Leak Detection in California
Plumbers find hidden leaks by isolating sections of plumbing and testing them, then pinpointing the spot with acoustic listening, thermal imaging and moisture meters — so only a small, targeted opening is needed for the repair.
Coverage in California
Covered ZIP codes
1,473
Cities and towns
917
Most-covered
Los Angeles, San Diego, San Francisco
What drives leak detection calls in California
Dry season: Long dry months shrink some soils, and irrigation systems, backflow devices and outdoor lines get heavy use.
Pre-war homes in Los Angeles, San Francisco and Oakland often have galvanized supply lines and cast-iron or clay drains. Slab-on-grade construction is common in Southern California and the Central Valley, while raised foundations are typical in older coastal neighborhoods.
Hiring for leak detection in California
Plumbing contractors in California must hold a Contractors State License Board (CSLB) license with the C-36 Plumbing classification for most work over the small-job threshold. Look up the license number on the CSLB site before hiring. Local building departments issue permits and inspect the work.
SteadWell is a free referral service, not a plumbing company. Calls to (833) 753-0180 are routed by ZIP code to independent, licensed plumbers; our California coverage list includes 1,473 ZIP codes. Ask for the trip fee and total price before work starts.
About leak detection
- Water bill up with no change in use
- Water meter moving with every fixture off
- Damp or stained drywall, ceiling spots
- Warm spot on a slab floor
- Sound of running water when nothing is on
The full guide covers the visit and cost factors: Leak Detection.
Leak Detection in California: questions
How do I check a plumber's license in California?
Plumbing contractors in California must hold a Contractors State License Board (CSLB) license with the C-36 Plumbing classification for most work over the small-job threshold. Look up the license number on the CSLB site before hiring. Local building departments issue permits and inspect the work.
Is leak detection available in Los Angeles?
Los Angeles is among the most-covered cities in our California call-routing list. Calls are connected by ZIP code to an independent, licensed plumber who serves it; if none does, you're told so.
How do I test for a hidden leak?
Turn off every fixture and appliance, note the meter, and check again after 30 minutes without using water. If it moved, there's a leak. Close the house shutoff and check again; if it still moves, the leak is on the service line.