When a Restaurant Grease Interceptor Needs Replacing, Not Repairing

Some interceptor calls start as repairs and end as replacements. The tank has been patched before, the baffles keep failing, the walls are rotted above the waterline, or the kitchen has added equipment since the tank was sized. Another sign is a tank that is pumped on schedule and still lets grease through.

Decaying grease gives off hydrogen sulfide, which turns to acid on the concrete above the water. Over years that eats the tank from the inside. Light damage can be coated or patched. A tank that has rotted through cannot.

We start with the same visit as a repair. Your pumper empties the tank, and then we inspect every internal part, the walls, the lid and the pipes in and out. A camera on the line behind the tank shows whether the damage has already reached the pipe.

We are looking for a clear answer to one question: will a repair last? A broken baffle in a sound tank is a repair. Cracks, exposed rebar, a collapsed wall or a tank that was never big enough for the kitchen point to replacement. If the notes from the visit say more than one thing is failing, we say so plainly.

Replacement is a proposal, not an on-the-spot decision. The proposal lays out the work, and larger repairs on managed or chain sites wait for the property manager's or the account's approval before anything starts. Because installing or replacing an interceptor goes through plan review in Phoenix, the permit and review steps come first, and the city's own process sets the timing. Other Valley cities have their own rules, so we check the one your site is in.

While the old tank is out of service, the kitchen still has to drain. Plan the sequence with us ahead of time, including which days the kitchen can run reduced menus or stay closed.

Pull the pumper's records and any earlier repair notes. They show how long the problem has been building and help the city and your landlord see why replacement is justified. If you lease the space, find out whether the interceptor is the tenant's or the landlord's before you ask for a proposal, since approval usually runs through whoever owns the cost. Ask us for the proposal in writing. It comes with the price before work starts and with a free estimate visit.