Running water sound leak detection: what to know in Arizona
Water escaping from a pressurised line makes a sound that travels through concrete. At night, when the house is still, it becomes easier to hear.
The same sound can come from fixtures and equipment, so the question is whether it persists with everything off.
Slab leak signs people notice
Tell the dispatcher the year the home was built and whether there is a pool.
Warm Tile Underfoot? Call NowWhy Arizona homes get slab leaks
Slabs transmit sound. In a single-story Valley home with tile, a leak can be heard from a long way off, and sometimes the loudest spot is not above the leak.
Fixtures, water heaters and cooler feeds also make water sounds, so a recording or a note of where and when helps.
What to do about running water sounds
Listen at night with the dishwasher, washer and ice maker idle. Note which room is loudest. Check the meter with all taps off.
Do not open walls or flooring. If the sound stops when the irrigation or a toilet is quiet, tell us.
What a leak detection technician does
The technician isolates lines and tests for pressure loss. Acoustic equipment is then used to find where the sound is loudest through the slab, and the source is marked.
You will be shown the mark and told how confident the reading is.
The contractor gives you a quote, and nothing starts until you agree to it.
Another Pinhole? Call NowListening in your own house
The best time to listen is late at night or early in the morning, when the house is quiet and the air conditioner is not cycling. Stand in different rooms, near walls and near the water heater, and listen for a hiss, a trickle or a soft rushing sound.
Sounds travel. Water in a pipe can be heard some distance from the leak, and a noise at one wall may start somewhere else. Write down where it is loudest and whether it changes when you shut off the main.
Other things sound like running water. Evaporative coolers, a softener or filter flushing, a pool pump, and a toilet refilling all make similar noise. The meter test helps tell them apart.
The technician uses listening equipment to locate the source from the floor. Your notes on where you heard it give them a starting point.
What the sound can tell you
A steady hiss or trickle with every fixture off is one of the clearest signs that water is moving somewhere it should not be. A sound that changes with water use is usually a fixture; one that stays the same with everything off is worth checking.
Pitch can be a clue. A higher hiss often comes from water escaping under pressure; a lower rush can be a larger flow. Neither tells you exactly where it is.
Write down when you hear it, where it is loudest and whether it stops when the main is closed.
Then do the meter check. A moving meter alongside the sound strengthens the case for a leak.
How the technician listens
The technician uses acoustic equipment to listen through the floor. Sensors pick up the sound of water escaping, and the technician moves along the line until it is loudest.
Listening works best once the leaking line has been isolated and confirmed by pressure testing. That way the search covers the right line.
Background noise matters. Air conditioning, pool pumps and traffic can mask the sound. The technician may ask for equipment to be switched off during listening.
When the sound peaks, the spot is marked and you see it.
When the sound is something else
Evaporative coolers, softener or filter cycles, a pool pump, an ice maker or a toilet refilling all make similar sounds. Turning them off one at a time can rule them out.
Sounds in walls can come from lines expanding as hot water runs. Those usually stop when no hot water is used.
If the sound continues with everything off and the meter moves, call.
If the sound stops when you close the main and the meter is still with the main open and everything off, describe both results to the dispatcher.
Recording what you hear
Sounds are hard to describe over the phone. If you can, record a short clip on your phone near where the sound is loudest. Note the time and what was running in the house.
Record a second clip with the main shutoff closed, if you can reach it safely. If the sound stops, water moving in the house lines is the likely cause.
Note whether the sound is constant or comes and goes. A constant hiss with everything off is the more telling one.
Note where in the house it is loudest. Sounds travel through pipes and walls, so the loudest point is not always over the leak, but it gives the technician a starting point.
Bring the clips and notes to the call. The dispatcher can pass them on.
Sounds that come and go
A sound that comes and goes can be harder to pin down than one that is constant. Toilets that refill, ice makers, softeners and irrigation valves all make intermittent sounds.
A leak under a slab is usually constant, because the line is under pressure all the time. If the sound is intermittent, it is more likely to be a fixture or an appliance.
Note when the sound happens and how long it lasts. A pattern points to something on a schedule.
If the sound is intermittent but the meter moves with everything off, the two may be unrelated. Call with both results.
The technician listens with equipment that can pick up sounds the ear cannot.
Background noise and listening
Arizona homes have a lot of background noise: air conditioning, pool pumps, ceiling fans and traffic. All of these can make it harder to hear a leak.
Listening for a leak yourself works best late at night, with the air conditioning paused for a few minutes if that is comfortable.
The technician may ask for the same quiet during the visit.
Acoustic equipment can filter out some background noise, but quiet still helps.
If you hear the sound only at certain times, note them.
A typical call about a sound
A homeowner hears a faint hiss in the hallway late at night, when the house is otherwise quiet. Every tap is off. The meter indicator turns slowly, and keeps turning with the irrigation controller off.
The technician confirms the meter and isolates the house lines. The hot side holds; the cold side loses pressure. Listening along the cold line finds the sound strongest near the hallway closet, close to where the homeowner heard it.
Not every sound leads so directly to the leak. Sound travels along pipes and through the slab, and the loudest point in the house is not always over the leak.
That is why the technician relies on testing and acoustic equipment rather than ears alone. The spot is marked, the homeowner sees it and the repair options are explained.
Earlier leaks, where they were and what was done, help the technician plan.
Ask About Reroute OptionsQuestions about running water sounds
Is a hiss always a leak?
No. Fixtures and equipment can cause it. A hiss that continues with everything off is worth checking.
Can you hear a leak with a phone?
Not reliably. Technicians use acoustic equipment.
The sound comes and goes.
Mention the pattern. Intermittent sounds can be fixtures.
Can neighbors' pipes cause it?
In townhomes, possibly. The technician will check your lines first.
What if the sound stops when I shut off the main?
That points to water moving in the house lines. Tell the technician.
Can the noise be outside the house?
Yes. Outdoor lines and equipment can be heard indoors.
Why do I hear it at night only?
The house is quieter. Leaks run all day, but you notice them when other noise stops.
Should I open a wall to find it?
No. Locating the source from the floor is what the equipment is for.