The short answer
Acoustic Leak Detectors
Acoustic detectors pick up the sound of water escaping a pipe. A sensitive microphone or ground microphone amplifies the hiss or rush of water, even through concrete or drywall. The pros use these to pinpoint the exact spot by listening along the pipe path.
You can rent a basic listening device, but interpreting the sound takes practice. Background noise from appliances, traffic, or wind can confuse the reading. For a tricky leak, the pros combine acoustic tools with other methods to confirm the location before any digging or cutting begins.
- Handheld listening discs for floors and walls
- Ground microphones for slab leaks
- Noise correlators that compare sound at two points
- Headphones to block ambient noise
- Sensitive probes for tight spaces
Thermal Imaging Cameras
Thermal cameras show temperature differences on surfaces. A leaking hot water pipe warms the surrounding drywall or flooring, while a cold water leak can create a cooler spot. The camera displays these variations as a color map, helping you see where moisture might be hiding.
Thermal imaging works well when the temperature difference between the water and the surface is clear, so it is the right choice when that difference is noticeable. It cannot see through thick concrete or metal, and it does not measure moisture directly. A thermal scan is a useful first step, but it is often paired with a moisture meter to confirm the presence of water.
Moisture Meters
Moisture meters measure the water content in building materials. Pin-type meters push two small probes into drywall or wood, while pinless meters scan the surface without leaving holes. Both types give a reading that tells you if a material is abnormally wet.
These tools are handy for confirming a suspected leak area. You can buy a basic pinless meter at a hardware store, but readings vary by material and depth. The pros use calibrated meters and compare readings across a room to map the extent of hidden moisture accurately.
Tracer Gas Detection
Tracer gas detection involves filling a pipe with a safe gas, usually a mix of hydrogen and nitrogen, then using a sensor to find where the gas escapes. The gas is lighter than air and rises through soil or concrete, making it detectable at the surface. This method is especially useful for slab leaks or leaks under driveways.
The process takes time and requires special equipment, so it is not a DIY project. The pros may use tracer gas when other tools fail to locate a leak. It is a reliable way to find small leaks that do not produce enough sound or heat for other methods.
When to Call the Pros
If you suspect a hidden leak but cannot find it, act quickly. Turn off the water supply to the affected area and check your water meter for movement. A steadily moving meter even with all fixtures off is a strong sign of a leak somewhere in the system.
The pros have the training and equipment to locate leaks with minimal damage. They also handle the cleanup and drying after the source is found. If you live in Mesa, keep the shutoff valve location written down so you can stop the water fast. For help after a leak is found, see the related services below.
- Check your water meter before and after a two-hour period of no water use
- Look for unexplained damp spots, musty odors, or peeling paint
- Listen for the sound of running water when everything is off
- Monitor your water bill for sudden increases
- Turn off the main shutoff valve if you suspect a major leak
Need help right now?
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (480) 898-4279Frequently asked questions
Can I buy a leak detector for home use?
Yes, basic moisture meters and acoustic listening devices are available at hardware stores. They can help you find obvious leaks, but hidden leaks behind walls or under slabs often need professional equipment like thermal cameras or tracer gas detectors.
How do I know if I have a hidden leak?
Watch for unexplained increases in your water bill, damp spots on walls or floors, a musty smell, or the sound of running water when all fixtures are off. A water meter test can confirm a leak is present.
What should I do if I find a hidden leak?
Turn off the water supply to the affected area or the main shutoff valve. Then contact a local water damage pro to locate the exact source and begin cleanup. The pros use specialized tools to minimize damage and dry the area properly.