Water Leak Repair in Greensboro, NC: Found, Fixed and Tested
A stain on the ceiling, a warm patch of floor, or a water bill that jumped for no reason. We trace the leak to its source, repair it, and prove the line holds before anything is closed up.
- Leaks in walls, ceilings, floors, slabs and yard lines
- Active leaks handled at any hour, at the same rate
- A written price before any work starts
Water coming through a ceiling or across a floor? Close the main valve first, then call.
Most water leaks in Greensboro homes are not dramatic. A fitting weeps inside a wall. A gray plastic line seeps behind a cabinet. A yard line loses water into red clay where nobody looks. Often the first sign is the city water bill.
This page covers how to tell whether you have a leak, what to do in the first few minutes, how a leak is found without taking the house apart, and how it is repaired. If water is pouring out right now, close your main valve and call.
Found a leak? What to do right now
Most leaks give you a few minutes to think. Use them in this order.
Sinks and toilets have a small valve on the wall or floor beneath them. The washing machine has two behind it, and the water heater has one on its cold inlet. Turn it clockwise, or a quarter turn if it has a lever.
If that does not stop it, close the main valve. Our burst pipe repair page shows where it usually is in a Greensboro house (crawl space wall, garage, or front basement corner).
Keep water and electricity apart. If water is near outlets, a light fitting or the panel, switch that circuit off at the breaker from a dry spot.
Put a bucket under a drip and move rugs, boxes and furniture out of the wet area before moisture soaks into subflooring.
Take photos and write down the time. Note your meter reading too, if you can get to it safely at the street curb.
If the fixture valve stopped it, you have turned an emergency into an appointment. The rest of the house still has water.
When a leak is an emergency
Not every leak requires a midnight truck. Here is how we categorize urgency when you call.
Call now, at any hour
- Water you cannot stop with any valve
- Water coming through a ceiling or a light fitting
- Water near the electrical panel or outlets
- Hot water leaking from the heater or a hot line
Call for a same-day visit
- A leak you stopped at the fixture, in the only bathroom or the kitchen
- A warm or damp patch on the floor
- The sound of running water with everything off
- A wet strip of yard that keeps growing
Book a visit
- A slow drip under a sink that a bucket is catching
- A toilet that keeps running
- A dripping outdoor faucet
- A higher water bill with no water in sight
Signs of a hidden leak
Most of the leaks we repair were never seen as dripping water. The owner noticed something else first.
Water use that is higher than last month with no change in the household.
A hiss or the sound of running water when every tap is off.
A stain, bubbling paint, soft drywall, or a baseboard that has swollen or pulled away.
A warm patch on a concrete floor, hardwood that has cupped, tiles that have come loose, or damp carpet.
A musty closet or cabinet that never airs out.
Pressure that has dropped at one fixture or through the whole house.
A heater that seems to run all the time, which points to a leak on the hot side.
A soggy or unusually green strip between the meter and the house in dry weather.
Standing water on the ground cover, or insulation that drips.
Water seeping near an outlet or switch requires cutting power at the main breaker before touching fixtures.
The meter test
Your water meter is the one instrument that cannot be fooled. This check uses the EPA's method and Greensboro Water Resources' own advice.
Turn off everything that uses water. That includes the ice maker, the washing machine and the sprinkler controller.
Read the meter, wait two hours, and read it again. If the reading changed and nobody used water, there is an active leak.
Now close the main valve at the house and watch the meter again. If it still moves, the water is escaping between the meter and the house. If it stops, the leak is inside.
Test each toilet with food coloring. Put a few drops of food coloring in the tank and wait ten minutes without flushing. Color in the bowl means the flapper is leaking.
Greensboro Water Resources Note: The city names the worn toilet flapper as the most common household leak in Greensboro. It is also the cheapest one to fix.
The sudden high water bill
Understanding Greensboro municipal billing structures and how hidden leaks drive up costs.
Why a leak is charged twice
The city bills water every month in units of 748 gallons. The volume charges for both water and sewer are based on the water that passed through your meter. So leaked water is charged twice, once on each line of the bill.
Per single billing unit
Wasted yearly by avg. leaky home
Lost by 1 in 10 homes (3.5 units/mo)
Greensboro Water Resources reports that one home in ten is losing 90 gallons or more a day without knowing it. Ninety gallons a day is about three and a half billing units added to your statement each month.
Two things to check first
Two things are worth checking before you assume the worst:
- Was the reading estimated? The bill marks each meter reading A for actual or E for estimated. A catch-up after an estimated month can look like a spike.
- What does GSO WaterWise show? The city's customer portal displays daily water use and sends real-time leak notifications. Steady use on days when nobody was home is a leak.
For questions about the bill itself, the City of Greensboro contact center is available at 336-373-2489.
The water leaks we repair
Where the water shows up tells us most of what we need to know about where it started.
| Where the leak is | What you notice | Where it usually starts |
|---|---|---|
| Inside a wall | A stain, soft drywall, a musty smell or a faint hiss | A supply line or fitting in the wall cavity, or the body of a shower valve |
| Above a ceiling | A brown ring under a bathroom, or a drip at a light fitting | A supply line or toilet connection upstairs, or a water heater in the attic |
| Under a floor | Cupped hardwood, damp carpet, a wet crawl space | A line under the floor, or the supply to a refrigerator, dishwasher or toilet |
| Under a concrete slab | A warm or damp patch, the sound of water, a meter that never stops | A hot or cold line buried in or below the slab |
| In the yard | A soggy strip, low pressure, a bill that jumped | The private water line between the meter and the house |
| At supply lines & shutoff valves | A drip under a sink or behind a toilet, green crust on a valve | A braided connector, a compression nut or the valve stem |
| At the water heater | A drip on top of the tank, a rust trail, water in the pan | The inlet and outlet connections, the relief valve or the drain valve |
| At a fixture | A toilet that runs, a faucet that drips, a tub spout that will not shut off | A flapper, fill valve or faucet cartridge |
| Outdoors | A dripping hose faucet, a wet spot near a sprinkler head | The faucet itself, or an irrigation line or valve |
What causes water leaks in Greensboro homes
A leak is nearly always one of six things: old pipe, a tired connection, too much pressure, moving ground, a past freeze, or damage.
The age of the pipe
Census figures put about one Greensboro home in five before 1960, and more than 37,000 housing units in the 1980s and 1990s. Those two groups leak for different reasons:
- Galvanized steel: In oldest houses, rusts from inside until seams weep.
- Copper: Develops pinholes with age, often in hidden cavities.
- Polybutylene (1978–1995): Turns brittle and seeps at its fittings.
- CPVC: Cream plastic that cracks at glued joints as it ages.
Connections, not pipe
More leaks start at a joint than in the middle of a pipe. Solder joints, crimp rings, threaded fittings and compression nuts all have a working life. So do the rubber washers inside braided supply hoses and the seats inside shutoff valves.
Water pressure
North Carolina's plumbing code limits pressure inside a house to 80 psi. Where the street supply runs higher, a pressure-reducing valve holds it down. When that valve wears out, every connection in the house is pushed harder than it was built for.
Red clay that moves
Most of the city sits on Piedmont clay. It swells when it is soaked and shrinks in a dry spell, and the North Carolina Geological Survey notes that expansive soils can turn up anywhere in the Piedmont. Buried water lines and pipes under slabs get flexed with every cycle.
A freeze that did not finish
A hard freeze does not always burst a pipe. Sometimes it opens a hairline split that weeps for months. These turn up in crawl spaces and outside walls long after the cold snap that caused them.
Accidental damage
A screw through a pipe when a shelf goes up. A line nicked during a remodel. A supply hose kinked behind a refrigerator that was pushed back too hard against the wall.
How a leak is located
A leak is narrowed down from the whole house to one spot before anything is opened.
Questions first: When did you notice it? Is the wet area warm? What does the bill history show? Is the house on a crawl space or a slab?
Confirm it at the meter: With everything off, the meter says whether water is still leaving the closed system.
Split the system in halves: Closing the house valve separates the yard line from the house. Closing the water heater's inlet separates hot from cold. Each valve rules out half of what is left.
Test what is left under pressure: A test gauge on the isolated section proves whether that specific loop holds pressure.
Follow the water: We look in the crawl space, the attic and under every sink, and map damp walls and floors to their wettest point.
Pinpoint, then mark it: Modern diagnostic instrumentation puts the leak within a small, precise area before anything is opened.
Explain and quote: You see where the leak is and what the repair involves before any cutting or digging begins.
Leak detection methods and what each one is for
We match the technology to the pipe material and building construction.
| Method | What it does | Where it is used |
|---|---|---|
| Meter and valve isolation Standard Baseline | Separates yard from house and hot from cold | Every leak |
| Pressure test Hydrostatic Verification | Shows whether a closed section of pipe holds pressure | Confirming a leak, and proving the repair |
| Moisture meter Moisture Mapping | Reads how wet drywall, wood or flooring is, so the wettest point can be mapped | Walls, ceilings and floors |
| Thermal imaging Infrared Heat Delta | Shows surface temperature differences left by hot water or evaporating moisture | Hot lines in slabs and walls |
| Acoustic listening Ground Microphones | Amplifies the sound of water escaping a pressurized pipe | Slab leaks and buried lines |
| Tracer gas Micro-Sniffer | A safe gas mix is put into the drained line and a detector finds where it surfaces | Buried leaks too quiet to hear |
| Line locating Electromagnetic Induction | Traces the route and depth of a buried pipe | Yard lines |
| Inspection camera Borescope | A small camera through a finger-sized opening | Wall and ceiling cavities |
| Dye test Visual Tablet | Color in the tank shows water slipping past the flapper | Toilets |
How We Repair Water Leak in Greensboro Home
The repair depends on what failed and where it is.
A leaking connection
A weeping joint, a shutoff valve that drips at the stem, a supply hose with a rusted collar. The part is replaced. This is the most common leak repair and the quickest.
A pinhole or split in the pipe
The damaged section is cut out back to clean, round pipe and a new piece is joined in. Copper is repaired in copper or changed over to PEX. Old plastic is cut back until it stops crumbling.
A leak inside a wall or above a ceiling
Once the spot is marked, one opening is cut, sized so a patch will cover it. The pipe is repaired through that opening. The cavity should stay open until it has dried, because closing damp framing behind new drywall is how mold starts.
A leak under a slab
There are three ways to fix it:
- Direct spot repair: Open the floor at the leak and repair that spot. Suits a single break in sound pipe.
- Overhead re-route: Run a new line through walls, attic or crawl space and abandon the pipe under the concrete.
- Complete line replacement: Replace lines altogether when the same slab has leaked more than once.
A leak in the yard line
A single break is dug up and repaired where it is. A line with several weak points, or one made of a material known to fail, is replaced from the meter to the house. Replacement needs a city plumbing permit, and buried utilities are marked through NC 811 before any digging.
A leak at the water heater
Leaks at the pipe connections, the relief valve or the drain valve can be repaired. Water coming from the tank body itself cannot. That tank has rusted through and needs replacing.
How every repair ends
The water goes back on, the pressure comes up, and the repair is watched until it is bone dry. Then every tap is closed and the meter is checked. If the meter is still, the leak is fixed.
Repair the leak, or replace the pipe?
Most leaks need a repair and nothing more. Five questions tell you when replacing pipe is the better use of the money.
Is this the first leak on this line?
One leak is an event. A second on the same run within a few years is a pattern.
What does the cut-out piece look like inside?
Ask to see it. Clean, full-thickness pipe means the rest is probably fine. Pitted, paper-thin or rust-choked pipe means the next leak is already on its way.
What is the pipe made of?
Sound copper and PEX are worth repairing. Polybutylene and rusted galvanized steel are not good candidates for patch after patch.
How hard is it to reach?
A second repair in an open crawl space is a nuisance. A second repair under a slab or behind a tiled shower costs as much as the first.
How long will you own the house?
A repair buys time. A replacement is something you do once.
What affects the cost of a leak repair
You get a written price before work starts. Six things move it up or down.
How long it takes to find
A drip you can see costs nothing to locate. A leak under a slab or somewhere along a yard line has to be tracked down first.
Where it is located
Under a sink is easy. Inside a tiled wall, above a finished ceiling, under concrete or under a driveway is not.
What component failed
A supply hose or shutoff valve is a small part. A corroded run of pipe is a bigger one.
Span of pipe cut back
How much pipe has to be replaced to get back to sound material on both sides.
Whether a permit applies
Replacing a water service line needs one from the city. A spot repair generally does not.
Structural restoration
What it takes to put things back. Drywall, tile, flooring, concrete and landscaping are separate from the plumbing.
How to keep the cost down before we arrive
Stop the water: Shut it off at the fixture or the main, so the damage stops growing.
Run the meter test: Tell us the result. Knowing whether the leak is in the yard or the house saves diagnostic time on site.
Clear access paths: Clear the way to the crawl space hatch, the water heater and the cabinets under the sinks.
Share house history: Tell us what you know about the house: its age, past leaks, and any plumbing that has been replaced.
City side or your side: how it works in Greensboro
By Greensboro Water Resources' rule, the city is responsible for leaks up to your property boundary. Past that point, a leak in the service line running into your home is private and belongs to the property owner.
If the leak is on the city's side
Water in the street, at a hydrant or coming up at the curb is the city's to repair.
The city maintains about 1,558 miles of water line, and roughly a third of it is cast iron at least 50 years old.
If the leak is on your side
Everything from the property boundary to the last faucet is yours: the buried line across the yard, the pipes in the house and every fixture. That is the work we do.
If the meter spins with your main house valve closed, the leak is in the yard service line. If it stops, the leak is inside the home.
If you cannot afford the repair
The city refers homeowners to its Housing & Neighborhood Development department, at 336-373-2349. Its Home Repair GSO program has offered grants of up to $20,000 to income-eligible owner-occupants, with plumbing among the covered repairs. Applications are not always open, so ask before you count on it.
If you rent and the landlord will not fix
The city directs tenants to its Landlord-Tenant Dispute Program or to Code Compliance for rental habitability enforcement.
If you worry about the yard line
The city has partnered with a company, SLWA, that sells optional protection plans for the outside water and sewer lines a homeowner is responsible for. We have no tie to it.
Municipal Permits & Inspections
A repair that puts back what was there generally needs no permit. Replacing the water service line does, through the city's Engineering & Inspections department. The permit and the inspection are part of the job when they apply.
Water damage and moisture
A slow leak has usually been wetting the house for weeks before anyone finds it. Stopping it does not dry what it soaked.
Wicks Water Upward
Drywall absorbs water like a sponge and goes soft, crumbly and discolored from the baseplate up.
Swells Then Rots
Wood swells first, then rots. Subfloors, sill plates and vanity cabinet bases are the usual casualties.
Traps Moisture
Fiberglass and cellulose hold moisture against studs, joists and ductwork, preventing natural evaporation.
Mold Follows Moisture
EPA guidance is to dry water-damaged items within 24 to 48 hours to prevent mold. A leak running for a month is well past that.
Why crawl spaces matter here in Greensboro
In a crawl space house, water from a leak above drips onto the plastic vapor barrier ground cover and stays there. Through a humid Greensboro summer it has nowhere to go. The air under the house stays saturated and the subfloor framing takes it up.
Key rule: If your leak was over a crawl space, have the space checked after the repair, not just the room above it.
Leave cavities open: Leave opened walls and ceilings open until the cavity is bone dry to the touch and to a moisture meter before closing drywall.
Active dehumidification: Run air movers and a dehumidifier in the room for several days to draw moisture out of the framing.
Discard soaked materials: Throw out what stayed wet too long. Carpet pad, soaked insulation and swollen particleboard do not recover.
Professional restoration: Call a water damage company if water ran inside wall cavities, through a ceiling, or across more than one room.
Preventing future water leaks in Greensboro
Catching a leak in its first week instead of its sixth month is where the money is saved.
- • Look at your daily water use in GSO WaterWise, and turn on its automated leak notifications.
- • Glance under each sink and behind each toilet. A crusty green or white ring on a valve is a leak that has started.
- • Shine a flashlight into the crawl space. Look for wet ground cover, dripping insulation and stained joists.
- • Check the top of the water heater and its drain pan for rust trails or standing water.
- • Exercise the main valve and each fixture shutoff valve off and on once, so they turn freely when you need them.
- • Dye-test every toilet: Greensboro Water Resources recommends checking toilets yearly. It also warns against drop-in tank tablets that erode flappers.
- • Check house pressure with a gauge at an outdoor faucet. Above 80 psi, the pressure-reducing valve needs replacement.
- • Walk the sprinkler system at spring start-up. Broken irrigation lines and outdoor faucets cause major unnoticed losses.
When the chance comes up
- ✓ Replace rubber washing machine hoses with braided stainless steel lines.
- ✓ Change old supply connectors whenever a faucet or toilet is replaced.
- ✓ Disconnect garden hoses from outdoor faucets before the first winter freeze.
- ✓ Have buried lines marked through NC 811 before digging for a fence, tree or mailbox.
- ✓ Place smart leak sensors under the water heater and the kitchen sink.
If your pipes are a known problem
If the house has gray polybutylene or rusting galvanized steel, plan the replacement on your own schedule.
The alternative is doing it one emergency leak at a time.
FAQs
Answers to the most common questions about hidden leak detection, non-invasive acoustic testing, water bill jumps, property line boundaries, and repairs in Greensboro, NC.
I cannot see any water. How do I know I have a leak?
Run the meter test. Turn everything off, read the meter, and read it again two hours later. If it moved, water is leaving the system somewhere.
Will you have to cut into my walls or floor?
Not to look for the leak. It is narrowed down from the outside first, so that one opening is made at the right spot. For a leak under a slab there is often a way to re-route the line and leave the floor alone.
Do you find leaks, or only repair them?
Both. Locating the leak and repairing it are one job for us, with one written price once the source is known.
How long can a small leak wait?
A drip under a sink that a bucket is catching can wait a few days. A leak that is wetting drywall, wood or flooring should not wait, because mold can begin within a day or two. If in doubt, close the valve that feeds it.
Why did my water bill jump when nothing changed?
Usually a leak, and often a toilet. Greensboro bills both water and sewer on what passes through the meter, so leaked water is charged twice. Check whether the reading was estimated, then look at your daily use in GSO WaterWise.
The leak is near the street. Is it mine or the city's?
The city repairs leaks up to your property boundary. Close your main valve at the house and watch the meter. If you see water in the street or at the curb, call Water Resources dispatch at 336-373-2033.
Does homeowners insurance pay for a leak repair?
It depends on the policy and on whether the damage was sudden or built up over time. We can give you a dated invoice and a description of what failed. Your insurer decides the rest.
I rent. Who is responsible for fixing the leak?
Your landlord. Shut off the water if you can and report it in writing. If a landlord will not repair a leak, the city points tenants to its Landlord-Tenant Dispute Program or Code Compliance.
Still have an active leak question?
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