What is leak detection?
Leak detection is the use of meter tests, acoustic listening devices, thermal cameras and pressure tests to find a hidden water leak before any wall or floor is opened.
A leak detection visit ends with a marked leak location. The repair opens one small area instead of a whole wall. Household leaks waste nearly 10,000 gallons of water a year in the average home, according to the EPA WaterSense program.
What are the 6 signs of a hidden water leak?
The 6 signs of a hidden water leak are listed below, from the most common to the least common.
- A high water bill rises with no change in water use.
- The water meter dial moves while every fixture is off.
- Damp spots, stains or bubbling paint appear on walls or ceilings.
- Warm spots on the floor point to a hot water slab leak.
- The sound of running water comes from the walls at night.
- Mold or a musty smell builds in one room.
Seeing one of these signs? Call a local plumber now.
Call (607) 305-8020How does a plumber detect a hidden leak?
A plumber uses the 5 steps below to detect a hidden leak.
- Reads the water meter with every fixture off to confirm a leak.
- Isolates the hot side, the cold side and the outside lines.
- Listens to the pipes with an acoustic leak detector.
- Scans walls and floors with a thermal camera.
- Marks the leak location and explains the repair.
How much does leak detection cost in Lancaster, PA?
Leak detection in Lancaster, PA costs about $100 as an add-on to a plumbing visit, and slab leak detection costs $125–$400, according to HomeAdvisor. Leaking pipe repair costs $150–$350 once the leak is found.
Typical prices for 4 leak detection jobs are shown in the table below.
| Job | Typical price |
|---|---|
| Leak location diagnosis (add-on) | about $100 |
| Slab leak detection | $125–$400 |
| Leaking pipe repair | $150–$350 |
| Slab leak repair | $500–$4,000 |
Source: HomeAdvisor national cost data, 2025–2026. Ranges are what most homeowners pay; your plumber gives the price for your job before work starts.
Want a price for your job? Call and describe the problem to a local plumber.
Call (607) 305-8020What causes hidden water leaks?
The 6 causes of hidden water leaks are listed below.
- Freeze-thaw cycles and settling soil stress buried pipes and crawl space pipes.
- Corrosion eats through old galvanized and copper pipe from the inside.
- Seals and joints at fittings wear out with age.
- Water pressure above 80 psi strains pipes, joints and fixture valves.
- Cracked fittings and fixtures leak inside walls and cabinets.
- Nails and screws driven into walls puncture supply pipes.
Related plumbing problems and next steps
When is a leak detection problem an emergency?
A leak detection problem is an emergency when water comes through a ceiling or reaches electrical outlets. Close the main water valve, switch off the breaker for that area and call a plumber. Emergency calls for leak problems go to an emergency plumber in Lancaster, PA.
What services are related to leak detection?
The 3 services related to leak detection are listed below.
- Slab leak repair signs, steps and prices are on the slab leak repair in Lancaster page.
- High water bill no visible leak has 5 causes, listed in the high water bill no visible leak guide.
- Water meter spinning with water turned off has 4 causes, listed in the water meter spinning with water turned off guide.
Where else in Lancaster County is leak detection available?
Leak detection pages for 3 nearby Lancaster County towns are listed below.
- Elizabethtown (ZIP 17022) leak detection calls go to Leak Detection in Elizabethtown.
- Lititz (ZIP 17543) leak detection calls go to Leak Detection in Lititz.
- Ephrata (ZIP 17522) leak detection calls go to Leak Detection in Ephrata.
Frequently asked questions
How much should a leak detection cost?
A leak detection costs about $100 as an add-on to a plumbing visit, and slab leak detection costs $125–$400, according to HomeAdvisor.
Does house insurance cover leak detection?
It depends on the policy. Homeowners policies that cover sudden water damage pay for the access and repair in some cases, and the policy decides whether the detection fee is included.
How long does leak detection take?
Leak detection takes about 1 to 2 hours in most homes, based on access to the pipes and the size of the plumbing system.
How do you tell if a leak is on the main line or inside the house?
You tell if a leak is on the main line or inside the house by closing the main shut-off valve and watching the water meter. A meter that keeps moving points to a leak on the line before the valve.
What is a smart water shutoff valve?
A smart water shutoff valve is a device on the main water line that tracks water flow, sends a phone alert for unusual flow and closes the main during a large leak.