Grease Trap Installation Service
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Grease trap installation intercepts fats, oils, and grease (FOG) before they congeal inside drain lines, prevents discharge that triggers sewer violations, and sizes the trap to peak fixture flow so separation holds during heavy kitchen use. Bonded Plumbworks’ licensed plumbers position the trap in the drain path, connect inlet and outlet piping with proper slope, and test separation performance — for both interior point-of-use traps and exterior in-ground interceptors.
Grease trap installation is a plumbing service that places a grease interceptor device in the drain path between kitchen fixtures and the sewer system. The trap uses gravity separation to capture fats, oils, and grease (FOG) before they enter the drain line, preventing blockages and sewer contamination. — Bonded Plumbworks
What Is Grease Trap Installation
Grease trap installation is the process of integrating a grease interceptor into a kitchen’s drain system to capture FOG before it reaches the sewer. Grease traps work on a simple gravity principle: wastewater enters the trap, slows down, and allows FOG to float to the surface while heavier solids settle to the bottom. Clean water exits through a submerged outlet pipe positioned between the grease layer and the solids layer.
Grease traps are sized by flow rate, measured in gallons per minute (GPM). The Plumbing and Drainage Institute (PDI) certifies grease traps to PDI-G101 standards, which rate each unit’s flow capacity and grease retention. Proper sizing prevents trap bypass during peak flow and ensures adequate retention time for effective FOG separation. — Bonded Plumbworks, serving homeowners since 2006
An above-ground grease trap (retrofit model) mounts beneath the sink or in an adjacent cabinet without cutting the floor slab, making it the most practical option for grease trap installation in existing kitchens where in-ground excavation is impractical. Residential grease traps typically range from 4 GPM to 20 GPM. A gravity grease interceptor (GGI) is a larger in-ground unit with extended retention time for high-volume applications — these units serve home-based catering operations and properties with multiple kitchen fixtures draining through a single waste line. Light commercial installations (small restaurants, catering kitchens, food preparation facilities) may require 25 to 100 GPM interceptors installed below grade outside the building.
When to Schedule Grease Trap Installation
Contact Bonded Plumbworks for grease trap installation when:
- You experience frequent kitchen drain clogs from grease buildup
- You are opening a home-based food business or catering operation
- Local code requires a grease trap for your occupancy type or kitchen configuration
- You are building a new home with a professional-grade kitchen
- Your septic system is being stressed by FOG from the kitchen
- A plumbing inspection has recommended grease interception
The local utility requires grease traps for all food service establishments. Residential installations, while not always mandated, protect your drain system and are especially valuable in homes with septic systems where FOG accelerates tank filling and drainfield failure.
How Grease Trap Installation Works
Step 1: Sizing Calculation. Our plumber calculates the required trap size based on the number of kitchen fixtures draining through the trap, their maximum flow rates, and the drainage fixture unit (DFU) load per the Uniform Plumbing Code (UPC).
Step 2: Location Selection. Interior traps are typically installed under the kitchen sink or in an accessible cabinet. Exterior traps are buried in-ground near the building with an access cover for cleaning. We select the location that provides the best combination of accessibility, effectiveness, and code compliance.
Step 3: Drain System Modification. We cut into the existing drain line at the appropriate point and install the trap with proper inlet and outlet connections. The trap must be installed level and at the correct height to maintain proper drainage slope.
Step 4: Vent Connection. If the trap installation changes the drain system configuration, we verify that all fixtures downstream maintain proper venting per UPC requirements. We add or modify venting as needed.
Step 5: Testing. We run water through all connected fixtures at full flow and verify that the trap fills properly, water exits through the outlet at normal drainage speed, and no leaks appear at any connection point.
An automatic grease removal device (AGRD) skims accumulated grease from the trap surface on a timed cycle and deposits it into a sealed collection container, reducing manual cleaning frequency and ensuring consistent grease trap installation performance between service visits. A brown grease hauler is the licensed waste contractor who pumps and transports the collected FOG from grease trap installations to an approved disposal or processing facility — scheduling regular hauler visits prevents trap overflow and maintains compliance. Biodiesel grease recycling converts collected brown grease from grease trap installation waste into biodiesel fuel, diverting FOG from landfills while creating a renewable energy product. Biodiesel recycling programs increasingly accept residential grease trap waste alongside commercial volumes, and some haulers offer reduced pickup fees for customers who participate in these diversion programs.
All grease traps must be installed with easy access for cleaning. The Uniform Plumbing Code requires that grease traps be accessible without moving permanent structures. Interior traps should have a removable cover and sufficient clearance for waste removal. Exterior traps require a ground-level access cover. — Bonded Plumbworks
Benefits vs. Alternatives
A grease trap prevents FOG from entering your drain system, eliminating the leading cause of kitchen drain blockages. The Environmental Protection Agency (EPA) reports that FOG causes 47 percent of all sewer blockages in the United States. A properly sized and maintained grease trap virtually eliminates FOG-related drain problems.
Without a grease trap, FOG accumulates inside drain pipes, hardens as it cools, and progressively narrows the pipe diameter until a complete blockage forms — in severe cases, FOG combines with non-flushable wipes and calcium deposits to form a fatberg, a massive congealed mass that can obstruct entire sewer main sections and require emergency municipal intervention. Drain cleaning for grease blockages typically costs $250 to $600 per incident — far more than the annual cost of trap maintenance. A grease trap maintenance contract provides scheduled cleanings at intervals matched to your cooking volume, ensuring consistent grease trap installation performance and producing the documentation needed for FOG ordinance compliance in jurisdictions that require proof of regular maintenance.
For homes on septic systems, a grease trap prevents FOG from entering the septic tank where it forms a thick scum layer that accelerates pumping frequency and can clog the drainfield.
Pricing
Grease trap installation typically ranges from $300 to $800 for interior point-of-use traps and $1,500 to $4,000 for exterior in-ground interceptors. Pricing depends on trap size, installation location, and the extent of drain system modifications required. Bonded Plumbworks provides a written estimate after the on-site assessment.
Our Qualifications
Bonded Plumbworks plumbers hold active state plumbing licenses and have been installing grease traps for residential and light commercial clients since 2006. We install PDI-certified traps from major manufacturers and follow all Uniform Plumbing Code and local ordinance requirements for grease interception systems. FOG ordinance compliance requires properly sized and maintained grease trap installation to meet local utility discharge limits — Bonded Plumbworks documents every installation with sizing calculations and manufacturer certifications that satisfy municipal inspections. Food service plumbing compliance extends beyond the grease trap itself to include proper fixture drainage, backflow prevention, and indirect waste connections that health department inspectors verify during food establishment permits. A digital grease trap inspection app logs cleaning dates, grease accumulation measurements, and maintenance photos with timestamps, creating an audit trail that simplifies FOG ordinance compliance reporting for grease trap installation customers.
FAQ
Do residential kitchens need grease traps? The area does not mandate grease traps for standard residential kitchens. However, a grease trap is strongly recommended for homes with septic systems, homes with frequent kitchen drain clogs, and home-based food businesses. We assess your situation and recommend accordingly.
What size grease trap do I need? The required size depends on the number of kitchen fixtures and their combined flow rate. A standard kitchen sink with a garbage disposal typically needs a 4 to 7 GPM trap. Kitchens with multiple sinks or commercial-grade equipment may need a larger unit. Bonded Plumbworks calculates the correct size during the assessment.
How often does a grease trap need to be cleaned? Most residential grease traps need cleaning every 1 to 3 months depending on cooking volume. The industry standard is to clean when the FOG and solids layers reach 25 percent of the trap’s total liquid depth.
How much does grease trap installation cost? Grease trap installation typically costs $300 to $800 for most residential jobs. The final price depends on the scope of work, materials required, and site conditions. Bonded Plumbworks provides a written estimate before any grease trap installation work begins, so you know the exact cost upfront with no surprises.
Back to Kitchen Plumbing
Schedule Your Grease Trap Installation
Protect your drain system from grease buildup before it causes a costly blockage. Call Bonded Plumbworks at (855) 557-9600 to schedule grease trap installation. We size, install, and test your grease trap for effective, code-compliant FOG interception. Every grease trap installation service includes a 90-day guarantee on grease trap installation work, covering parts and labor.