A hidden leak often shows up as a number before it shows up as a stain. Comparing this month's usage with the same month last year is the quickest way to spot one.
The meter test is something you can do yourself. Turn off every fixture and appliance, then watch the meter's small leak indicator. If it moves, water is going somewhere.
Leak Detection at a glance
- Service
- Leak Detection (Leaks & Pipes)
- Fixes
- Pinhole leaks in copper; Failed fittings behind walls; Toilet flappers leaking silently
- How it's done
- Meter and fixture test → Isolate → Locate → Repair
- Urgent?
- Usually schedulable; call now if water is leaking or sewage is backing up
- Where
- Gastonia and nearby Gaston County, NC
- Last reviewed
- 2026-10-06
Signs you need leak detection
- Water bill higher with no change in use
- Meter leak indicator spinning with everything off
- Stains, bubbling paint or soft drywall
- Warm spots on a slab floor
- Sound of running water when nothing is on
Common causes
- Pinhole leaks in copper
- Failed fittings behind walls
- Toilet flappers leaking silently
- Corroded galvanized pipe
- Underground water line breaks
How plumbers find hidden leaks without tearing out walls
The goal is one small, accurate opening instead of exploratory holes. Good leak detection costs less than the drywall and flooring it saves.
- Meter test: all water off, then watch the leak indicator to confirm a leak exists
- Isolation: closing valves to narrow the leak to the house, yard or one branch
- Acoustic listening: ground microphones pick up the hiss of pressurized water
- Thermal imaging: shows cool, wet areas in walls, ceilings and floors
- Moisture meters: confirm water in drywall, wood and subfloor
- Pressure testing: checks a specific line, such as a slab or yard line
Signs worth investigating
A water bill that jumps without a change in use, the sound of running water when everything is off, warm spots on a slab floor, musty smells, peeling paint, or a soggy strip in the yard between the meter and the house. In Gastonia's red clay, a yard leak can stay hidden for weeks because clay holds water and drains slowly.
Check the toilets first: a flapper leak is the most common silent leak and costs little to fix. Put food coloring in the tank and wait 15 minutes without flushing. Color in the bowl means the flapper is leaking.
How a plumber handles it
- 1Meter and fixture testRules out toilets and confirms a leak on the house side.
- 2IsolateValves are closed in stages to narrow down the section.
- 3LocateAcoustic, thermal and moisture tools pinpoint the spot.
- 4RepairMinimal opening to fix the leak, or a reroute if pipe is failing broadly.
How much does leak detection cost in Gastonia?
There's no honest flat price without seeing the job; a licensed plumber should quote before starting. These factors move the number most:
- Leak location (wall, slab, yard)
- Tools required
- Access and restoration
- Repair vs. reroute
What you can safely check, and what to leave alone
Safe to do
- Do the meter test
- Put food coloring in a toilet tank to check the flapper
- Check under sinks and behind toilets
Stop and call
- Don't open walls blindly
- Don't run a fan on a wet ceiling until power is safe
Leak Detection across Gastonia and Gaston County
Licensed plumbers handle leak detection in every Gastonia neighborhood and the surrounding Gaston County towns. What a job involves depends a lot on the age of the home, so the area guides below explain what to expect where you live. Areas where leak detection comes up most: Willow Creek, York-Chester, Downtown Gastonia, Forest Heights, Mount Holly, Lowell.
Gastonia neighborhoods
Before you call, these guides answer the most common questions: signs of a hidden plumbing leak; how to read your water meter to check for leaks; why water pressure drops; polybutylene pipe: what homeowners should know. For a quick symptom lookup, use the plumbing problem finder.
Leak Detection FAQs
How do I check for a hidden water leak?
Turn off all water, then watch the meter's leak indicator for several minutes. Movement means water is flowing somewhere.
Why is my water bill so high?
A running toilet is the most common cause. Hidden supply leaks, irrigation leaks and a broken yard line are next.
Is a pipe leak covered by the city?
Leaks on your side of the meter are the property owner's responsibility. Leaks at or before the meter are the utility's.
Can a plumber find a leak without opening walls?
Usually they can narrow it to a small area with acoustic, thermal and moisture tools, so only a minimal opening is needed for the repair.
How do I know if a toilet is leaking?
Put food coloring in the tank and wait 15 minutes without flushing. Color in the bowl means the flapper is leaking.
What are signs of a leak under a crawl space?
Musty smells, rising humidity, a higher bill and wet soil or insulation under the house.
Does a leak always show on the water meter?
Supply leaks do. Drain leaks don't, because drains only carry water when fixtures are used.
Who fixes a leak between the meter and the house?
That line is generally the property owner's responsibility, repaired by a licensed plumber.
