A grease trap, also called a grease interceptor, is a plumbing device installed on the drain lines of commercial kitchens to capture fats, oils, and grease, collectively known as FOG, before they reach the municipal sewer system. Connecticut municipalities including Bridgeport have updated their grease interceptor standards, and food service establishments operating without properly maintained grease traps face regulatory consequences including fines, required corrective action, and potential revocation of their food service permit. For commercial drain cleaning and grease trap service throughout New Haven and Fairfield Counties, Rick’s Plumbing Service, Inc. has served commercial property owners and food service businesses since 1992. Our team holds Connecticut plumbing license P1-204379, specialty licenses S1-38776, F1-40226, ST1-400482, and HIC-0611483, and carries full general liability and workers compensation insurance. Rick’s is BBB Accredited with an A+ rating, with verified feedback on Google and HomeAdvisor. Call 203-874-6629 to schedule grease trap service today.
What a Grease Trap Is and How It Works
A grease trap is a tank installed in the drain line between the kitchen’s sinks, floor drains, and dishwasher connections and the municipal sewer system. Wastewater from these fixtures flows into the trap, where it slows down enough for the physical separation properties of FOG to take effect: fats, oils, and grease are less dense than water and float to the surface, while solid food particles sink to the bottom. The clarified water in the middle zone exits through the outlet and flows onto the sewer system. The accumulated FOG layer at the top and the solids layer at the bottom remain in the trap until the unit is cleaned and the accumulated material is removed.
When the trap is not cleaned, the FOG layer grows until it has no more room to expand and begins entering the outlet pipe, at which point it flows into the municipal sewer system in exactly the amounts the trap was designed to prevent. This progression is why cleaning frequency matters: a grease trap that fills up faster than it is cleaned provides no meaningful protection.
Two Types of Grease Management Systems in Connecticut Restaurants
Small Passive Grease Traps (Under-Sink Models)
Small passive grease traps are compact metal or plastic units installed under the kitchen sink or in a nearby drain line. Capacities range from 25 to 100 gallons. These units trap grease through the same passive separation process described above but require cleaning more frequently because their small volume fills quickly in a working commercial kitchen. Cleaning is typically performed by kitchen staff or a plumbing contractor, involving removing the cover, scooping out the accumulated FOG and solids, and cleaning the interior surfaces. Improperly cleaned under-sink traps contribute to drain odor, fruit fly infestations, and FOG discharge into the sewer.
Large Grease Interceptors (Underground or Exterior Units)
Large grease interceptors are larger-capacity underground tanks installed outside or below the building, typically ranging from 500 to 2,000 gallons or more depending on the food service operation’s FOG production volume. These units handle the combined grease output from multiple kitchen drain connections. Because of their larger volume, they do not require cleaning as frequently as under-sink traps, but they do require pumping by a licensed waste hauler and documentation of the cleaning event. Many Connecticut municipalities require grease interceptor service records to be maintained and made available for inspection.
Why FOG in the Sewer System Is a Regulated Problem in Connecticut
When fats, oils, and grease enter the sewer system uncaptured, they do not simply flow through and disappear. FOG cools as it travels through the sewer line and adheres to the pipe walls, building up layers that progressively narrow the sewer bore. In combined sewer systems like those in portions of Bridgeport, this FOG accumulation contributes to the blockages that lead to combined sewer overflow events. The EPA’s nutrient pollution and wastewater resources document the downstream effects of FOG and other organic waste reaching waterways through sewer overflows. Connecticut municipalities regulate grease management directly: the Bridgeport Water Pollution Control Authority released an updated Grease Interceptor Standard in July 2025, and the Greater New Haven Water Pollution Control Authority enforces grease management requirements for food service establishments in the service area. Violations can result in fines, required retrofitting of compliant grease management equipment, and potential disruption to the establishment’s food service permit.
How Often Does a Connecticut Restaurant Need to Clean Its Grease Trap
The cleaning frequency required depends on the type of unit, the volume and type of food service operation, and the requirements of the local municipality. General industry guidelines and Connecticut municipal standards provide the following benchmarks:
Small Passive Under-Sink Grease Traps
The industry standard trigger for cleaning a small passive grease trap is when the combined FOG and solids layer reaches 25 percent of the trap’s total depth. In a high-volume commercial kitchen, this threshold can be reached in as little as one week. In a lower-volume operation, it may take 30 days. Most food service operations clean under-sink traps weekly to monthly to remain compliant. Allowing the trap to go beyond this threshold is what allows FOG to bypass into the sewer system.
Large Grease Interceptors
Large interceptors are pumped by licensed waste haulers rather than cleaned in place. Connecticut municipalities typically require large interceptors to be serviced every 30 to 90 days depending on usage volume, with some high-volume establishments requiring monthly service. The same 25 percent rule applies to large interceptors: the unit should be pumped before the combined FOG and solids layer reaches 25 percent of total depth.
Recordkeeping Requirements
Most Connecticut municipalities that regulate grease management require food service establishments to maintain records of grease trap cleanings, including the date of service, the contractor who performed the service, the volume of material removed, and where the waste was disposed. These records may be requested during food service permit inspections. Rick’s provides service documentation for every commercial grease trap service call.
Signs Your Restaurant’s Grease Trap Needs Immediate Service
- Slow draining floor drains, sinks, or dishwasher connections in the kitchen are the most common sign that the trap is overflowing FOG into the outlet and partially blocking the downstream drain
- A strong foul or rancid odor near the grease trap or from kitchen drains, caused by the decomposition of accumulated organic material in an overloaded trap
- Grease visible in the kitchen drain water outlet or in the drain lines downstream of the trap location
- Fruit fly or drain fly activity near the grease trap or kitchen drain fixtures, which typically indicates FOG buildup on accessible drain surfaces
- A service interval that has passed the municipality’s required maximum, even if there are no visible symptoms, the 25 percent accumulation threshold may have been reached
Who Should Service a Commercial Grease Trap in Connecticut
Under-Sink Passive Traps
Small under-sink traps can be cleaned by trained kitchen staff following documented procedures, including wearing appropriate protective equipment, scooping and properly disposing of FOG and solids, and cleaning the interior surfaces and components before reassembly. However, establishing the correct cleaning frequency and confirming the trap is functioning properly requires a plumbing assessment. Rick’s Plumbing provides initial grease trap evaluation and cleaning service, and can help establish a maintenance schedule appropriate to the kitchen’s FOG production volume.
Large Interceptors
Large underground grease interceptors must be pumped by licensed waste haulers. Rick’s Plumbing provides commercial drain cleaning and maintenance for the drain lines connecting to the interceptor and can assess whether the interceptor itself is properly sized for the operation’s current FOG production.
Inspection of Drain Lines Connecting to the Trap
FOG that has escaped the trap and entered the drain lines downstream builds up over time and requires professional commercial drain cleaning, including hydrojetting, to fully clear. Rick’s provides hydrojetting of commercial drain lines and sewer camera inspection to confirm the line is clear before closing out the service.
Why Connecticut Businesses Choose Rick’s Plumbing for Commercial Drain Service
| What We Offer | What It Means for You |
| Licensed P1-204379, CT Dept. of Consumer Protection | State-certified expertise on every service call |
| Fully Insured: General Liability + Workers Comp | Zero liability on your property during every job |
| BBB Accredited, A+ Rating | Third-party verified record of homeowner satisfaction since 1992 |
| 33+ Years Serving New Haven and Fairfield Counties | Genuine local knowledge and familiarity with CT housing infrastructure |
| Verified Google Reviews and HomeAdvisor Ratings | Read real homeowner feedback before you schedule |
| Camera-First Diagnosis Before Any Repair Recommendation | You know exactly what the problem is before work begins |
| CT Green Bank / EnergizeCT Financing Available | Low-interest options for larger plumbing upgrades |
Our Process for Commercial Grease Trap and Drain Service
- Contact Rick’s at 203-874-6629 to describe the type of grease trap, the kitchen’s usage volume, and any symptoms such as slow drains or odors.
- Our commercial plumbing technician arrives with the equipment and documentation materials needed for the service visit.
- We perform the drain line assessment and cleaning service, including the grease trap maintenance, downstream drain clearing, and camera inspection if indicated.
- We provide service documentation including date, scope, and technician information for the establishment’s compliance records.
- We advise on cleaning frequency based on the actual accumulation observed during service, so the schedule matches the kitchen’s actual FOG production rather than a generic recommendation.
When to Call Rick’s Plumbing for Grease Trap Service in Connecticut
For Connecticut restaurants, cafeterias, commercial kitchens, and food service establishments in New Haven and Fairfield Counties, Rick’s Plumbing Service, Inc. provides commercial drain cleaning, grease trap assessment, and hydrojetting services that keep drain lines clear and help maintain compliance with municipal FOG requirements. We are BBB Accredited with an A+ rating, hold Connecticut license P1-204379, and carry full insurance. Call 203-874-6629 to schedule your commercial drain service today.
Frequently Asked Questions: Grease Traps for Connecticut Restaurants
What is a grease trap and why does my Connecticut restaurant need one?
A grease trap, also called a grease interceptor, is a plumbing device that captures fats, oils, and grease from commercial kitchen wastewater before it reaches the municipal sewer system. Connecticut municipalities require them for food service establishments because FOG in the sewer system creates blockages, contributes to combined sewer overflows, and damages wastewater treatment infrastructure.
How does a grease trap separate grease from wastewater?
Wastewater entering the grease trap slows down, allowing FOG, which is less dense than water, to float to the surface and solid food particles to sink to the bottom. The clarified water in the middle exits through the outlet. The accumulated FOG and solids remain in the trap until the unit is cleaned.
What does the 25 percent rule mean for grease trap cleaning?
The 25 percent rule is the standard industry trigger for cleaning a grease trap: when the combined depth of the accumulated FOG layer and the solids layer reaches 25 percent of the total trap depth, the unit should be cleaned. Beyond this point, FOG begins entering the outlet and bypasses into the sewer, defeating the purpose of the trap.
How often does a small under-sink grease trap need to be cleaned in a Connecticut restaurant?
Frequency depends on the kitchen’s volume and the type of food service. High-volume operations may need weekly cleaning. Lower-volume operations may reach the 25 percent threshold in three to four weeks. Monthly cleaning is a common minimum for many Connecticut food service establishments.
How often does a large grease interceptor need to be pumped in Connecticut?
Most Connecticut municipalities require large interceptors to be pumped every 30 to 90 days, with some high-volume kitchens requiring monthly service. The applicable interval depends on the establishment’s FOG production volume and local WPCA requirements.
What are the consequences of not cleaning a grease trap on schedule in Connecticut?
Consequences include FOG bypassing into the sewer system, drain backups within the kitchen, regulatory fines, required corrective action from the local WPCA, and potential impacts on the establishment’s food service permit.
Does the Bridgeport WPCA have specific grease trap requirements?
Yes. The Bridgeport Water Pollution Control Authority released an updated Grease Interceptor Standard in July 2025. Food service establishments in Bridgeport should confirm their grease management equipment meets the updated requirements. Rick’s can advise on compliance during a commercial service visit.
What drainage records does a Connecticut restaurant need to keep for grease trap maintenance?
Most Connecticut municipalities require records including the date of service, the contractor who performed the service, the volume of material removed, and disposal documentation. These may be requested during food service permit inspections. Rick’s provides service documentation for every grease trap service call.
Can Rick’s Plumbing service restaurant grease traps in New Haven County?
Yes. Rick’s Plumbing provides commercial drain cleaning and grease trap assessment for food service establishments in New Haven and Fairfield Counties, including restaurants, cafeterias, institutional kitchens, and food processing facilities.
What is the difference between a grease trap and a grease interceptor?
The terms are often used interchangeably but can refer to different sizes. A grease trap typically refers to smaller under-sink units of 25 to 100 gallons. A grease interceptor typically refers to larger underground units of 500 gallons or more. Both work on the same principle of passive FOG separation but differ in capacity, location, and cleaning method.
What are signs a commercial kitchen’s drain lines have FOG buildup beyond the trap?
Signs include slow draining across multiple kitchen fixtures simultaneously, foul odors from drains even after the trap has been recently cleaned, and visible grease deposits in accessible drain sections. Professional hydrojetting clears FOG buildup from drain line walls that trap cleaning alone does not address.
Can hydrojetting clear a kitchen drain line that has FOG buildup?
Yes. Hydrojetting uses high-pressure water to scour the full interior circumference of the pipe, removing adhered FOG that standard mechanical snaking leaves on the walls. Rick’s uses hydrojetting for commercial kitchen drain lines where FOG accumulation has reduced pipe capacity.
Does Rick’s Plumbing perform sewer camera inspection for commercial drain lines?
Yes. Rick’s performs sewer camera inspection for commercial properties to confirm the condition of drain lines downstream of the grease trap, identify any FOG accumulation points, and verify the line is fully clear after hydrojetting.
Who is responsible for grease trap maintenance in a leased commercial restaurant space?
This depends on the specific lease agreement between the tenant and the property owner. Most commercial leases place responsibility for grease trap maintenance on the tenant operating the food service business, since the tenant controls the kitchen operations that produce FOG. Rick’s advises tenants and property owners to confirm responsibility in writing before a service issue arises.
How do I schedule grease trap service for my Connecticut restaurant with Rick’s Plumbing?
Call Rick’s Plumbing at 203-874-6629 or visit ricks plumbing to schedule commercial grease trap assessment and drain service. Our team will confirm your appointment and dispatch a licensed commercial plumbing technician to evaluate the system and perform the appropriate service.
Schedule Your Commercial Grease Trap Service Today
For Connecticut restaurants and food service establishments across New Haven and Fairfield Counties, Rick’s Plumbing Service, Inc. provides expert commercial drain cleaning, grease trap assessment, and hydrojetting that keeps drain lines clear and helps maintain compliance with local WPCA requirements. Our team has been licensed, insured, and trusted since 1992. Call 203-874-6629 today, and read what your clients say on Google before scheduling. For background on FOG management in wastewater systems, the EPA wastewater resource provides additional context.