What it is
Leak detection Leak detection is the process of finding a hidden water leak inside walls, under a slab, or in a buried service line without tearing open the house to look. A plumber uses listening equipment, thermal imaging, pressure tests, and line tracing to narrow the leak to one spot before any repair starts.
A precise location means a small, targeted opening instead of guesswork demolition. That protects your floors and walls and keeps the repair focused on the actual failed pipe.
Afford-A-Rooter Plumbing has served Denver area homes since 2006. Our Denver leak detection services are built for the leaks you cannot see. Early fall is a good time to check. Furnaces kick on, heat runs through floors and walls, and a slow leak that hid all summer often starts to show. This guide covers the warning signs, the tools pros use, and what shapes the cost.
What are the signs of a hidden leak in a Denver home?
The most common signs are a water bill that jumps with no change in use, a meter that moves while every fixture is off, warm spots on a slab floor, damp or stained drywall, the sound of running water when nothing is on, and a musty or mold smell that will not go away.
Any one of these is worth a closer look. Two or more together usually point to a real leak. If the bill is the first clue, our sudden high water bill guide walks through the simple causes first, like a running toilet.
How do you test for a leak with your water meter?
Turn off every faucet, appliance, and irrigation zone. Make sure the toilets are not refilling. Then find your water meter and watch the dial or the small leak indicator for several minutes. If it moves while nothing in the house uses water, water is escaping somewhere between the meter and your fixtures.
- Shut off all faucets, showers, and hose bibs
- Pause the dishwasher, washer, ice maker, and water softener
- Turn off irrigation at the controller
- Wait until toilets stop refilling
- Note the meter reading or watch the leak indicator
- Check again after a set time with nothing running
- If the reading changed, call for leak detection
A meter test tells you a leak exists. It does not tell you where. That is the job of the tools below.
How do plumbers find leaks without tearing out walls?
Plumbers combine several non invasive methods. Acoustic listening picks up the sound of water escaping a pressurized pipe. Thermal imaging shows temperature changes from hot water leaks or wet materials. Pressure testing isolates which line is losing water. Line tracing maps where buried or hidden pipes actually run, so the opening goes in the right place.
Acoustic equipment is often the main tool for slab and yard leaks. The technician moves a sensor across the floor or ground and listens for the loudest point. Thermal cameras help most with hot water lines and wet drywall. A camera inspection fits drain and sewer leaks, where a small camera travels inside the pipe. Most visits use more than one method so the findings confirm each other.
Is it a slab leak, a wall leak, or a yard service line leak?
Where the leak sits changes the clues and the repair. Slab leaks run under concrete floors and often show as warm spots or cracked flooring. Wall leaks show as stains, soft drywall, or peeling paint. Yard service line leaks show as soggy ground, unusually green grass, or a running meter with dry indoor surfaces.
Many homes across the metro sit on slabs or have finished basements, so slab and wall leaks are common calls. If you suspect a slab leak, our leak under slab page explains that specific problem. Once the leak is found, our broken and leaking pipe repair team handles the fix.
Which sign points to which leak location?
Use this table as a starting point. It matches common symptoms to where the leak usually is and the method a plumber typically uses to confirm it.
| Sign | Likely leak location | Detection method |
|---|---|---|
| Warm spot on a slab floor | Hot water line under the slab | Thermal imaging and acoustic listening |
| Meter moves with all fixtures off | Supply line, slab, or yard service line | Pressure testing to isolate the line |
| Damp or stained drywall | Supply or drain pipe in the wall | Thermal imaging and moisture readings |
| Sound of running water when nothing is on | Pressurized supply line | Acoustic listening |
| Soggy patch or extra green grass in the yard | Buried water service line | Line tracing and acoustic listening |
| Musty or mold smell | Slow leak in a wall, floor, or cabinet | Moisture readings and thermal imaging |
| Slow drains with wet spots near a drain line | Cracked drain or sewer pipe | Camera inspection |
What affects the cost of leak detection in Denver?
Cost depends on how hard the leak is to reach, where it sits, and what the pipe is made of. A leak behind an open basement wall is simpler than one under a finished slab or a long yard run. Copper, galvanized, PEX, and older materials each need different approaches to locate and repair.
Access is usually the biggest factor. Finished floors, tile, cabinets, and landscaping all add care to the work. The number of lines that need testing matters too. We explain what we found and the repair options before any work starts, so you can make the call with real information.
Why does fall heating season reveal hidden leaks?
When the furnace starts running in late September and October, homes dry out and heat moves through floors and walls. A hot water leak under a slab can create a warm spot you never noticed in summer. Damp areas can also smell stronger once windows close and air circulates indoors.
Fall is also the right time to prepare for freezes. Our guide on how to winterize your plumbing covers the basics. If a pipe does fail, read what to do when a pipe bursts in your Denver home and shut off the main first. Live north of Denver? See when Boulder leak detection makes sense for the same warning signs.