Slab Leak Detection & Repair
Slab Leak Repair in LA & Orange County, California
Fanti Sewer & Drains locates and repairs slab leaks fast, using electronic leak detection instead of guesswork demolition. A leak under your slab can raise your water bill, damage flooring, and undermine your foundation the longer it runs — our licensed crews find the exact leak point and fix it with the least disruption to your home possible.
This service is a strong fit for homeowners noticing unexplained water bill spikes, warm spots on the floor, the sound of running water with all fixtures off, or visible cracks near the foundation.
Every line is inspected before we recommend spray lining. Pipes that are collapsed, badly displaced, or structurally compromised may need a different repair approach.
What Is a Slab Leak?
A slab leak is a leak in one of the water or sewer lines running underneath your home’s concrete foundation. Because these lines sit below the slab, a leak isn’t always obvious right away — it often shows up first as a higher water bill, a warm patch on the floor, or the sound of water running when nothing is turned on.
Our technicians use electronic leak detection equipment to pinpoint the exact location of the leak before any concrete is cut. That means we’re not guessing at where to dig — we’re repairing the actual problem in one targeted spot.
Whether it’s a pinhole leak in a copper supply line, a cracked joint under the kitchen, or a slow leak that’s been raising your bill for months, we scope the job, show you what we found, and give you a clear repair plan before we start.
Important Distinction
A slab leak isn’t just “a leak” — it’s a leak your foundation is sitting on top of. Left alone, it can lead to soil erosion under the slab, cracked flooring, mold growth, and foundation settling, which makes fast, accurate detection critical.
Depending on the cause and location, the right fix can range from a spot repair to re-routing the line entirely — we’ll walk you through the options that actually apply to your situation, not a one-size-fits-all answer.
Equipped to Find and Fix Slab Leaks Fast
Fanti Sewer & Drains carries electronic leak detection equipment, video inspection cameras, and the tools needed to complete most slab leak repairs without tearing up your entire floor.
Our crews come prepared to diagnose the leak on-site and, in most cases, complete the repair the same day it’s located.
We explain the repair options available for your specific leak — spot repair, re-piping, or rerouting — so you can make an informed decision before any work begins.
Electronic Leak Detection
Precise, non-invasive detection that locates the exact point of the leak before any concrete is opened.
Spot Repair
Targeted repair at the leak point for cases where a single small section of pipe needs to be replaced.
Pipe Re-Routing
Rerouting the water line above the slab or through walls to bypass a damaged section entirely, avoiding major concrete work.
Repiping
Full or partial repiping for homes with recurring leaks or aging pipe material that's likely to fail again.
Slab Leak Water Damage Assessment
Evaluation of flooring, subfloor, and surrounding areas affected by the leak, so nothing gets missed before repair.
Emergency Repairs
24/7 response for active slab leaks causing flooding or significant water loss.
Common Causes We Find
What Usually Causes a Slab Leak
Slab leaks develop for a handful of common reasons. Identifying the actual cause is part of how we decide the right repair, not just the fastest one.
Pipe Corrosion
Copper and galvanized lines corrode over time, especially in older homes, eventually creating small pinhole leaks.
Soil Shifting
Ground movement from settling, earthquakes, or expansive soil can put stress on pipes and cause cracks or joint failures.
High Water Pressure
Consistently high water pressure puts extra strain on pipe joints and connections, accelerating wear and leak risk.
Abrasion
Pipes that shift slightly against gravel, rebar, or the concrete itself can slowly wear through at the contact point.
Chemical Reaction
Certain soil conditions can react with pipe material over time, contributing to corrosion from the outside in.
Age of Plumbing
Homes with original plumbing from several decades ago are more likely to develop leaks simply due to material age.
Manufacturing Defects
In some cases, a leak traces back to a defect in the pipe itself rather than external wear or damage.
Poor Installation
Pipes installed too close together or without proper protection can rub against each other or the slab, wearing through over years.
Not every leak is a quick fix. Recurring leaks, widespread corrosion, or older galvanized systems may point to a bigger repiping conversation — we’ll tell you plainly if that’s what your home needs.
Our Process
How Fanti Sewer & Drains Handles Slab Leak Repair
We treat detection, diagnosis, repair, and verification as one connected job, not a rushed patch.
01
Initial Assessment & Scheduling
We start by understanding your symptoms — water bill spikes, sounds, warm spots, or visible damage — and schedule a visit, including emergency service when needed.
02
Electronic Leak Detection
Our technician uses electronic detection equipment to pinpoint the exact leak location without unnecessary demolition.
03
Diagnosis & Cause Review
We identify what's actually causing the leak — corrosion, soil movement, pressure, or age — not just where it's leaking.
04
Scope & Options Review
Before any concrete is opened, we walk you through what we found and the repair options that apply — spot repair, reroute, or repipe.
05
Access & Concrete Cutting
If a spot repair is needed, we cut the smallest section of slab necessary to reach the pipe directly.
06
Pipe Repair or Replacement
Our crew repairs or replaces the damaged section using materials suited to your home's plumbing system.
07
Pressure Testing
We pressure test the repaired line to confirm the leak is fully resolved before closing anything up.
08
Slab & Flooring Restoration
We patch the concrete and coordinate with you on flooring restoration where the repair required cutting through it.
09
Cleanup
Work areas are cleaned and restored, with attention to dust and debris control throughout the home.
10
Documentation & Follow-Up
We provide documentation of the leak location, cause, and repair performed, useful for insurance claims or your records.
FAQ’s
Your Questions About Slab Leak Repair
How do I know if I have a slab leak?
Common signs include an unexplained increase in your water bill, the sound of running water when everything’s off, warm spots on the floor, or visible cracks near the foundation. If you’re noticing any of these, it’s worth having it checked.
Do you have to cut through my entire floor to find the leak?
No. We use electronic leak detection to pinpoint the exact location first, so in most cases we only need to open a small, targeted section of slab.
Can a slab leak be repaired without repiping the whole house?
In many cases, yes — a spot repair or reroute can fix the issue. Repiping is typically only recommended when there’s a pattern of recurring leaks or widespread pipe corrosion.
Is slab leak repair covered by homeowners insurance?
Coverage varies by policy and cause. We provide documentation of the leak and repair that you can submit to your insurance provider for their determination.
How long does slab leak detection and repair take?
Detection is typically done the same day. Repair time depends on the scope, a straightforward spot repair can often be completed in a single visit.
Do you offer emergency slab leak service?
Yes, we provide 24/7 emergency response for active leaks causing significant water loss or flooding.
What causes most slab leaks?
Pipe corrosion, soil shifting, high water pressure, and simple age of the plumbing system are the most common causes we find.
Will you show me where the leak actually is before starting work?
Yes. We walk you through our detection findings and the repair plan before any concrete work begins.
Slab Leak Evaluation
Think You Might Have a Slab Leak?
Don’t wait for a small leak to turn into a bigger foundation or flooring problem. Fanti Sewer & Drains can locate the leak, walk you through what we find, and give you a clear, honest repair plan.