Signs to watch for
Signs you need leak detection
- The sound of running water inside a wall
- Mildew smell with no visible source
- Water bill jumped with no change in usage
- The water meter moves with every fixture closed
- A warm or damp patch on a floor slab
The job itself
How leak detection is done properly
Leak Detection & Repair is handled by independent licensed plumbers in California. This page covers what the work involves, what changes the price, and the California code and permit rules that apply. Published ranges are on the separate leak detection costs page. Locally, the biggest markets for it are Los Angeles, San Diego, San Jose. Requests for it often arrive alongside water heater installation & replacement.
- A meter test confirms whether water is being lost
- The system is isolated section by section to narrow the location
- Acoustic, thermal-imaging or tracer-gas equipment pinpoints the leak
- Minimum-access opening is made to expose the pipe
- The section is repaired and the system re-pressurized and re-tested
Price drivers
What drives leak detection pricing in California
- 01
Whether the leak is accessible or under slab, in a wall or under landscaping
- 02
Detection method needed — acoustic versus thermal versus tracer gas
- 03
Repair method — spot repair, reroute, or partial repipe
- 04
Restoration of the opened surface (concrete, tile, drywall)
- 05
Whether secondary water damage remediation is required
Scope boundary
What a standard visit covers — and what is billed on top
The single biggest source of quote disputes is the boundary between these two columns. Get it written down before work starts.
| Normally included | Commonly billed on top |
|---|---|
| Electronic or acoustic pinpointing and marking of the leak location | The repair itself, including rerouting a line around a failed slab section |
| A findings summary with the recommended repair approach explained | Drying, dehumidification and mold remediation handled by a restoration contractor |
| Meter test to confirm active water loss on the supply side | Cutting and patching drywall, tile or concrete to expose the pipe |
Local pages
Leak Detection by city in California
Each city page adds local ZIP coverage, permit authority and routing detail.
-
Los Angeles
Los Angeles County
-
San Diego
San Diego County
-
San Jose
Santa Clara County
-
San Francisco
San Francisco County
-
Fresno
Fresno County
-
Sacramento
Sacramento County
-
Long Beach
Los Angeles County
-
Oakland
Alameda County
-
Bakersfield
Kern County
-
Anaheim
Orange County
-
Riverside
Riverside County
-
Santa Ana
Orange County
Before you sign
Questions to ask before authorizing leak detection
- 01
Is the detection charge separate from the repair, and does it still apply if no leak is ultimately located?
- 02
How large an opening in floor, wall or slab is expected, because minimizing access limits the later restoration work?
- 03
For a slab leak, is a spot repair through the concrete or an overhead reroute proposed, and why that choice?
- 04
Will a written report with photographs and marked locations be provided, since insurers usually require proof of cause and position?
Before anyone touches a pipe
Verify the license. It takes two minutes.
- Who licenses the work: Contractors State License Board (CSLB).
- Who pulls the permit: the licensed contractor, never the homeowner.
- What to ask for: the license number, the registered name behind it, and an insurance certificate issued to the property address.
Answers first
Leak Detection in California — questions homeowners ask
How do I know if I have a hidden leak?
The simplest test: turn off every fixture and appliance that uses water, then watch the water meter's low-flow indicator for 15–20 minutes. Any movement means water is leaving the system somewhere. That test does not tell you where — it tells you that detection is worth paying for.
Is a slab leak an emergency?
It is urgent rather than instantaneous. A slab leak will keep eroding fill under the foundation and driving up the bill for as long as it runs, so it should be located quickly — but you generally have hours to days, not minutes, unless water is entering the living space.
Will detection damage my floor?
Modern detection is designed to avoid that: the point of acoustic, thermal and tracer-gas equipment is to make one small opening instead of several exploratory ones. Ask the contractor what restoration is and is not included before work starts.
Does calling create any obligation to hire?
None. A call or a callback request is a conversation, not a contract. Scope, timing and price are only agreed if you decide to proceed with the professional handling California.
Are night and weekend calls handled differently in California?
Requests route around the clock, but most contractors price after-hours work differently. Ask for the after-hours rate and a committed arrival window before agreeing to a dispatch.
What information speeds up a leak detection callback?
Three things: where the water or problem is showing, whether the supply is shut off, and the property type — slab, crawl space or basement. With those, a pro covering California can triage the urgency and bring the right parts.
How should a leak detection quote be compared?
Line by line against scope: what is included, what is excluded, who pulls the permit, and whether haul-away and restoration are inside the number. The cost guides on this site list published third-party ranges so any quote can be sanity-checked.
Who handles the permit for leak detection in California?
The licensed contractor pulls the permit — never the homeowner. If a contractor proposes skipping a required permit, treat that as the signal to stop and verify the license.
Get connected
Leak Detection in California
The form takes half a minute. It routes to an independent licensed pro covering California; everything else — scope, timing, price — you agree with them directly, license verified first.
- Requests handled around the clock
- An independent licensed pro calls you back
- No obligation to hire
Prefer a call back?
Quick form in, licensed pro's call back out.
Request received
It has been routed to an independent licensed professional covering your area — they will call you back on the number you entered.
Keep reading
See also
-
Cost guide
Leak Detection cost ranges in California
-
Services
All plumbing services
-
Licensing
California licensing and permits