6 Common Causes of Noisy Pipes

Let’s cut through the racket and look at the causes of noisy pipes.

Ever filled up the kitchen sink with water, only to hear a cacophony of clangs and clatters coming from inside the walls? The quickest way to restore calm to your home is to understand just what causes noisy water pipes to happen, and work through them methodically.

There are many potential causes of noisy pipes, from water hammer to gurgling noises in drain pipes. And if you think that noisy water pipes are “just a nuisance” and not really something worth worrying about, think again.

Let’s take a look at six of the most common reasons behind your noisy pipes and what you can do to resolve the problem.

Cause 1: Excessive Water Pressure and Water Hammer

High water pressure and fast valve closures create the perfect storm for water hammer.

Water hammer is that loud banging sound or knocking noise that makes copper pipes jump. It happens when plumbing fixtures that shut off quickly, such as mixer taps, dishwashers and washing machines, force a sudden stop to water moving through the lines.

To stop hammering noises in their tracks, start by measuring your house water pressure. If it’s too high, fit a pressure limiting valve (PLV) to bring it back within Australian limits (maximum 500 kPa as per the Victorian Building Authority). Installing water hammer arrestors close to quick-closing fixtures absorbs the shock wave when the sudden rush of water flow stops.

It’s also worth checking that the main shut-off valve is fully open and functional, as a half-closed or faulty main shut-off valve can increase vibration. If in doubt, have a professional plumber size and position arrestors and set the regulator correctly for your home’s plumbing system.

Cause 2: Loose Pipes, Clips and Fittings Vibrating

Loose supply pipes are among the most common causes of noisy pipes in homes. When they rub on framing or fixtures, you get all sorts of rattling, humming and vibrating sounds. Try these fixes:

• Secure pipes with compliant saddles and clips to stop vibrating sounds.
• Add insulation or padding where pipes touch framing or masonry.
• Prioritise bends, tees and long runs on the incoming cold water line.
• Re-clip hot lines where expansion in copper pipes is greatest.
• Check around the pressure reducer/regulator manifold for loose fittings.
• Support the pipework near the hot water system and washing machines.
• Fit grommets where pipes pass through floor joists and ceiling boards.

If access is tight and the pipework is concealed, call a licensed professional plumber to re-clip and cushion runs so the noise doesn’t return. If you do anything that actually alters the pipework, by law, you will need a licensed plumber to do the job as well.

Cause 3: Worn Out Washers, Valves and Tapware Components

A worn-out washer, mineral deposits or a tired cartridge in the mixer tap can create a whistling sound or even a squealing sound as water rushes past a restriction. These common causes of noisy pipes often show up at a single tap or toilet.

To fix the issue, replace damaged washers in your tapware or have a plumber replace any tired mixer tap cartridges. Cleaning out the aerators will also help to restore smooth water flow.

In toilet cisterns, a worn-out ballcock assembly or fill valve can howl; replacing that will often fix whistling water pipes. If a shut-off valve or main water supply valve is sticking, it may need replacement rather than a tweak.

No matter what you do, be sure to comply with local regulations and get a licensed professional plumber to handle any valve work on fixed piping. The Queensland Building and Construction Commission offers a comprehensive list of unregulated plumbing work that any DIY-er can legally carry out. Anything not in this list needs a licensed plumber.

Cause 4: Air Pockets, Air Bubbles and Ineffective Air Chambers

Air pockets trapped in water supply pipes can trigger knocking and vibrating noises after maintenance or a sudden pressure change.

To treat this cause of unwanted water pipe noises, first purge the air. Close the main shut, open all the taps from the top floor to the bottom, then reopen the main and let the water rushing stabilise before closing the taps. Older air chambers lose effectiveness over time; have your plumber install mechanical arrestors as per Australian Standard AS 3500: 2021 and ensure they size them to fixture units.

Modern practice in Australia is to fit water hammer arrestors instead of relying on air chambers alone. If air intrusion recurs, a professional plumber can check for back-siphonage issues, fit arrestors near quick-closing fixtures and confirm the pressure regulator is set correctly.

Cause 5: Hot Water Expansion and Water Heater Issues

When hot water flows through copper pipes, thermal expansion can make clicking or tapping sounds as pipes rub on framing. Scale inside a water heater can cause rumbling, while a compromised relief line can intensify water hammering.

To reduce these causes of noisy pipes, get a licensed plumber to:

• Insulate hot lines at contact points.
• Ensure clearances at penetrations.
• Secure loose piping.

It’s also well worth flushing the hot water system to clear out mineral deposits that restrict water flow.

In Australia, any work on temperature and pressure relief valves or connections must comply with AS/NZS 3500: 2025, so always get a professional plumber on board.

Cause 6: Noisy Drain Pipes and Venting Problems

If you hear a gurgling noise after your plumbing fixtures drain, the issue usually sits in the sanitary system rather than the pressurised lines.

Typical causes of noisy pipes on the drain side include:

• Partial blockages.
• Long flat runs.
• Undersized vents that pull traps dry.

Signs include slow drainage, bubbling, or strange noises from adjacent basins when another fixture discharges. A CCTV inspection locates build-ups and confirms vent integrity. Clearing obstructions, correcting grades and ensuring proper trap and vent sizing per AS/NZS 3500 will quieten drain pipes. Good insulation on stack penetrations also helps.

Now we’ve said this already, but let me make it clear: leave any pipework alterations to a licensed professional plumber to keep everything safe and compliant.

Why You Shouldn’t Ignore Noisy Pipes

If you’ve dismissed noisy water pipes as nothing more than “just a nuisance”, it’s worth knowing the consequences of leaving them unresolved.

Persistent water hammer or vibration puts constant stress on joints, fittings and appliances, increasing the risk of burst pipes, hidden leaks and costly water damage. Excessive pressure can shorten the lifespan of tapware, valves and hot water systems, and may even compromise safety features such as temperature relief valves.

Over time, undetected leaks can also inflate water bills and promote mould growth. Acting early protects your home’s plumbing system, safeguards compliance and saves you from expensive emergency repairs later.

Bring Pipe Noise Back to Civilised Levels

Let’s keep this simple. Start with the easy wins: check your water pressure, then tame it with a regulator if it’s high. Add water hammer arrestors near quick-closing taps and appliances, and secure any rattly pipe runs you can see. Service worn tapware so water flows smoothly, and keep the main shut-off fully open. Don’t forget the drain side and a bit of hot water system maintenance. If a fix touches fixed pipework, get a licensed plumber so everything complies with Australian standards. Check with your local state as to whether that is AS/NZS 3500: 2021 version or the new 2025 update.

Tackle the causes of noisy pipes one by one and you’ll swap banging and whistling for a plumbing system that’s quiet, efficient and drama-free.

Please note: Thanks for reading our blog “6 Common Causes Of Noisy Pipes”. This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.