Updated: 5/21/2025
These Plumbing Problems Aren’t Ghouls — But They Do Go Bump in the Night
Anyone who has ever been taking a shower or brushing their teeth before bed and has heard something go bump in the walls knows how scary these strange sounds can be, especially around Halloween. There’s nothing like a mysterious sound coming from who-knows-where to get the heart pumping and the hairs standing on end. Luckily, these sounds don’t (usually) mean that the house is haunted. Instead, they’re an indication of something much more sinister: a plumbing system issue. But when homeowners know what the sounds mean, they can be better prepared to deal with them in the best manner possible.
A Haunting Humming or Buzzing Sound
A humming or buzzing sound is often a cause for concern, especially if it continues long after it is first noticed. The good news is that a humming or buzzing sound isn’t usually caused by something super serious.
The humming sound is usually caused by the pipes vibrating behind the walls. And while this isn’t necessarily going to damage anything right away, it’s still pretty annoying. The vibration is typically caused by the home’s water pressure being a little too high. If the humming persists, it’s best to call a plumber to take a look at the water pressure, lowering it to between 40 and 60 psi if necessary. If the humming is coming from the toilet, it could mean a faulty or worn-down fill valve that needs to be replaced.
Screaming Pipes or the Wind Outside?
Some plumbing issues sound like there’s a ghost screaming in the walls. Some homeowners describe this as a whistling sound rather than a scream, but the result is still the same. It still causes chills and doesn’t mean anything good, that’s for sure. When the screaming or whistling noise sounds like it’s coming from a fixture, it’s likely due to a worn-down washer or some other piece of internal plumbing hardware that needs to be replaced.
However, a whistling sound can also be caused by high water pressure or a faulty pressure regulator valve. If the sound is coming from behind the walls, it could be because minerals have built up in the pipes and the sound of water rushing through the constricted piping causes the sound. If this is the case, there may need to be some repiping done by a professional plumber.
Water Hammer Can Give a Fright
What homeowners often describe as the scariest sound coming from behind the walls is the banging sound of a water hammer. This loud thud or clunk usually happens when a valve shuts off quickly—like when your dishwasher or washing machine finishes filling—and the momentum of the water slams into a closed valve. The result? A shock wave that reverberates through your plumbing system, causing pipes to shake and bang against studs, joists, or other pipes. It’s startling, sure—but it can also be damaging.
Is water hammer bad? Yes—if left unchecked, it’s more than just a spooky noise. The force of repeated water hammer can loosen pipe fittings, crack joints, or even lead to leaks behind your walls over time. That’s why addressing the problem early is key.
What Causes Water Hammer?
-
High water pressure (often over 60 psi)
-
Fast-closing valves (common in dishwashers and modern faucets)
-
Loose or poorly secured pipes
-
Air chambers or arrestors that have failed or are missing
How to Fix Water Hammer
Start by checking your water pressure. If it’s too high, a plumber can install or adjust a pressure-reducing valve. In some cases, water hammer arrestors—small devices that absorb shock—can be added near the offending appliances, like your dishwasher or washing machine. These act like silencers in your plumbing system, cushioning the impact when water flow stops suddenly.
For homes with older plumbing, it may be necessary to inspect or drain air chambers (vertical pipes designed to absorb pressure spikes) or secure loose piping that’s rattling in the walls.
If you’re unsure where to start, calling in the pros for a full inspection and water line service is the safest bet.
Preventing and Addressing Plumbing Sounds
To prevent and address these spooky plumbing sounds, homeowners can take the following steps:
- Regular Maintenance: Schedule regular plumbing inspections to catch potential issues before they become major problems.
- Pressure Regulation: Ensure the home’s water pressure is set to the recommended range (40-60 psi) to prevent excessive strain on pipes.
- Quality Fixtures: Use high-quality plumbing fixtures and parts to reduce the likelihood of wear and tear.
- Prompt Repairs: Address plumbing issues as soon as they are noticed to prevent them from worsening over time.
When to Call a Professional
While some minor plumbing issues can be handled by homeowners, it’s important to know when to call a professional plumber. If you encounter any of the following situations, it’s best to seek professional help:
- Persistent Noises: If plumbing noises persist despite attempts to fix them, a professional can diagnose and resolve the issue.
- Visible Damage: Signs of water damage, such as stains or microbial growth, indicate a potentially serious plumbing problem that needs immediate attention.
- Major Repairs: For extensive repairs or repiping, professional expertise ensures the job is done correctly and safely.
About Plumbing, Cooling & Electrical Nerds
Plumbing, Cooling & Electrical Nerds has been happy to serve Naples, FL for years. They offer clean and prompt service with a smile. They also provide upfront pricing, and every job comes standard with a 100% satisfaction guarantee for customer peace of mind. Call for plumbing service!
