Planning a Grease Interceptor for a Houston Restaurant
Every commercial kitchen sends fats, oils and grease down its drains. Without a way to capture them, that grease cools, hardens and builds up in pipes and public sewers, causing backups and overflows. That's why restaurants, coffee shops with food service, bakeries, food trucks with commissaries and many other food businesses need a grease trap or grease interceptor.
The interceptor is easy to overlook during a buildout because it is underground or under a sink, but it often drives a big piece of the plumbing and site work. This guide explains what owners, tenants and landlords should plan.
This page is general information, not legal, design or engineering advice. Requirements depend on your plumbing code, local utility rules and the specific kitchen, so work with your architect, plumbing engineer and attorney.
Grease trap vs grease interceptor
People use the terms loosely, but there is a general difference:
- Grease traps are smaller units, often installed inside near a sink or under the floor. They need frequent cleaning.
- Grease interceptors are larger tanks, usually installed outside below grade, that serve the whole kitchen. They hold more and are pumped by a service company.
Which type you need depends on the kitchen's menu, fixtures, volume and the local rules that apply. Many full-service restaurants need an outdoor interceptor.
Why it matters to the whole project
The interceptor affects:
- Kitchen plumbing layout: Which fixtures drain to the interceptor and which go straight to the sanitary sewer
- Slab work: Grease lines often need trenching across the slab to reach an outdoor tank
- Site work: An outdoor tank needs excavation, a location with truck access, and repair of paving and landscaping
- Schedule: Large precast tanks may need to be ordered and delivered
- Lease and landlord approvals: The interceptor may sit in common areas or parking
Getting it wrong can mean cutting a new slab after the floors are finished, or relocating a tank after the parking lot is repaved.
Is there already one on site?
In second-generation restaurant space, there may already be an interceptor. Check:
- Is it the right size for your kitchen?
- Is it in good condition, or cracked, corroded or leaking?
- Is it shared with other tenants?
- Are the lids and access points safe and reachable?
- Are maintenance records available?
A camera inspection of the grease line and a pump-out with inspection can reveal its condition. Our guide to what to reuse in second-generation space covers evaluating existing improvements.
Sizing and fixture connections
Sizing is usually set by the plumbing code and the utility's rules, based on the kitchen's fixtures and flow. Typical fixtures connected to grease waste include:
- Three-compartment sinks
- Prep sinks
- Mop sinks
- Floor drains in the kitchen
- Dishwashers, depending on local rules
Some fixtures, such as restroom fixtures, should not drain to the interceptor. The design team should coordinate the menu, equipment and fixture plan before sizing.
Location and access
Choose the location carefully:
- Truck access for pumping
- Distance from the kitchen, since longer runs mean more slope and depth
- Load rating if the tank sits under parking or a drive
- Away from building entrances where odors would bother guests
- Clear of utilities and existing underground lines
Plan for lids that can be opened safely for inspection and pumping. Parking lot repairs around a new tank are often part of the scope. Our guide to commercial parking lot repair options covers paving repairs.
City requirements and maintenance
Inside the city, Houston Public Works administers wastewater service and the rules for grease-producing businesses, including permits, pumping and recordkeeping. The Texas Commission on Environmental Quality oversees broader water quality rules and the transporters that haul grease waste. Suburban cities and utility districts have their own requirements.
Expect to:
- Register or obtain any required permit for the interceptor
- Have it pumped by a qualified hauler on the required schedule
- Keep pumping manifests and maintenance records
- Allow inspections
Requirements carry legal consequences, so confirm your obligations with the utility and your attorney.
Coordinate with other kitchen systems
The interceptor is one part of the kitchen's infrastructure. It should be planned alongside:
- Hood and grease duct exhaust. See our guide to commercial kitchen hood and grease duct upgrades.
- Water service and backflow. See our guide to backflow and water service upgrades.
- Gas and electrical service for cooking equipment
- Floor drains and floor sinks in the kitchen
Our restaurant buildout checklist explains how these fit together in a full kitchen project.
Permits and inspections
Plumbing and site work for a grease interceptor usually require permits and inspections through the Houston Permitting Center inside the city. The health department reviews food service establishments separately. Our guide to the buildout permit process in Houston explains the general sequence.
Lease questions for tenants and landlords
- Who pays for a new or upgraded interceptor?
- Is the interceptor shared, and how are costs split?
- Who handles pumping and keeps records?
- Who is responsible for sewer backups caused by grease?
- What happens to the interceptor when the tenant leaves?
- Does the landlord need to approve its location?
Leases are legal documents, so review them with your attorney. Our guide to landlord work vs tenant work letters explains how buildout responsibilities are usually divided.
Tips for landlords
- Plan centers and pad sites with grease lines and interceptor locations for future restaurants.
- Keep records of existing interceptors and their condition.
- Make pumping and record requirements part of the lease.
Tips for operators
- Confirm grease requirements before you sign a lease.
- Train staff to scrape plates and keep grease out of drains.
- Schedule pumping before it becomes urgent.
- Keep records where an inspector can see them.
Common mistakes to avoid
- Assuming an existing interceptor is adequate without inspection
- Locating the tank where trucks can't reach it
- Connecting the wrong fixtures
- Forgetting parking lot repair in the budget
- Skipping maintenance, which leads to backups and odors
Quick checklist
- Trap or interceptor type identified
- Existing unit inspected, if any
- Fixtures and sizing coordinated with the design team
- Location planned for access and load
- City and utility requirements confirmed
- Kitchen exhaust, water and gas coordinated
- Permits and inspections planned
- Lease responsibilities reviewed with your attorney
Grease interceptors are one of the least glamorous parts of a restaurant buildout, but planning them early prevents slab rework, sewer backups and opening delays.
Planning a restaurant buildout or grease interceptor in Houston? BPC Development LLC provides free on-site estimates in Houston, TX. Call (281) 301-4737.