Restaurant Lateral Line Jetting in Phoenix

In a kitchen, we call the branch pipes that run from a group of fixtures to the building drain the laterals. They are the 2 to 4 inch lines under the slab or in the wall behind the cook line. The code has its own words for these pieces, but the job is the same: they carry warm, greasy, starchy water from the fixtures to the main, and they cool and coat as they go.

They clog before the main for a simple reason. They are smaller, they sit closest to the grease sources, and the water in them has not been diluted by the rest of the building. A branch that serves a dish machine and two pot sinks sees more grease per gallon than anything downstream of it.

We jet laterals from the inside, through an access point your kitchen already has. That is usually a floor sink receptor, a cleanout, or a fixture trap pulled off. The 2024 plumbing code treats a removable trap as a cleanout equivalent, and it says a cleanout should let you clean only in the direction of flow. So we start above the clog and work downstream.

The tool is a small-bore hose with a nozzle that throws jets backward. The jets pull the hose forward and scour the pipe wall as the hose retracts. A cable cannot do that. It drills a hole through the grease and leaves the coating on the wall, which is why a cable-cleared lateral often backs up again within weeks.

Safety is part of the method. Manufacturers warn that a jetter hose can whip if its end leaves the drain, so the hose goes in before the pump comes up and the nozzle stays in the pipe. We protect the floor and keep the water going down the line instead of across the tile.

When the pass is done we flush the line and run your fixtures to confirm. If the run is long or has had trouble before, we put a camera through it to see the wall and look for sags. Our sewer camera inspection service covers what that shows.

Loosened grease has to go somewhere, and the pipe it goes into is the main. If we jet only the laterals, we push the debris into a main that is already coated, and it can stop right at the first bend. So we clear laterals first and follow with a pass on the main, which has its own page: restaurant main line jetting.

There is a second place the debris goes: your grease interceptor. Phoenix wants hydromechanical units pumped every 30 days and gravity units at least every 3 months, so timing a lateral jetting visit shortly before a scheduled pump-out lets the hauler remove what we loosened. We do not pump, and we do not need to. A licensed hauler does that, and we can coordinate the timing with them.

A cable is enough when a single object or a short plug sits near the fixture. A jet is the right call when the problem is coating, when the same fixture clogs again within weeks, or when several fixtures on one branch slow down together. If you are not sure, a quick cable pass first costs little time, and what the cable pulls out tells us whether to jet.

• The lateral has a belly or a break. The code requires a minimum of 1/4 inch per foot on pipes that feed an interceptor in Phoenix. If a camera shows standing water that jetting cannot move, the pipe has settled or broken, and the fix is a repair. See sewer repair.
• There is no way in. A lateral with no cleanout and no removable trap needs access first. Required cleanouts cannot be hidden, so a missing one is a code gap as well as a nuisance.
• One fixture is slow and the rest are fine. That is a kitchen drain cleaning job, not a lateral job.
• The slow drains all start at the main. Then the main is the target.

Tell us the fixtures on the slow branch, how often it recurs, and when your interceptor was last pumped. We schedule interior work before opening or after close, usually one to two hours inside. We give you an upfront price before work starts, and estimates are free. Related: hydro jetting, commercial drain cleaning, and restaurant plumbing.