TL;DR
- A grease trap and a grease interceptor are not the same thing. A trap sits under a sink and handles a single fixture; an interceptor is larger, often outdoors, and handles a full kitchen’s wastewater.
- Most Dallas County restaurants are required to have a properly sized grease trap or interceptor under local wastewater discharge rules, enforced through the city’s FOG (Fats, Oils, and Grease) control program.
- A neglected grease trap causes slow drains, sewer backups, and can result in fines from the local water utility.
- Cleaning frequency depends on kitchen volume, but most full-service restaurants need service every 1 to 3 months.
- James Armstrong Plumbing has handled commercial plumbing, including grease trap and grease line service, across Dallas County since 1995.
What Dallas County Restaurants Need to Know About Grease Trap Service
Most restaurants and food service businesses in Dallas County are required to install and maintain a grease trap or grease interceptor under local wastewater discharge rules, enforced through the city’s FOG (Fats, Oils, and Grease) control program. A neglected grease trap backs up drains, triggers sewer line blockages, and can result in fines. Cleaning frequency depends on kitchen volume, but most full-service kitchens need service every 1 to 3 months. James Armstrong Plumbing has served commercial kitchens across Dallas County since 1995.
What Is the Difference Between a Grease Trap and a Grease Interceptor?
A grease trap is a small, passive device installed under or near a single sink, typically handling one fixture’s wastewater. It holds a limited volume and needs frequent cleaning, often weekly or biweekly for a high-volume fixture.
A grease interceptor is a much larger unit, often installed outside the building underground, that handles wastewater from an entire kitchen: multiple sinks, the dishwasher, and floor drains combined. Interceptors hold far more volume and are cleaned on a longer cycle, typically every 1 to 3 months depending on kitchen output.
Which one your restaurant needs, or whether you need both, depends on your kitchen’s layout and volume, and often on what the local ordinance requires for your specific type of food service operation.
Does Your Dallas County Restaurant Need a Grease Trap?
If your business prepares, cooks, or serves food and generates wastewater containing fats, oils, or grease, the answer is almost always yes. Local wastewater utilities across Dallas County require food service establishments to install a properly sized grease trap or interceptor before connecting to the sanitary sewer system. This applies to full-service restaurants, fast food locations, cafeterias, catering kitchens, and any commercial kitchen that cooks on-site.
The exact sizing requirement depends on your kitchen’s seating capacity, meal volume, and equipment, and is typically confirmed during the permitting process when a restaurant opens or remodels its kitchen. The Texas Commission on Environmental Quality’s model grease ordinance is the state-level template most Texas cities, including several in Dallas County, base their local FOG ordinances on.
How Often Should a Grease Trap Be Cleaned?
Cleaning frequency depends on kitchen volume and the trap or interceptor’s size, but as a general rule:
- A small under-sink grease trap in a lower-volume kitchen: every 2 to 4 weeks.
- A high-volume fast food or full-service kitchen: every 1 to 2 months.
- A larger outdoor grease interceptor serving a full commercial kitchen: every 1 to 3 months.
Most local FOG programs also set a maximum fill level, often 25 percent, at which point the trap or interceptor must be pumped regardless of the calendar schedule. A kitchen running above expected volume, hosting a large event, or noticing slow drains should schedule service early rather than wait for the next cycle date.
What Happens If a Grease Trap Is Not Maintained?
A neglected grease trap or interceptor causes a predictable chain of problems. Grease builds up past the trap’s capacity and starts moving into the sewer line, where it cools, hardens, and narrows the pipe. That leads to slow-draining sinks, floor drain backups, and in the worst cases, a full sewer line blockage that shuts down the kitchen.
Beyond the plumbing problem, an overflowing or undersized grease trap is also a compliance issue. Local water utilities inspect food service establishments and can issue fines or require corrective action if a grease trap is found overflowing, undersized for the kitchen’s output, or not on a documented cleaning schedule.
What Does Grease Line Service Involve?
Grease line service covers more than just pumping the trap or interceptor itself. A thorough service typically includes:
Pumping and cleaning the trap or interceptor, removing accumulated grease, solids, and wastewater.
Camera inspection of the grease line running from the kitchen to the trap or interceptor, checking for grease buildup, blockages, or damage inside the pipe itself, not just the trap.
Hydro-jetting the line when buildup is found inside the pipe, using high-pressure water to clear grease that has already hardened on the pipe walls, rather than pumping the trap alone.
Documentation of the service date and volume removed, which most kitchens need on file for their local FOG program compliance record.
Skipping the line inspection and only pumping the trap is a common shortcut that misses grease already hardening inside the pipe, which is often what causes a backup between scheduled cleanings.
What Permits or Inspections Apply to Grease Traps in Dallas County?
Most Dallas County municipalities require a grease trap or interceptor permit as part of the commercial kitchen build-out or remodel process, issued through the local water utility’s FOG control program. The City of Dallas publishes its own grease traps and interceptors guidance through Dallas Water Utilities. Existing restaurants are typically subject to periodic inspection to confirm the trap or interceptor is properly sized, in good working order, and on a documented cleaning schedule. Requirements vary by city within Dallas County, so confirm the specific rule with your municipality’s water utility or environmental services division before assuming your existing setup is compliant, especially after a menu change, equipment upgrade, or seating expansion that increases kitchen output.
How Do You Choose a Commercial Plumber for Grease Trap Service?
Look for a plumber with specific commercial kitchen experience, not just general residential plumbing background. Ask whether the service includes a camera inspection of the grease line itself, not only pumping the trap, since that is where hidden buildup causes most repeat backups. Confirm the plumber provides documentation of each service, since that record is often required for FOG program compliance. A licensed plumber working on your grease line should hold the same Texas plumbing license required for any other plumbing work in the state. JAP’s own guide on what to look for when choosing a commercial plumber covers the same vetting questions in more depth.
When Should You Call a Licensed Plumber for Grease Trap or Grease Line Issues?
Call as soon as you notice slow drains at a kitchen sink or floor drain, a sewage smell near the kitchen, or if your grease trap or interceptor is approaching or past its scheduled cleaning date. Waiting until a full backup shuts down service costs more in emergency response and lost kitchen hours than a scheduled cleaning would have.
James Armstrong Plumbing has provided commercial plumbing service across Dallas County since 1995. James Armstrong holds Texas Master Plumber License M-39428. James Armstrong Plumbing is open Monday through Friday, 8 a.m. to 5 p.m., with same-day service available for calls placed before noon and a flat $199 dispatch fee for after-hours calls. Call 214-918-6109 or visit our contact page to schedule grease trap or grease line service.
