Leak detection
Find it before anybody opens anything
A leak you can see is a repair. A leak you can only hear, smell, or read on the water bill is a diagnosis first, and getting the diagnosis right is what keeps the repair small. Acoustic listening, thermal imaging, tracer gas and line isolation, before a single tile comes up.
Statewide, and yes, this is one you can book for daylight hours.
Symptoms
What a hidden leak looks like before it looks like water
Almost nobody calls about a leak they can see. These are the reasons people actually pick up the phone.
The bill stepped up
Same household, same habits, noticeably more water. A continuous supply leak is a tap left running in a place you cannot see, and the bill is often the first honest witness.
A sound with nothing running
A faint hiss or trickle in a quiet house at night, sometimes only audible at one wall or one point on the floor. Pressurised water escaping makes noise, which is exactly what acoustic detection exploits.
Warm or damp flooring
A warm band across a slab floor is a hot-water line beneath it. Cupped hardwood, a soft spot in vinyl or grout that stays dark in one area are all worth taking seriously.
Smell before sight
A musty, earthy smell in one room, or around a bath or a laundry, usually means a slow drain leak wetting a cavity. Odour precedes visible staining by a long way.
More than one of those? Worth a detection visit before it becomes a repair-and-restoration visit.
Book DetectionDo this before you call
The meter test takes fifteen minutes and costs nothing
Shut everything down
Every tap closed, no washing machine or dishwasher running, ice maker off, irrigation off. If anybody in the house might flush a toilet in the next quarter of an hour, tell them not to.
Read the meter twice
Note the numbers, or watch the small leak-indicator dial that many meters have. Wait fifteen minutes without using water and read it again. Any movement at all means water is leaving the system somewhere.
Split the house from the yard
Close the shutoff where the line enters the building and repeat. Still moving means the leak is between the meter and the house; stopped means it is inside. That single result changes the entire scope of the job.
Bring this to the call
Meter moving or still, inside or outside the house, roughly when the bill changed, and whether you have a basement, crawl space or slab. Those four facts routinely cut an hour off the visit.
One caveat worth knowing: a toilet flapper that leaks intermittently will fail this test in a way that looks like a hidden leak, and it is the single most common false positive. Put a little food colouring in the tank and see whether it reaches the bowl without a flush. It is a five-minute check that occasionally saves a detection visit entirely.
Method
Four techniques, used in combination
No single instrument finds every leak, and anyone claiming one does is selling equipment rather than diagnosis. In practice a leak is located by narrowing: isolate sections to prove which part of the system is losing water, then bring the appropriate instrument to that section.
Line isolation and pressure testing
The unglamorous, decisive step. Close valves to divide the system, pressurise a section and watch whether it holds. This is how a pro proves the leak is in the hot side rather than the cold, in the yard rather than under the house, in the supply rather than the waste. Everything afterwards is refinement.
Acoustic listening
Water escaping a pressurised pipe makes a characteristic noise, and ground microphones and contact probes amplify it. On a buried service line the operator walks the run listening for the peak; on an interior wall or a slab the sound is traced to a point. Background noise is the enemy, which is why some detection work happens early in the morning.
Thermal imaging
A camera that reads surface temperature rather than seeing through anything. Its value is with hot-water lines, a warm stripe across a slab or up a wall is nearly diagnostic, and with the cool, evaporating patch left by a cold-water leak on drywall or plaster. Used to confirm and refine, not to search blind.
Tracer gas and dye
For the awkward cases. A safe gas mixture is introduced into a drained line and a sensitive detector finds where it surfaces, which works under concrete and through backfill where sound does not carry well. On waste lines, dye and controlled flood testing show which fixture or which section is wetting a cavity.
The instrument is not the skill. Knowing which section to isolate first is the skill, and it comes from having been in a few hundred houses of the same era in the same town.
Located, then repaired. One visit where the ground and the pipework allow it.
Talk to a Pro TodayKentucky specifics
Why a leak here often refuses to show itself
In much of the state, the ground does not cooperate with the usual give-away signs.
Karst limestone
The puddle that never appears
Across the Bluegrass, central Kentucky and the cave country, water that escapes a buried line drains away downward through fissured limestone instead of surfacing. A yard leak that would leave an obvious wet patch elsewhere leaves nothing here.
So the meter and the microphone do the work that your eyes would do in other states. No wet spot is not evidence of no leak.
Crawl spaces
Weeks of leaking, nobody up above notices
An enormous share of Kentucky houses sit over a vented crawl space that people enter once a decade. A supply line can weep down there for a season with no ceiling stain, no sound upstairs and nothing visible at all.
The evidence is sagging insulation, a musty smell at the floor registers, and eventually joists that have been wet too long.
Long private runs
Rural service lines that go a long way
In the eastern counties and out on farm properties, the run from meter or well to house can be very long, often shallow, and sometimes of unknown material and vintage.
Detection there is a walk with a microphone rather than a look at a wall, and the repair conversation is frequently about replacing a run rather than patching a point.
Slab, crawl space, basement, city water or well, it all changes the method.
Related work
Where hidden leaks are usually hiding, and what happens once one is found.
Questions
Leak detection, answered straight
The reliable indicator is the meter: shut every fixture and appliance in the house, then watch the meter dial or leak indicator for fifteen minutes. Any movement means water is going somewhere. Supporting signs are a bill that stepped up without a change in habits, a warm patch on a floor, a musty smell in one room, or the sound of running water when nothing is running.
No, that is the entire point of detection. Acoustic listening, thermal imaging, tracer gas and line isolation locate the leak first, so that if anything is opened it is opened in the right place. Cutting concrete to look for a leak is a last resort and usually a sign that the diagnosis was skipped.
Yes, and slab leaks are one of the main reasons detection exists. Pressurised water escaping under concrete makes noise that can be traced acoustically, and a hot-water line under a slab often shows as a warm band on a thermal image. Once located, the choice is between a targeted opening and rerouting the run overhead, which is frequently the cheaper answer.
Common, and often invisible in Kentucky because karst ground drains water away rather than letting it puddle. Detection uses acoustic equipment along the run and pressure isolation at each end to confirm the leak is on your side of the meter. The repair is then either a spot dig or a full service-line replacement depending on the pipe's age and material.
It is not a midnight emergency, but it does not improve with waiting. A supply leak runs continuously, and you pay for every gallon while it works on whatever is around it, subfloor, insulation, foundation soil. Slab and buried leaks in particular tend to be discovered as damage rather than as leaks.
Yes, though the method differs. Drains are not under constant pressure, so detection uses camera inspection, smoke or dye testing and sometimes a controlled flood test of a section. A leaking waste line under a slab or in a crawl space is a common source of persistent damp and odour without any visible water at all.
It tells you something is running, not where. A small continuous leak can add a surprising amount over a quarter, and a big one can be a shock. Comparing consecutive bills is useful evidence to bring to the call, along with roughly when the increase started, because timing often points to a cause.
A straightforward interior leak is frequently located within an hour or two. A buried service line on a long rural run, or a house where two things are going on at once, takes longer. A methodical pro will isolate sections rather than guess, and that isolation is where the time goes, and where the accuracy comes from.
Every day it runs, you are paying for it twice
Once on the water bill, and again for whatever it is quietly soaking. Get it located.