By LE Construction · Published October 6, 2026
Many Ventura County homes built from the 1950s onward sit on concrete slabs with water lines running under or through them. When one of those pipes leaks, water spreads under the flooring, sometimes across several rooms, before anyone notices. Here is what to look for and what repair costs.
Signs of a slab leak
- A warm spot on the floor (hot water line).
- The sound of running water with all fixtures off.
- A water bill higher than usual.
- Damp, cupping or buckling flooring.
- A water meter that moves with everything turned off.
Published repair figures
HomeAdvisor’s 2025 cost guide puts slab leak repair at an average of $2,280, with most homeowners spending $630 to $4,400. That covers locating and fixing the pipe. It does not usually include drying the house or replacing the flooring, drywall and baseboards the water damaged.
Repair options
Spot repair
The plumber cuts into the slab at the leak, repairs the pipe and patches the concrete. It is direct, but it fixes one spot in a system that may be the same age everywhere.
Rerouting
New lines are run through walls, the attic or along the exterior, and the old line under the slab is abandoned. Rerouting avoids future slab leaks in that line and is common when a house has had more than one.
Repiping
When several leaks have occurred or the pipe is badly corroded, replacing the house’s supply lines may be the long-term fix.
The rebuild that follows
After a slab leak, the bigger cost is often what the water ruined:
- Flooring, especially wood, laminate or carpet, often across connected rooms so it matches.
- Baseboards and lower drywall where water wicked up.
- Cabinets if the leak was near the kitchen or a bathroom.
Drying has to be confirmed before new flooring goes down; flooring over a damp slab will fail.
Ventura County notes
Slab homes are common in Oxnard, Camarillo, Simi Valley, Moorpark and the Conejo Valley. Hard water across much of the county contributes to wear in plumbing. Many tract slabs are post-tensioned, so any cutting must be done after locating the cables.
See our water damage repair page and the guide to what water damage repair costs.
Frequently asked questions
What are the signs of a slab leak?
Warm spots on the floor, the sound of running water when nothing is on, an unexpectedly high water bill, damp or buckling flooring, and a water meter that moves with all fixtures off. A plumber can confirm with leak detection equipment.
Is it better to repair the slab leak or reroute the pipe?
It depends on the pipe's age and condition. Spot repair through the slab fixes one leak, but if the remaining pipe is the same age, more leaks may follow. Rerouting through walls or the attic avoids the slab entirely.
Does homeowners insurance cover slab leaks?
Policies vary. Some cover access to the pipe and resulting water damage but not the pipe repair itself. Read your policy and talk to your adjuster before work starts.
How long does the flooring rebuild take after a slab leak?
After drying, flooring and baseboard replacement across a few rooms usually takes days to a couple of weeks, depending on the material and how much area is affected.