A slab leak is a broken water line under your concrete foundation. Watch for hot spots on the floor, a water bill that climbs for no reason, the sound of running water with everything off, or cracks in flooring. We confirm it with acoustic listening and thermal imaging, then fix it with a spot repair, a reroute, or a repipe.
The signs, in the order we check them
When a Citrus Heights homeowner calls about a possible slab leak, we walk through the same checklist every time. Check yours against it:
- The water bill climbs with no change in use. This is the number one first sign. If your Citrus Heights Water District bill jumps and nobody changed their habits, something is leaking.
- A hot spot on the floor. A patch of tile or concrete that feels warmer than the rest of the room. Hot-water line leaks announce themselves this way.
- The sound of running water with everything off. Stand in a quiet room. A hiss or flow sound under the floor means pressurized water is escaping.
- Cracks in flooring, or flooring that feels damp. Water under the slab pushes up. Tile cracks, laminate buckles, carpet stays damp in one area.
- Low water pressure at fixtures. A break in the line bleeds off pressure before it reaches your faucets.
- A musty smell near the floor. Moisture trapped under flooring grows musty fast.
Two or more of these together, and it's time to confirm. Not guess.
Watch for a hot spot on floor tiles or a warm patch that stays warm all day. That points to a hot line under the slab. Foundation cracks that run in a line across tiles, a soft floor that gives underfoot, warped flooring near a wall, or puddling water with no spill to explain it all point the same way. A sub-slab leak can also show up as mold growth in a corner, a mildew odor you cannot trace, or running water sounds late at night when every fixture is off. A structural crack in a wall or a slab edge that keeps growing after rain is worth a meter test before it gets worse.
How we pinpoint it: the hot-spot method
Finding a slab leak is a two-instrument job. Here's exactly what happens on a diagnosis visit:
First, we map the lines. A line locator sends a small current through the water line, and a receiver above the slab traces where the pipe runs and how deep it sits. Now we know where to listen.
Then we listen. An acoustic sensor on the slab picks up the sound of escaping water. It's not just volume. Different leaks have different frequencies and pitch, and comparing readings point by point walks us right to the break, often within inches.
Then we verify with thermal. A thermal camera shows the hot spot on the floor in color. When the acoustic pinpoint and the thermal hot spot agree, that's the leak. No guessing, no exploratory jackhammering.
Why this matters in Citrus Heights: most local homes are 1970s slab-on-grade with copper lines underneath, sitting on Fiddyment soils that swell and shrink over hardpan. That soil movement works copper joints for decades until one gives. Pinpointing first means the repair opens one small section of concrete. Not a trench across your living room.
Repair options: spot repair, reroute, or repipe
Once the leak is pinpointed, you have three real options. We'll tell you which one fits your situation. They are not all equal:
- Spot repair. Open the slab at the pinpoint, cut out the bad section, and repair that joint. Fastest and cheapest when the rest of the line is healthy and accessible.
- Reroute. Cap off the leaking underground line and run a brand-new line through the walls or ceiling to the same fixtures. No concrete broken at all. This is the move when the leak sits under an expensive floor, under a bathroom, or where digging would wreck the room. It's a permanent fix, not a patch.
- Full repipe. Replace the aging system outright. This is the honest recommendation when the house still has galvanized pipe from before the 1980s or failure-prone polybutylene from 1978–1995, because fixing one leak in a failing system just buys time until the next one.
We'll show you the line condition we found and recommend one option with the reason. Then it's your call.
Once the spot is marked, repair options are plain to compare. A spot repair opens only the marked area. A pipe reroute runs a new line through walls and skips the slab entirely. A direct access repair goes straight down through a small opening. A full pipe replacement swaps the whole run when the pipe is too far gone. Your plumber picks based on the pipe's age, the floor above it, and what the leak cost in water so far. We hand over the marked spot and the readings so that choice is made on facts.
When a slab leak is an emergency
Most slab leaks are urgent but not emergencies. Schedule the diagnosis this week, not this month. It becomes an emergency when water is actively flooding and you can't stop it at the shutoff, when flooring is buckling across a room, or when hot water is pouring and the water heater can't keep up. In those cases call (123) 456-7890 right away and shut the main valve at the meter box while you wait.
Frequently asked questions
Is a slab leak a big deal?
Yes. A pressurized line leaking under your foundation erodes soil, can crack the slab, and feeds mold under flooring. It also runs your water bill up every single day until it's fixed. The good news: once pinpointed with acoustic and thermal gear, most slab leaks are a one-day repair.
Do you have to break my floor to find a slab leak?
No. Finding the leak is completely non-invasive. Acoustic listening, thermal imaging, and line locating. Concrete only gets opened for the actual repair, and only at the pinpointed spot. If we recommend a reroute, no concrete gets broken at all.
Why do slab leaks happen so often in Citrus Heights?
Three local reasons stack up: most homes were built in the 1970s on slab-on-grade foundations, the water lines under those slabs are copper that has been worked by decades of soil movement, and Fiddyment soils here swell and shrink over hardpan, which flexes buried pipe until joints fail.
How long does slab leak repair take?
A spot repair or reroute is typically done in a day once the leak is pinpointed. A full repipe takes longer and we schedule it as a project. You'll get a straight timeline before any work starts.
Will my homeowners insurance cover a slab leak?
Often the resulting water damage is covered, while the pipe repair itself may not be. It depends on your policy and whether the leak was sudden or long-term. We provide a written, itemized diagnosis report you can hand straight to your adjuster.
Can I just ignore a small slab leak?
A small leak is still a pressurized leak. It doesn't stay small: it erodes soil under the slab, feeds mold, and the bill keeps climbing. Every month you wait, the repair gets bigger, not smaller.
Can a slab leak make doors and windows stick?
Yes, it can. Water under a slab can swell soil and shift the foundation enough to change how doors and windows close. Sticking doors alone do not prove a slab leak, as humidity and framing can also cause it, but sticking doors plus a high bill, warm floor or running water sounds point to a slab check.
Related
- Slab leak detection service
- Copper pipe repair in Citrus Heights
- Hidden water leak detection
- Underground water leak detection
- High water bill investigation
Think you have a leak?
Call AquaTrace Leak Detection to describe what you are seeing in Citrus Heights and get a plan to find it.
Call (123) 456-7890Last updated: October 25, 2026.