# Slab Leak Repair in Columbus, Ohio

> Slab leak repair in Columbus: finding a supply leak under a concrete floor, then choosing a direct repair, a reroute through walls or ceilings, or a repipe.

URL: https://slaterepipingcolumbus.com/slab-leak-repair/

Supply leaks under concrete floors in slab houses and slab-on-grade additions, repaired through the floor or bypassed with a reroute through walls and ceilings.

Last Updated: October 29, 2026

Supply leaks under concrete floors in slab houses and slab-on-grade additions, repaired through the floor or bypassed with a reroute through walls and ceilings.

Last Updated: October 29, 2026

**31.5%** Columbus dwelling cards on County Auditor records with no basement, a group that includes condominiums

**37.2%** Whitehall dwelling cards with no basement, one of the highest shares near Columbus

**51.4%** Columbus dwelling cards with a full basement, where supply lines run overhead instead of under concrete

[Slate Repiping Columbus](https://slaterepipingcolumbus.com/) repairs and reroutes supply leaks under concrete floors for houses and small buildings in Columbus and nearby Franklin County communities. A slab leak is a leak in a water line buried in or under a concrete floor, so it cannot be seen and cannot be reached without either breaking the floor or going around it. The decision this page helps with is which of those to do. The work is carried out by licensed and insured plumbing contractors.

If you only suspect a leak and do not know where it is, [water leak detection](https://slaterepipingcolumbus.com/water-leak-detection/) is the first step. If water is coming up through the floor and will not stop, shut the main and treat it as an [emergency pipe repair](https://slaterepipingcolumbus.com/emergency-pipe-repair/); emergency calls are answered around the clock.

## Slab homes are the exception here

Most Columbus houses do not have their water lines under concrete. The County Auditor’s records show 51.4% of Columbus dwelling cards with a full basement and another 16.4% with a crawlspace or part-crawl, and in those houses the supply mains run along exposed basement joists or through the crawl. A leak there shows up overhead and is usually a straightforward [pipe repair](https://slaterepipingcolumbus.com/pipe-repair/).

The rest is a different picture. On the same records, 31.5% of Columbus dwelling cards list no basement. That figure includes condominium units, which make up a large share of it, so not every one of those homes is a slab house with pipe in the floor. Some suburbs have more single-family slab and no-basement houses: Whitehall records 37.2% of its dwelling cards with no basement and Reynoldsburg 36.2%. Ranch houses, newer subdivisions and condominium buildings are where slab-on-grade plumbing is most likely.

### Slab-on-grade additions on basement houses

The most common slab leak in a basement city is in the part of the house that was added later. Many older Columbus houses have a family room, a kitchen expansion, a sunroom or a converted garage built on a slab beside the original basement. Where a bathroom, wet bar or kitchen sink went into that addition, its supply lines may run under the new concrete. A leak there behaves exactly like a slab leak, even though the rest of the house is plumbed overhead.

## Signs of a supply leak under a slab

Supply lines are under pressure, so a slab leak runs constantly. The usual signs are:

- **A warm spot on the floor**, often from a leaking hot-water line.
- **Running water heard** under the floor with everything off.
- **A water meter that keeps moving** with every fixture closed.
- **Damp carpet, cupping wood or lifting tile** with no plumbing fixture above it.
- **A water heater that runs more often** than it used to.
- **A water bill that rose** without a change in use.

Drains also run under slabs, and a drain leak only leaks when something drains. Testing sorts supply from drain, and hot from cold, before any decision is made.

## How a slab leak is located

The meter test shows whether water is leaving the system. Closing the cold supply into the water heater separates the hot side from the cold, which tells you which line is leaking and often explains a warm floor. A pressure gauge on each side confirms it. From there, listening for the leak through the floor and reading surface temperature can narrow it down, especially on hot lines. These methods are described in general terms on the [leak detection page](https://slaterepipingcolumbus.com/water-leak-detection/). The location they give has a margin, and under concrete that margin matters, because every foot of uncertainty is more floor to break.

## Direct repair, reroute or repipe

### Direct repair through the slab

The floor finish is lifted, the concrete is cut and broken out over the leak, the pipe is exposed and repaired, and the floor is patched. This keeps the original layout and is the smallest plumbing job when the leak is precisely located and the pipe around it is sound. It is a poor fit when the location is uncertain, when the floor is finished in tile or wood that is hard to match, or when the pipe is old enough that the next leak is likely to be a few feet away.

### Reroute above the slab

Rerouting abandons the leaking line under the slab and runs a new one along a different path: up through a wall, across a ceiling or attic, and down to the fixture. The old line is cut and capped where it leaves the slab. No concrete is broken, and the new line is reachable later. The work moves to walls and ceilings instead, so the openings are listed in the scope. PEX is often used for reroutes because it bends through framing with fewer fittings, though copper is also allowed, and the [PEX vs copper guide](https://slaterepipingcolumbus.com/guide/pex-vs-copper/) covers the choice.

In an attic, a rerouted line needs to stay inside the insulation on the heated side. Columbus averages more than a hundred nights a year at or below freezing by NOAA’s normals, so a line laid on top of attic insulation trades a slab leak for a frozen pipe.

### Repipe overhead

Where the under-slab pipe has leaked more than once, or is the same age and material throughout, moving all of the supply piping out of the slab is the longer-term answer. A repipe runs new mains and branches through ceilings, walls and attic space and abandons the whole under-slab system. In a slab addition on a basement house, that may only mean rerouting the addition’s few lines back to the basement, which is a [partial repipe](https://slaterepipingcolumbus.com/partial-repiping/). In a full slab house, it is a [whole-house repipe](https://slaterepipingcolumbus.com/whole-house-repiping/), and the [guide to how invasive repiping is](https://slaterepipingcolumbus.com/guide/how-invasive-is-repiping/) describes what to expect.

## Permit and testing

Rerouting and repiping put new piping in the house, so they need a plumbing permit: Building and Zoning Services inside the City of Columbus, or the suburb’s permit office with Franklin County Public Health review in places such as Whitehall and Reynoldsburg. Whether a direct repair needs one depends on its scope. Either way, the repaired or new piping is pressure tested before the floor or the walls are closed.

## What a slab leak repair depends on

There is no flat price for slab leak work. The main drivers are how precisely the leak can be located, the floor finish over it, the length and difficulty of a reroute path, how much wall and ceiling has to open, the pipe material, and whether one line or the whole under-slab system is being replaced. Water damage to flooring and the structure is a separate matter for restoration and, often, insurance; the [homeowners insurance guide](https://slaterepipingcolumbus.com/guide/homeowners-insurance-repiping/) explains how sudden leaks and wear are usually treated, and the [repipe vs repair guide](https://slaterepipingcolumbus.com/guide/repipe-vs-repair/) helps decide whether one repair is the end of it.

## What's included

- Confirmation that the leak is on a supply line under the slab
- Isolation of hot and cold sides to show which line is leaking
- Location of the leak as closely as testing allows
- A written comparison of direct repair, reroute and repipe for the house
- The chosen repair, with the old under-slab line capped where it is abandoned
- Pressure test of the repair or the new route
- A list of floor, wall and ceiling openings and who closes each

## Three ways to deal with a supply leak under a concrete floor

|  | Direct repair through the slab | Reroute above the slab | Repipe overhead |
| --- | --- | --- | --- |
| What changes | One spot on the existing line | The leaking line is abandoned and replaced along a new path | All supply piping moves out of the slab |
| Openings | Floor cut at the leak, finish flooring lifted | Walls, ceilings or an attic along the new route | Walls and ceilings throughout |
| Old pipe under the slab | Stays in service | The leaking line is capped | All of it is capped |
| Fits when | One leak, located precisely, in pipe that is otherwise sound | One line has failed and the route above is reachable | Several leaks, or the under-slab pipe is the same age everywhere |

## Related resources

- Decision Guide [Repipe vs repair: which does your house need?](https://slaterepipingcolumbus.com/guide/repipe-vs-repair/)Three honest answers exist for old water pipe: fix the leak, replace the worst section, or replace the system. The leak history, the pipe material and what is planned for the house decide which one fits.
- Decision Guide [PEX vs copper repiping: which fits your house?](https://slaterepipingcolumbus.com/guide/pex-vs-copper/)Both are allowed by the Ohio Plumbing Code. The choice turns on the house: its access, its exposure to cold and sunlight, the budget, and how long the owner plans to stay.
- Learn [Does homeowners insurance cover repiping?](https://slaterepipingcolumbus.com/guide/homeowners-insurance-repiping/)How policies usually separate sudden water damage from wear and slow leaks, why replacing old pipe is treated as maintenance, what to photograph and keep after a leak, and where to take a question about your own policy.
- Learn [How invasive is repiping a house?](https://slaterepipingcolumbus.com/guide/how-invasive-is-repiping/)Where the openings go and why, how plaster and drywall differ, how dust is kept in one room, what to clear out beforehand, and the scope question that decides who closes every hole.

## How a repipe runs

1. First call Describe the houseIts age, the pipe you can see in the basement, the leaks so far and which floors lose pressure.
2. Walk through Map and scopeMains, branches, shutoffs and fixtures traced from the meter; material, openings and permit agreed in writing.
3. Pipe day Replace and reconnectWater shut off in stages, new lines run, fixtures and the water heater reconnected.
4. Sign off Test, inspect, patchPressure test and flush, permit inspections, then the openings are closed.

## What this work looks like

New red and blue PEX lines run along the ceiling joists of a bright attic over loose insulation, in a Columbus house

Gloved hand pressing a moisture meter against a damp stain on a wall near the baseboard, in a Columbus house

Brass water meter with a round dial on a copper line low on a white basement wall, a shutoff valve before it, in an older Columbus home

Blue PEX line across a basement ceiling with a short repair section joined by brass couplings, in a Columbus house

## Slab leak repair questions

### How do I know if I have a slab leak?

Typical signs are a warm patch on a floor, the sound of running water with everything off, a water meter that keeps moving, damp or lifting flooring, and a water heater that runs more than usual. None of them proves a slab leak alone, so a meter test and isolation test come first.

### Is it better to reroute or repair a slab leak?

It depends on the pipe and the house. A direct repair suits one precisely located leak in otherwise sound pipe. A reroute avoids breaking the floor and abandons the leaking line, which makes more sense when the pipe is old or the leak is under finished flooring.

### Can a house with a basement have a slab leak?

Yes. Many basement houses have a family room, kitchen, sunroom or garage conversion added on a concrete slab, with supply lines running under it. A leak under that addition behaves like a slab leak even though the rest of the house has a basement.

### Does a slab leak damage the foundation?

A long-running leak can wash out soil under a slab and contribute to settling or cracking, which is one reason not to leave one running. Whether it has done so is a question for a foundation professional, not something a plumbing repair can confirm.

## Related services

### Water leak detection

Hidden supply leaks narrowed down with meter, pressure and isolation tests before any wall or floor is opened, with a clear account of what the tests show and what they cannot.

### Partial repiping

One section of the water supply replaced, such as the hot side, a bath group, a floor or the basement main, with the boundary and the old pipe that stays written into the scope.

### Whole-house repiping

Every hot and cold supply line from the main shutoff to the fixtures, replaced in PEX or copper, pressure tested and inspected under a City or suburban plumbing permit.