Why a pipe under the slab leaks
Pipes cast into or under a slab face friction, soil movement, and constant temperature swings. Copper can pit from the inside when water chemistry is aggressive, and a hot water line expands and contracts every time the heater cycles. Over years, a thin spot becomes a pinhole.
Altamonte Springs adds orthophosphate to its drinking water as corrosion control, according to the city's water page, which helps protect pipes. It does not stop physical wear, and bedding stones that rub a copper line can still cause a leak decades later.
Sounds, heat, and bills that give it away
These signs often show up before any water appears on the surface.
- A floor that feels warm in one spot, usually over a hot water line.
- The faint sound of running or hissing water in a silent house.
- A meter that keeps turning with every fixture and appliance off.
- Damp carpet edges, lifting laminate, or cracked grout lines.
- A musty smell near an interior wall with no clear source.
- Water heater that never seems to catch up or runs constantly.
- A bill that climbs month after month with no change in use.
Slab leak right now: what to do first
Shut the main valve at the meter or where the line enters the house. Then open one faucet at the lowest point to drain pressure, and watch the meter dial for a minute to confirm the flow has stopped. If the meter still turns, a different line is leaking or the valve is not closing fully.
Turn off the water heater if the leak is on a hot line, so the tank does not keep refilling and stressing the system. Gas heaters can be set to pilot or vacation mode, and electric ones can be switched off at the breaker.
How we pinpoint the leak without guessing
Acoustic sensors pressed to the slab pick up the sound water makes as it leaves a pipe under pressure. We trace along the likely line paths, compare readings, and then confirm with a pressure test on each isolated line. The result is a mark on the floor, not a broad area.
If the survey is not clear, a thermal camera helps on hot lines. Our leak detection page explains the full set of methods we bring, and it applies equally to slab work.
Why accuracy saves money
Opening concrete in the wrong spot adds cost and delay. A surveyed mark within three or four inches means a smaller hole, less dust, and a patch that matches the surrounding floor more easily.
Repair options compared
The right fix depends on how many leaks there are, how old the pipe is, and what is on top of the slab.
| Option | How it works | Best when |
|---|---|---|
| Spot repair | Cut a small opening, replace the damaged section, patch the concrete | One leak on otherwise sound pipe |
| Reroute | Abandon the leaking line and run new pipe through walls or the attic | Repeated leaks on one line or hard-to-reach floors |
| Repipe | Replace most or all supply lines with new copper or PEX | Several leaks, old pipe, or recurring pinholes |
| Epoxy lining | Coat the inside of the pipe to seal pinholes | Select cases, depends on pipe condition |
Ground conditions around Altamonte Springs
University of Florida extension notes that soils across North and Central Florida are typically very sandy. Sand drains fast and can shift when water washes it out, which is why a leaking line can undermine its own bedding. If you notice a hairline crack in a floor or a gap at a baseboard, mention it, because it helps us read where the leak may be.
The Florida Geological Survey says the whole state sits above carbonate rock, which is why sinkholes are a statewide concern. Sinkholes are not the usual cause of a slab leak, but if a floor or yard suddenly sinks, leave the area and call the city before calling us.
What drives slab leak repair cost
Slab work is priced by access and scope, because every home has a different floor and a different route for the lines.
| Work | Typical ballpark |
|---|---|
| Slab leak survey | $150 to $400 |
| Spot repair through the slab | $1,500 to $4,500 |
| Reroute through walls or attic | $2,500 to $6,500 |
| Whole-house repipe | Quoted per home, often several thousand more |
- Location of the leakA leak near a wall or closet is easier to reach than one in the middle of a finished living room.
- Floor coveringBare concrete patches quickly. Tile, hardwood, and built-in cabinets add removal and replacement work.
- Repair typeA spot repair is the smallest job. A reroute or repipe takes more material and more hours.
- TimingAfter-hours emergency visits are priced differently from a daytime appointment on the same day.
These are typical ballparks and they change with the job. The price is stated clearly before we start, and you decide which route makes sense.
Reroute or repipe: how to choose
Rerouting is attractive when the leaking line is the only problem and the walls are easy to open. It leaves the old pipe abandoned in the slab and avoids breaking concrete. A second leak on the same line, though, usually tips the balance toward a full repipe since the pipe is telling you it is near the end.
We also check water heater connections and the pressure regulator, because high pressure speeds up pinhole formation on any pipe. A reading above about 80 psi is worth correcting.
Limits, renters, and shared buildings
Altamonte Springs has 97 multifamily communities with 17,110 units according to the city, and the census data puts renters at roughly half the housing. If you rent, tell your property manager first, since slab and main line repairs are usually the owner's decision. We can still diagnose and explain what we find.
A slab leak that has damaged drywall, flooring, or insulation will also need a drying company, and your insurer may want photos and an invoice for the repair. We repair pipes, not subfloor drying. Anyone smelling gas should leave and call 911 first.
Water coming up through the floor now
Stop the supply
Close the main shutoff and confirm the meter dial stops. If the valve is stuck, call us and the city utility at once.
Keep off warm or wet flooring
Hot water leaking under a slab can scald, and wet tile is slippery. Move people and pets to a dry room.
Cut power if needed
Turn off breakers for any outlet near standing water, but only if you can reach the panel without stepping into water.
Document and dry
Take photos of damage, lift small rugs, and run fans to move air until we arrive.
Call (407) 964-8940 any hour, including weekends. We offer same-day appointments when available and after-hours dispatch for floors that are already flooding. The same crew and listening gear also work across Maitland.
Slab leak questions
Yes. The line at (407) 964-8940 runs around the clock. If water is surfacing or the meter is spinning fast, close the main valve and call, and we will set the earliest visit available, including nights and weekends.
Slab leaks often come with a warm patch on the floor, a hiss in a quiet house, or a meter that moves with everything off. A leak in a wall or ceiling usually leaves a visible stain.
Not always. A reroute through the attic or walls avoids concrete entirely. When a spot repair is the right call, we cut a small opening over the marked leak and patch it.
Policies differ. Many cover resulting water damage but not the pipe itself, so ask your insurer before work starts and keep the invoice and photos.
A spot repair often fits into a day. Reroutes take longer because new pipe runs through walls. We give a time range with the price before work begins.
For the meter or pipes before it, call Water Distribution at (407) 571-8340. Past the meter, the plumbing is yours, and we handle it.