pass inspection and open. It catches the fats, oils, and grease coming off your dish sinks, prep stations, and floor drains so that mess does not end up hardening in your sewer line or the city's main.
Get the interceptor sized and placed right and you barely think about it again. Get it wrong and you are dealing with backups, failed inspections, and pump-out headaches while you are trying to run a business.
What Does a Grease Interceptor Actually Do?
Grease does not want to go down a sewer line. It cools, it congeals, and it grabs onto everything else moving through the pipe. In a busy kitchen that adds up fast, and a clogged line at dinner rush is about the worst thing that can happen to a restaurant.
The interceptor slows the flow of wastewater long enough for the grease to separate and float, and the solids to settle. Cleaner water passes on to the sewer, and the grease stays trapped until it gets pumped out.
There are two general types. A smaller under-sink grease trap sits inside the building near the fixtures. A larger gravity interceptor is usually a big tank set in the ground outside, handling everything from a full kitchen. Which one fits depends on your kitchen's volume, your fixtures, and how your local authority wants it handled.
How Do I Size and Place One for Your Kitchen?
Sizing is the part people get wrong most often. Too small and it fills up faster than you can pump it, and grease starts carrying over into your line. Too big is money spent you did not need to spend, and it can slow the water down more than it should.
When I look at a job, I am counting your fixtures, looking at your peak flow, and figuring out what actually drains through the interceptor versus what stays out of it. Not every drain belongs on it. Toilets, for instance, do not go through a grease interceptor.
Placement matters just as much. An outdoor gravity unit needs to sit where a pump truck can reach it for cleanouts, and where the run from the kitchen keeps the right slope. In a lot of the newer commercial spots going up around Daphne and along the 98 corridor, we are working that tank location into the site plan early so it is not fighting parking or utilities later.
What Does Grease Interceptor Installation Cost?
I am not going to throw a number at you online, because it would be a guess and a guess does not help you budget. The cost of a grease interceptor installation in Baldwin County AL depends on a handful of real things:
- Interceptor size and type, indoor trap versus outdoor in-ground tank
- How far the tank sits from the kitchen and how much line has to be run
- Whether it is new construction with open ground or a retrofit into an existing building
- Excavation, and what you hit when you dig
- What your local authority requires for that specific address
Those swing the number enough that quoting without seeing the site would not be honest. Once I walk the space and look at your fixtures and your layout, I can give you a real number. This is the kind of work I do every day on the commercial construction side of the business.
What About Permits and Inspection?
Plan on this being permitted work. Commercial grease interceptors are inspected, and the requirements can differ depending on your city and whether you are on municipal sewer or septic.
What is required for your specific address in Daphne is a question for your local permitting and inspection office, and they can confirm it before you commit to anything. I handle plumbing to code and coordinate with the inspector, but I always want the requirements pinned down early so nobody is surprised at the end of a build.
If you are opening a restaurant, a convenience store with a kitchen, or a commercial laundry, the health and building requirements often run alongside the plumbing ones. Getting all of that lined up before the walls close is a lot cheaper than reworking it after.
How Do You Keep One From Failing?
An interceptor is only doing its job if it gets pumped on a schedule. When it fills past capacity, grease stops separating and starts riding through into your line, which is the exact problem you installed it to avoid.
How often you pump depends on your volume. A busy full-service kitchen needs it far more often than a place that does light cooking. Keep records of your pump-outs, because your authority may want to see them.
Down here on the Gulf Coast, heat is a factor too. Warm weather keeps grease liquid longer, which sounds good but really just means more of it can travel before it hardens somewhere you do not want it. A properly sized and maintained interceptor takes that out of the equation.
When to Give Me a Call
If you are planning a commercial kitchen build or renovation anywhere in Baldwin County and you need a grease interceptor done right the first time, let's talk before the concrete goes down. I would rather get involved early and design it in than come fix it later.
Tell me about your fixtures, your space, and your timeline, and I will come look at the site. Call or text (251) 604-2483.
