Commercial restroom plumbing repair in northern Utah

Commercial restroom plumbing covers every fixture in a public or staff restroom and the pipes behind it. That includes:

• Toilets and urinals. Most use a flush valve (a flushometer) on the wall pipe instead of a tank. Some small restrooms have tank toilets like the ones in a house.
• Faucets. Manual, push-down, and sensor faucets, and the mixing valve that limits how hot the hand-washing water gets.
• Sinks. Wall-hung and counter sinks, their drains, and their traps.
• Floor drains. The drain in the floor and the trap under it.
• Supply and drain lines. The shut-off valves, the water pipes in the wall, and the drain and vent piping.

The backflow assembly on the building's water service is a separate job with its own rule. Utah Administrative Code R309-105-12 says backflow assemblies shall be inspected and tested at least once a year by a certified individual (source). Our backflow testing page explains the test. For a repair or a set of new fixtures, ask for a commercial quote.

A flush valve that keeps running has a worn part or debris inside it. A flush valve (flushometer) has no tank. It uses the pressure in the supply pipe, and a rubber diaphragm or a piston inside meters each flush. The common causes:

• Runs and will not stop. The small bypass hole in the diaphragm or piston is plugged with grit or scale, or the rubber is torn.
• Short or weak flush. The diaphragm is worn, the control stop is partly closed, or the supply pressure is low.
• No flush at all. The control stop is closed, the handle parts are worn, or a sensor valve has dead batteries or a failed solenoid.

The usual fix is a rebuild with new parts matched to the fixture, or a new valve. Hard water leaves scale on these parts. Salt Lake City's 2026 Water Quality Report lists total hardness of 8.0 to 12.4 grains per gallon at its three treatment plants (source). Pressure varies too. Saratoga Springs says water pressure in the city can vary from 40 to 150 psi (source).

A restroom floor drain smells when its trap has dried out, and it backs up when the line past it is clogged. The trap is a U-shaped bend under the drain that holds water. That water blocks sewer gas. A floor drain that rarely gets water loses its seal to evaporation, and the smell comes up through the dry trap. A gallon of water poured into the drain refills it. If the smell keeps coming back, the trap primer, a small valve that feeds the trap, may have failed, or the trap may be cracked.

A backup is a different problem. The floor drain is the lowest opening in the room, so it shows a clogged line first, often when toilets flush. If sewage comes up, keep people away from it and stop running water in that restroom. Paper towels, wipes, and grit from mop water are usual causes. Drain cleaning clears the line, and a camera shows why it clogged.

The ADA Standards set heights and clearances for the fixtures in an accessible restroom. Chapter 6 of the standards, published by the U.S. Access Board, includes these (source):

• Toilet seat. 17 inches minimum and 19 inches maximum above the floor, measured to the top of the seat.
• Flush control. Hand operated or automatic, on the open side of the toilet.
• Urinal. Rim 17 inches maximum above the floor.
• Sink. The higher of the rim or the counter, 34 inches maximum above the floor, with knee and toe clearance below.
• Pipes under the sink. Supply and drain pipes insulated or otherwise configured to protect against contact.

The standards have exceptions, and they are not the only rule. Which fixtures in your restroom must meet them is a decision for the building owner's designer or the local code official. The plumbing itself is installed under the 2024 International Plumbing Code, which Utah adopted with state amendments in Utah Code 15A-2-103, in the version in effect July 1, 2026 (source).

How a restroom repair is scheduled depends on the hours your building is open and how much of the restroom has to close. Tell us the hours we can work without getting in your customers' way, and who will let us in.

How much closes depends on the repair:

• One fixture. A flush valve has a control stop, and a faucet has shut-off valves under the sink. Closing them lets one fixture be repaired while the others stay in use.
• A group of fixtures. If a stop will not close, or the leak is in the wall, the water to the whole restroom goes off for a time.
• The drain. Clearing a main drain line means no flushing in that restroom until the line is open.

When you call, tell us how many restrooms the building has, which fixture is down, and whether it is a public or a staff restroom. A toilet or urinal that will not stop running can be shut off at its control stop until the repair. A person answers the emergency line 24/7.

Repair an old restroom fixture when the china and the valve body are sound. Replace it when it is cracked or corroded, or when it uses far more water than a current fixture. A flush valve can be rebuilt many times. A cracked bowl or a corroded valve body cannot.

Water use is the other reason. The EPA's WaterSense program says about 7 million flush-valve toilets in the United States have flush volumes as high as 3.0 to 7.0 gallons per flush. The federal standard is 1.6, and labeled models use no more than 1.28 (source). For urinals, the federal standard is 1.0 gallon per flush, and labeled models use no more than 0.5 (source).

The valve and the fixture have to match. A low-flow valve on a bowl made for a bigger flush clogs more, so the two are often replaced together. Scale counts too. Provo's 2025 Water Report lists typical hardness of 10–15 grains per gallon (source), and scale builds up in aerators, sensor faucets, and flush valves.

We give free estimates and do not post prices. These are the things that change the cost of commercial restroom plumbing:

• Repair or replacement. New inside parts for a flush valve or a faucet are a smaller job than a new valve, faucet, or fixture.
• The kind of fixture. Sensor valves and faucets have more parts than manual ones. Wall-hung fixtures hang on a carrier inside the wall.
• How many fixtures. One urinal is a different job than every fixture in two restrooms.
• Access. Piping behind tile, or in a pipe chase with no access panel, takes longer to reach.
• The shut-off valves. Stops that no longer close have to be replaced before the repair.
• The drain. A clog near the fixture is simpler than one in the main line.
• The plans. New fixtures set to an accessible layout may mean moving pipes in the wall.

We tell you the cost before we start the work.