What is a hidden water leak?
Most plumbing runs behind drywall, tile and flooring. When a pipe or fitting leaks there, water soaks the wall cavity, insulation and subfloor long before it shows. By the time a stain appears, the leak may have been running for weeks.
Hidden leaks come from two kinds of plumbing: supply lines, which are always pressurized and leak all the time, and drains and showers, which only leak when they’re used.
Signs you may need hidden water leak detection
- Stains, bubbling paint or soft drywall
- Warped baseboards, or flooring lifting along a wall
- A musty smell in one room or closet
- Stains on the ceiling below a bathroom
- Loose tiles or grout that keeps cracking around a shower
- A water meter that moves with everything off
Common causes
- Failed shower pans, valves and supply lines behind the shower wall
- Leaking sink, toilet and appliance supply lines
- Drain connections that leak only when a fixture is used
- Pinholes in older copper pipe
- Water heater and washing machine connections in utility walls
Recognize these signs? The sooner the leak is found, the smaller the repair.
(877) 729-0265How we locate it
- Meter test and fixture isolationSeparates a supply-line leak from a drain or shower leak.
- Moisture mappingMoisture meter readings across walls and floors show where the water is coming from.
- Thermal imagingWet areas read cooler, and hot-water leaks warmer, on the wall’s surface.
- Acoustic listeningPicks up pressurized supply-line leaks inside walls and floors.
- Flood testChecks whether a shower pan holds water.
Want the details? Read how professional leak detection works.
Shower leaks: pan, valve or grout?
A shower can leak in three places, and they look the same from the outside. A failed pan leaks when water sits on the floor. A valve or supply line leaks all the time, or whenever the shower runs. Grout and caulk let splash water get behind tile. Testing each separately means you fix the real source instead of re-grouting and hoping.
What to do before we arrive
- Do a meter test with all water off to see if a supply line is leaking.
- Run the nearby fixture and watch whether the stain grows only after use.
- Close the shutoff valve for the fixture if you know the source.
- Dry what you can and take photos. The EPA advises drying water-damaged materials within 24–48 hours to help prevent mold.
After we find the leak
We mark the source and document it with photos and readings, so the opening is small and in the right place. Our plumbing partner can make the repair, or your own plumber can.
If you need it for insurance, a thermal imaging inspection adds side-by-side thermal and regular photos.
What affects the cost
The cost depends on how many fixtures and lines need testing and whether a shower flood test is needed. Detection and repair are quoted separately, and we can arrange both through our plumbing partner. See what affects leak detection cost, or call for a quote for your home.
Helpful guides
- Burst Pipe: What to Do, What Causes It and How It's Repaired
- Leak Under the Sink: How to Find It in a Kitchen or Bathroom
- Washing Machine Leaking From the Bottom: Causes and Fixes
- Outside Spigot Leaking: Dripping, Handle Leaks and Leaks Inside the Wall
- Polybutylene Pipe Replacement: How to Identify It and What It Costs
- How to Shut Off the Water to Your House
- How to Find a Water Leak Inside a Wall
- Water Leaking From the Ceiling: What to Do and How to Find the Source
- Shower Pan Leak: Signs, How to Test It and What to Do
- Toilet Leaking at the Base: Causes, Fixes and Hidden Damage
- Refrigerator Water Line Leak: How to Find It and Fix It
- Water Softener Leaking? Causes and Fixes for Indiana Homes
- Water in the Basement or Crawl Space: Plumbing Leak or Groundwater?
- Water Bill Leak Adjustment in Indiana: How to Request One
- Water Leak Emergency: What to Do in the First Hour
- Why Is My Water Bill So High? 9 Things to Check
- Smart Water Leak Detectors vs. Professional Leak Detection
- Frozen Pipes: How to Find a Hidden Leak After a Freeze
Where we offer hidden water leak detection
We’re based in Bargersville and provide hidden water leak detection across Johnson County and nearby towns: Bargersville, Greenwood, Franklin, Center Grove, Whiteland & New Whiteland, Trafalgar, Nineveh & Prince’s Lakes, Morgantown and Southport & Perry Township.
Town pages for this service: Hidden Water Leak Detection in Greenwood, Leaking Pipe Repair in Greenwood, Hidden Water Leak Detection in Franklin, Leaking Pipe Repair in Franklin, Basement & Crawl Space Leak Detection in Franklin, Hidden Water Leak Detection in Center Grove and Leaking Pipe Repair in Center Grove.
Frequently asked questions
Is my shower leak coming from the grout or the pipes?
That’s what the tests separate. A flood test checks the pan, a pressure test checks the supply lines, and running the shower shows splash and grout leaks.
How do you find a leak inside a wall without opening it?
With a meter test, fixture isolation, moisture mapping and thermal imaging. Acoustic listening helps on pressurized lines. The wall is opened only at the marked spot.
Can a hidden leak cause mold?
Yes. A slow leak keeps materials wet far longer than the 24–48 hours the EPA gives for drying water-damaged materials to prevent mold growth.
