Slab Leak Repair

What Causes Slab Leaks

A slab leak happens when a water line running underneath your home’s concrete foundation develops a leak. In Simi Valley, this is most often caused by copper pipe reacting with alkaline soil chemistry, creating pinhole corrosion over 30 to 50 years. Shifting soil, original construction defects, and abrasion from the pipe rubbing against gravel or rebar inside the slab also contribute.

Signs You May Have a Slab Leak

• A warm or wet spot on the floor with no obvious source
• Water bill spiking with no change in usage
• The sound of running water when every fixture is off
• Low water pressure throughout the house
• Cracks appearing in flooring or walls near the slab
• Mold or musty smell with no visible water source

How We Find and Fix a Slab Leak

An electronic listening device locates the precise sound of escaping water through the slab, narrowing the search to a specific area before any concrete is touched. Once confirmed, there are typically two repair paths:

• Spot repair: a small section of concrete is opened directly above the leak to access and repair the pipe — the least invasive option when the leak location is precise
• Reroute: a new pipe is routed through walls, ceilings, or attic space, bypassing the slab entirely — often a better choice for older homes with multiple corrosion-prone sections

What Slab Leak Repair Costs in Simi Valley

• Leak detection: $150–$400
• Spot repair: $500–$2,500 depending on slab depth and access
• Full reroute: $2,000–$6,000+ depending on home size and pipe run length

All costs confirmed in writing before any concrete is opened. For area-specific service, see our slab leak repair in Simi Valley page. Get a free slab leak repair cost estimate or a free plumbing repair cost estimate before your visit.