Leak Detection and Repair
Where leaks usually hide, why small ones get expensive, how plumbers find and fix them, and what that typically costs in Los Angeles and Orange County.
Quick answer
Typically $150 to $4,000
in Los Angeles and Orange County. Estimates, not quotes.
- Leak Detection Only$150 to $400
- Minor Leak Repair$150 to $350
- Pipe Leak Repair$250 to $650
Common Leak Locations
Under Sinks
Kitchen and bathroom sink leaks from supply lines, drain connections, or garbage disposals
Behind Walls
Hidden leaks in wall cavities often detected by water stains, bubbling paint, or musty odors
Ceilings
Water stains or dripping from above, often indicating leaks from upstairs plumbing or roof issues
Slab Foundations
Underground leaks beneath concrete slabs that can cause foundation damage if not addressed
Water Heaters
Tank corrosion, pressure relief valve issues, or supply line connections
Toilets
Wax ring failures, tank connections, or supply line leaks at the base or rear
Warning Signs of Hidden Leaks
Many leaks occur behind walls or under floors where they're not immediately visible. Watch for these signs that may indicate a hidden water leak:
Damage Caused by Ignoring Leaks
Structural Damage
Water weakens wood framing, drywall, and can compromise your home's structural integrity over time.
Mold Growth
Mold can begin growing within 24-48 hours of water exposure, creating health hazards and costly remediation.
Increased Utility Bills
Even small leaks waste thousands of gallons yearly, dramatically increasing your water costs.
Electrical Hazards
Water near electrical systems creates serious safety risks including shock and fire hazards.
How Leak Repairs Are Done
1. Diagnosis and Detection
Professional plumbers use specialized equipment including moisture meters, thermal imaging cameras, and acoustic listening devices to locate leaks precisely. Even behind walls or under slabs, they can do this without unnecessary damage to your home.
2. Assessment and Quote
Once the leak is located, the plumber assesses the extent of damage and explains your repair options. You'll receive a quote. Ask for it in writing before any work begins.
3. Repair
Repairs range from simple fixes like tightening connections or replacing washers, to pipe replacement or rerouting. The method depends on the leak's location, severity, and your pipe material.
4. Testing and Verification
After repair, the plumber tests the fix to ensure the leak is fully resolved and checks for any additional issues that might need attention.
What Does Leak Detection & Repair Cost?
Typical price ranges for leak detection & repair in Los Angeles County and Orange County. Actual cost depends on scope, access, and the condition of your existing plumbing.
| Type of work | Typical range |
|---|---|
| Leak Detection OnlyElectronic or acoustic leak detection to locate hidden leaks | $150 to $400 |
| Minor Leak RepairFixing a dripping faucet, leaking supply line, or toilet seal replacement | $150 to $350 |
| Pipe Leak RepairRepairing a leaking copper, PEX, or CPVC pipe section behind a wall or under a cabinet | $250 to $650 |
| Slab Leak RepairAccessing and repairing a leak under a concrete slab foundation | $1,500 to $4,000 |
After hours. Active leaks causing water damage are treated as emergencies with $75-$150 surcharge
Permits. Slab leak repairs and reroutes typically require a plumbing permit
Leak repair costs depend heavily on location and accessibility. Slab leaks and in-wall leaks cost more due to access requirements.
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