If you own or manage a restaurant, a grease trap is not optional — it is a legal requirement in virtually every municipality in the United States. But how much does a grease trap actually cost? The answer depends on the type, size, installation method, and your local code requirements.
This comprehensive 2026 pricing guide breaks down every cost you need to budget for, from the unit itself to installation, permits, and ongoing maintenance. Whether you are opening a new restaurant or replacing an aging system, this page gives you the real numbers.
Grease Trap Cost Overview (2026)
Grease trap costs vary widely based on whether you need a small under-sink unit or a large in-ground interceptor. Here is a quick summary of what restaurant owners are paying in 2026:
| Grease Trap Type | Unit Cost | Installation Cost | Total Installed Cost |
|---|---|---|---|
| Small Under-Sink (20-50 GPM) | $250 – $1,500 | $150 – $500 | $400 – $2,000 |
| Large Indoor (50-100 GPM) | $1,500 – $4,000 | $500 – $2,000 | $2,000 – $6,000 |
| In-Ground Interceptor (500-2,000 GPM) | $3,000 – $8,000 | $5,000 – $15,000 | $8,000 – $23,000 |
| Automatic Grease Removal Device | $3,500 – $8,000 | $1,000 – $3,000 | $4,500 – $11,000 |
Factors That Affect Grease Trap Cost
1. Size and Flow Rate
Grease traps are rated by gallons per minute (GPM). A small coffee shop with a single prep sink might only need a 20 GPM unit costing a few hundred dollars. A full-service restaurant with multiple fryers, a wok station, and a three-compartment sink could require a 50-100 GPM trap or even an in-ground interceptor rated at 1,000 GPM or more. Larger units cost significantly more to purchase and install.
2. Material
Grease traps are manufactured from several materials, each with different price points and longevity:
| Material | Price Range | Durability | Best For |
|---|---|---|---|
| Plastic / Polyethylene | $250 – $1,500 | 5-10 years | Small indoor traps |
| Stainless Steel | $500 – $4,000 | 15-25 years | Indoor commercial kitchens |
| Precast Concrete | $2,000 – $8,000 | 25-40 years | In-ground interceptors |
| Fiberglass | $3,000 – $7,000 | 20-30 years | Large in-ground systems |
3. Installation Complexity
Under-sink traps can often be installed by a licensed plumber in a few hours for $150 to $500 in labor. In-ground interceptors require excavation, concrete work, plumbing connections, and inspections — driving labor costs to $5,000 to $15,000 or more. If your restaurant is in a dense urban area or an older building, expect costs on the higher end due to limited access and complex plumbing runs.
4. Permits and Inspections
Most cities require permits for grease trap installation. Permit fees typically range from $100 to $500, but some jurisdictions charge more for in-ground systems. You may also need to pay for plumbing inspections, which can add $100 to $300 to the total project cost.
5. Local Code Requirements
Your city or county plumbing code dictates the minimum size and type of grease trap your restaurant must install. Some municipalities require in-ground interceptors for all food service establishments regardless of size. Others allow under-sink traps for smaller operations. Always check with your local code enforcement office before purchasing any equipment.
Ongoing Costs: Maintenance, Cleaning, and Compliance
The purchase price is just the beginning. Grease traps require regular professional cleaning and maintenance to function properly and keep you in compliance with local regulations.
| Ongoing Cost | Frequency | Typical Cost |
|---|---|---|
| Professional Pump-Out (Small Trap) | Monthly to Quarterly | $125 – $300 per service |
| Professional Pump-Out (Large Interceptor) | Monthly to Quarterly | $300 – $800 per service |
| Grease Trap Additives / Enzymes | Monthly | $20 – $60 |
| Annual Inspection (if required) | Annually | $100 – $250 |
| Repairs (gaskets, baffles, fittings) | As needed | $50 – $500 |
Over a five-year period, a restaurant with a standard under-sink grease trap can expect to spend $3,000 to $8,000 on cleaning and maintenance. For in-ground interceptors, five-year maintenance costs often reach $10,000 to $20,000.
How to Save Money on Grease Trap Costs
Get multiple quotes. Installation prices vary significantly between plumbing contractors. Get at least three written estimates before committing.
Choose the right size upfront. An undersized trap will clog frequently, leading to more pump-outs and potential fines. Spending a little more on the correct size saves money long-term.
Negotiate a maintenance contract. Many pumping companies offer discounts for scheduled recurring service. A maintenance contract can save 10-20% compared to on-demand calls.
Train your staff. Proper scraping and dry-wiping of dishes before washing reduces the grease load on your trap, extending the time between cleanings.
Consider an automatic grease removal device (AGRD). While the upfront cost is higher, AGRDs can reduce pump-out frequency by 80% or more, potentially saving thousands per year on maintenance.
Frequently Asked Questions
How much does a grease trap cost for a small restaurant?
A small restaurant with limited frying can expect to pay $400 to $2,000 total for a standard under-sink grease trap, including installation. Ongoing cleaning costs will add $1,500 to $3,600 per year depending on pump-out frequency.
How much does an in-ground grease interceptor cost?
In-ground grease interceptors typically cost $8,000 to $23,000 fully installed. The wide range depends on the tank size, material, excavation requirements, and local permit fees.
Can I install a grease trap myself?
While small under-sink traps are relatively simple to connect, most municipalities require installation by a licensed plumber and a plumbing permit. DIY installation may void warranties and create code compliance issues. Professional installation is strongly recommended.
How often does a grease trap need to be pumped?
Most grease traps need professional pump-out service every 1 to 3 months. The exact frequency depends on the trap size, your restaurant volume, and local regulations. Many cities enforce the 25% rule — the trap must be cleaned when grease and solids reach 25% of the total capacity.
What happens if I do not have a grease trap?
Operating without a required grease trap can result in fines ranging from $500 to $10,000 or more per violation, depending on your municipality. Repeated violations can lead to business closure orders. Grease discharged into the sewer system can also make you liable for sewer line repair costs.
Are grease traps tax deductible for restaurants?
Yes. Grease trap purchase and installation costs are generally deductible as a business expense. Small units may be fully deductible in the year of purchase under Section 179. Larger in-ground systems may need to be depreciated over their useful life. Consult your accountant for specifics.