Grease Trap Cleaning in Seguin, TX
Scheduled grease trap service for Seguin restaurants, cafés, bakeries, schools and care facilities — full evacuation, baffle inspection, and the outlet line cleaned, so the trap is not the only thing that stays clear.
What is grease trap cleaning?
Grease trap cleaning is the full removal of accumulated fats, oils, grease and settled solids from a grease trap or interceptor, followed by inspection of the internal baffles and cleaning of the outlet line. It restores the device's working capacity, which is the only thing keeping FOG out of the sewer.
A partial skim of the floating grease layer is not a cleaning. Texas rules require the trap to be fully evacuated, and returning any liquid, semi-solid or solid material to the trap after servicing is prohibited.
How does a grease trap work?
A grease trap works by slowing wastewater enough for separation to occur: grease and oil float to the top, food solids settle to the bottom, and relatively clear water in the middle passes out through a baffle to the sewer. It is a settling device, not a filter, and it depends entirely on having room for the layers to form.
That is why capacity matters more than any other factor. Once the combined grease and solids layers occupy too much of the tank, the water no longer has time to separate and FOG passes straight through to your outlet line and then to the sewer main.
| Component | Function | What goes wrong |
|---|---|---|
| Inlet baffle | Slows incoming flow so separation can start | Corrodes or breaks; flow short-circuits straight through |
| Retention chamber | Holds wastewater long enough for layers to form | Fills with grease and solids; retention time collapses |
| Outlet baffle | Draws water from the middle layer only | Damaged baffle lets the grease layer discharge |
| Sample port | Allows the utility to test what you discharge | Missing on older installs; required on new and renovated builds |
| Outlet line | Carries pretreated water to the sewer | Coats with FOG that passed during overdue periods |
How often does a grease trap need cleaning?
A grease trap needs cleaning before the combined grease and solids reach 25% of the tank's capacity, which for most Seguin food service kitchens means a monthly interval for indoor traps and quarterly for larger outdoor interceptors. Your local utility sets the binding schedule, and the 25% threshold is the trigger that usually arrives first.
| Operation | Typical device | Typical interval |
|---|---|---|
| High-volume restaurant, fryers in daily use | Indoor trap or outdoor interceptor | 2–4 weeks |
| Standard full-service restaurant | Outdoor interceptor | 4–8 weeks |
| Café, bakery, coffee shop | Indoor trap | 4–12 weeks |
| School, care facility, institutional kitchen | Large outdoor interceptor | 8–12 weeks |
| Bar or venue with limited food service | Small indoor trap | 8–16 weeks |
Intervals are starting points. The correct interval for your kitchen is the one that keeps you under the threshold, which is established by measuring the layers at each service and adjusting.
Signs your trap is overdue right now
- Odour in the kitchen or near the interceptor lid. The most common first complaint, and it usually means the solids layer has been building for a while.
- Slow floor drains or a slow three-compartment sink. The trap is full and backing pressure up the line.
- Grease visible at the outlet or in the downstream line. FOG is passing through the device rather than being retained.
- Standing water around the interceptor lid. The tank is at capacity and surcharging.
- Any notice from the utility. By this point the trap has been overdue for some time.
What do Texas rules require of a food service establishment?
Texas FOG compliance is set at two levels: the Texas Commission on Environmental Quality writes the state rules, and the local sewer utility runs day-to-day enforcement and sets the binding service schedule. The utility serving your property controls the details that carry penalties.
The state-level requirements that apply regardless of city:
- Full evacuation. Under Texas Administrative Code section 312.143, a grease trap or interceptor must be fully evacuated when serviced.
- No back-discharge. Returning liquid, semi-solid or solid material to the trap after servicing is prohibited.
- Licensed hauling and manifests. Grease trap waste must be collected and transported by a properly registered transporter, with a manifest identifying the volume and nature of the material.
- Record retention. Keep your service receipts and manifests. They are what an inspection asks for first.
- Approved, correctly sized equipment. Under the TCEQ model grease ordinance, new and expanded food service facilities must design, install and maintain an interceptor in line with locally adopted plumbing codes, with the device inspected before a certificate of occupancy is issued.
- Sample port. New and renovated food preparation facilities are required to provide an adequate sampling port at the grease trap.
- Residential exemption. Grease traps are not required for residential users.
Confirm your interval with the City of Seguin
The City of Seguin's Water & Wastewater Utilities Department administers wastewater for customers inside the city limits and operates two treatment facilities — the Walnut Branch plant on East Klein Street and the Geronimo Creek plant on Seitz Road — treating over 1.4 billion gallons of wastewater a year. Because the local utility sets the binding FOG schedule, confirm your required service interval and any registration or reporting obligation with the City directly before relying on a general interval.
The Water & Wastewater Maintenance Department is at 3027 North Austin Street, and the utility line is (830) 401-2404.
The reason enforcement exists is downstream. Grease and debris are the leading cause of sanitary sewer overflows across Texas — in San Antonio, around 75% of overflows are attributed to them — and a single overdue interceptor can put solidified FOG into a public main that serves an entire block.
A proper grease trap service, step by step
Most scheduled services are completed in 45 to 120 minutes, timed around your service hours.
Measure before anything is removed
The grease layer and the solids layer are measured and recorded before the trap is opened up. Those two numbers are what set your correct interval, and without them the schedule is a guess repeated every month.
Full evacuation
The entire contents are removed — grease, water and settled solids — not just the floating layer. Partial skimming leaves the solids that are usually causing the odour and it does not meet the state requirement.
Scrape the walls, lid and baffles
Hardened grease bonded to the tank walls and the underside of the lid does not come out with the liquid. It is scraped down and removed so the tank returns to its actual rated capacity rather than its remaining capacity.
Inspect baffles and structure
Inlet and outlet baffles are checked for corrosion, cracking and displacement. A broken outlet baffle lets the grease layer discharge straight to the sewer, and a trap in that condition passes FOG no matter how recently it was pumped.
Clean the outlet line
The line from the trap to the sewer is cleared of the FOG that passed during any overdue period. This is the step most often skipped, and it is why some kitchens keep having backups despite a serviced trap.
Document and schedule
You get the measured layer depths, the volume removed, the date, and the condition of the baffles for your compliance file — plus a recommended interval based on what was actually in the tank.
Why the outlet line matters as much as the trap
Every period your trap runs over the 25% threshold, FOG passes through it and coats the outlet line on the way to the sewer. Servicing the trap restores the device and leaves that coating exactly where it is, narrowing the pipe a little more each cycle.
This is the usual explanation for a kitchen that keeps backing up despite a current service record. The trap is fine; the line downstream of it has been closing for two years. Hydro jetting removes the coating and returns the line to full bore, and on a persistent problem a camera inspection of the run to the main is worth doing once rather than guessing repeatedly.
How much does grease trap cleaning cost in Seguin?
Grease trap cleaning costs $200 to $800 per service in Seguin depending on device size, with a small indoor trap typically running $250 and a 1,000 gallon outdoor interceptor near $550. Scheduled accounts are priced below on-call rates because the volume removed is predictable.
| Device | Typical capacity | Typical Seguin price |
|---|---|---|
| Indoor under-sink trap | 20–50 gal | $175–$325 |
| Small outdoor interceptor | 500 gal | $325–$500 |
| Standard outdoor interceptor | 1,000 gal | $450–$700 |
| Large outdoor interceptor | 1,500–2,000 gal | $600–$1,100 |
| Outlet line jetting | Trap outlet through to the main | $500–$1,100 |
| Emergency or after-hours service | Added to the service price above | +$150 |
Prices are confirmed in writing before work starts. Scheduled accounts are quoted per service on an agreed interval.
What must never go into a grease trap
Additives that dissolve or emulsify grease are prohibited, because they do not remove FOG — they move it past the trap and into the sewer, which is exactly the outcome the trap exists to prevent. Introducing surfactants, solvents and emulsifiers such as enzymes, soap, diesel, kerosene and terpene to clear a grease trap is prohibited under Texas guidance.
- Enzyme and bacterial "maintenance" dosing sold as a way to extend intervals. It does not reduce your obligation and can increase what you discharge.
- Hot water flushing to "clear" the trap. It liquefies the grease layer long enough to pass the outlet baffle, then it re-solidifies in your line.
- Fryer oil and waste oil. These go to a separate waste oil container for collection, never into the trap or any drain.
- Solvents, degreasers and caustics. They damage the tank and the downstream system, and they are a compliance problem in their own right.
Grease trap FAQs
Does my business need a grease trap?
Any establishment preparing or serving food generally requires an interceptor under local FOG rules — restaurants, cafés, bakeries, butchers, delis, hotels, schools, hospitals and care facilities all fall inside the definition. Grease traps are not required for residential users. Confirm your specific obligation with the City of Seguin before assuming either way.
What is the 25% rule?
The 25% rule is the common trigger for service: clean the device before the combined grease and solids layers reach a quarter of the tank's total capacity. Past that point the retention time is too short for separation to work and FOG discharges to the sewer.
Can my kitchen staff clean the trap?
Skimming the surface is not a service, and it does not satisfy the requirement for full evacuation or the rules on transporting the waste. Grease trap waste must be collected and hauled by a properly registered transporter with a manifest recording the volume and nature of the material.
Do I have to close the kitchen during the service?
Most services are scheduled outside trading hours precisely so the kitchen keeps running. An outdoor interceptor is serviced from the yard with no impact inside; an indoor trap needs the sinks it serves to be out of use for the duration.
What records should I keep?
Keep the service date, the volume removed, the manifest, and the condition noted at each visit. Those documents are what an inspection asks for, and a consistent history is also the fastest way to justify a longer interval if your measured layers support one.
My trap was serviced last month and the sinks are still slow. Why?
A serviced trap with slow drainage usually means the outlet line is coated, not that the trap has refilled. FOG that passed during earlier overdue periods narrows the line to the sewer, and only cleaning that line restores flow. A camera run to the main confirms it in one visit.
Will a bigger interceptor mean fewer services?
A correctly sized interceptor holds more before it reaches the 25% threshold, which does extend the interval. Sizing is set by flow rate and fixture load under the locally adopted plumbing code, so it is decided by calculation rather than by choosing the largest tank that fits.