Water Pressure / PRV Service in Dunwoody, GA

A bang when the washer stops filling, a shudder in the wall after a faucet snaps shut, a whistle while a toilet refills: noisy pipes are one of the most common reasons Dunwoody homeowners start wondering about their water pressure. Not every sound comes from pressure, but high pressure makes nearly all of them louder.

Matching the sound to the cause

• A sharp bang when a valve closes. Water hammer: a column of moving water stops suddenly and the shock runs through the pipe.
• A rattle or knock while water runs. Pipes moving against framing, or loose straps.
• A whistle or squeal at one fixture. A worn washer, cartridge or fill valve, often aggravated by high pressure.
• A hum or buzz from the regulator itself. Some pressure-reducing valves chatter when their internals wear or when the valve is badly matched to the flow.
• Ticking as hot water runs. Pipes expanding as they warm up, which has nothing to do with pressure.

A whistle confined to one tap usually points to faucet and valve repair, and a knocking pipe that has started to weep at a joint calls for leak detection and repair.

Why pressure makes hammer worse

The force of water hammer grows with the speed and pressure of the water being stopped. Quick-closing valves on dishwashers, washing machines, ice makers and single-lever faucets are the usual triggers. When household pressure runs high, every closure sends a harder jolt through the system, stressing joints and connectors as well as making noise. Bringing pressure down to a moderate setting is often the first and most effective step.

Confirming with a gauge

A reading from a hose-thread gauge on a laundry faucet, taken with everything off, shows whether pressure is part of the problem. A gauge with a max-reading needle can even record the spike from a single hammer event. If the reading is high, the regulator is the next stop: adjusted if it still responds, rebuilt or replaced if pressure creeps back after adjustment.

Water hammer arrestors and other fixes

Once pressure sits in a sensible range, any remaining hammer can be handled where it starts. A water hammer arrestor, a small device with a sealed air cushion or piston, fitted close to the quick-closing valve, absorbs the shock; some washing machine outlet boxes come with a pair built in. Loose pipes are secured with proper straps or cushioned clamps wherever they can be reached. Older air chambers, which are simply capped stubs of pipe, can fill with water over time and stop doing anything.

When the noise comes from the regulator

A regulator that buzzes, hums or chatters is telling you its internals are worn or that it is struggling with the flow it sees. Debris on the seat and a tired diaphragm are frequent causes. Rebuilding a model that takes parts, or replacing it, usually quiets things down. While the water is off, the expansion tank beside the heater is checked as well, since a waterlogged tank lets pressure surge after heating cycles and can add to the racket.

Dunwoody's trade component permit

Dunwoody covers a stand-alone plumbing repair with a single trade component permit, which can be issued over the counter, and work should not start until the city has issued it. According to the city's permit FAQs, permits go to contractors who hold a license or to an owner who lives in the home.

Questions about noisy pipes in Dunwoody

Is water hammer harmful to my plumbing?

Occasional mild hammer is mostly a nuisance, but repeated hard shocks stress joints, fittings, supply hoses and appliance valves over time. Combined with high pressure, that stress can contribute to leaks. Checking the pressure and adding arrestors where the noise starts are sensible steps, rather than waiting for a fitting to fail.

Why did my pipes start banging after a new appliance was installed?

Newer washers and dishwashers often use solenoid valves that close very quickly, which creates hammer where the old appliance did not. If house pressure is on the high side, the effect is stronger. A gauge reading and an arrestor at the appliance connection usually solve it.

Do water hammer arrestors wear out?

Sealed piston-type arrestors are made to last, but they can fail, and banging that returns near one that used to keep things quiet is a hint. Older air chambers made from capped pipe lose their air cushion as they fill with water. Either way, check the house pressure before replacing an arrestor, since high pressure makes any hammer worse.

Quiet the pipes

Pipes that bang, hum or whistle in a Dunwoody house are worth a call to Alpha Plumbing and Sewer at (404) 409-4448. Tell us when the noise happens and where it sounds loudest.