Slab Leak Repair in California

Slab Leak Repair across California: the 1,921 ZIP codes and 726 cities we route calls in, and who licenses plumbers in the state.

Call (888) 706-0205

Pipe emerging from a hole cut in a stone wall

Free to homeowners in California — the contractor pays us for the introduction, you never do.

Reroute or break the slab

Our slab leak repair coverage in California runs to 1,921 ZIP codes in 726 cities. Slab-on-grade construction and large municipalities go together, and where a city has grown quickly the supply lines under the floor are often the same age across whole neighborhoods — which is why one street can produce several calls in a season.

Source: coverage area as published by our call partner; place and county names from the US Census Bureau.

We route slab leak repair calls in 1,921 ZIP codes across 726 California cities, in 40 counties.

What this site is

UnderSlab is a referral service, not a contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands, and work that opens a structural slab is normally permitted — ask to see the permit. We carry out no work and no leak detection, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call.

Checking a credential in California

California licenses are issued by the Contractors State License Board, which publishes a public search you can use before work begins. California licenses the C-36 plumbing contractor; there is no state journeyman license.

21 of the 40 California counties we cover, beyond the largest few

Amador County 8 ZIP codes
Amador City, Drytown, Ione, Jackson, Pine Grove, Pioneer, Plymouth, Sutter Creek
Butte County 19 ZIP codes
Chico, Oroville, Paradise, Bangor, Biggs, Durham, Forest Ranch, Gridley, Magalia, Nelson, Palermo, Richvale
Calaveras County 8 ZIP codes
Angels Camp, Burson, Campo Seco, Copperopolis, Mokelumne Hill, San Andreas, Valley Springs, Wallace
Colusa County 3 ZIP codes
Colusa, Maxwell, Princeton
El Dorado County 17 ZIP codes
Camino, Coloma, Cool, Diamond Springs, El Dorado, El Dorado Hills, Garden Valley, Georgetown, Greenwood, Lotus, Pilot Hill, Placerville, Pollock Pines and 4 more
Fresno County 13 ZIP codes
Fresno, Clovis
Glenn County 6 ZIP codes
Artois, Butte City, Glenn, Hamilton City, Orland, Willows
Kern County 12 ZIP codes
Boron, California City, Cantil, Edwards, Inyokern, Keene, Maricopa, Mojave, Randsburg, Ridgecrest, Rosamond, Tehachapi
Merced County 13 ZIP codes
Merced, Atwater, Delhi, Gustine, Hilmar, Livingston, Los Banos, Snelling, Winton
Monterey County 21 ZIP codes
Salinas, Monterey, Carmel, Aromas, Carmel by the Sea, Castroville, Marina, Moss Landing, Pacific Grove, Pebble Beach, Seaside
Napa County 12 ZIP codes
Napa, American Canyon, Angwin, Calistoga, Deer Park, Oakville, Pope Valley, Rutherford, Saint Helena, Yountville
Nevada County 1 ZIP code
Truckee
Placer County 20 ZIP codes
Auburn, Roseville, Rocklin, Carnelian Bay, Foresthill, Granite Bay, Kings Beach, Lincoln, Loomis, Meadow Vista, Newcastle, Olympic Valley, Penryn and 2 more
San Benito County 1 ZIP code
San Juan Bautista
Santa Cruz County 20 ZIP codes
Santa Cruz, Aptos, Watsonville, Ben Lomond, Boulder Creek, Brookdale, Capitola, Davenport, Felton, Freedom, Mount Hermon, Scotts Valley, Soquel
Solano County 16 ZIP codes
Vallejo, Vacaville, Fairfield, Benicia, Birds Landing, Dixon, Elmira, Rio Vista, Suisun City, Travis AFB
Sutter County 9 ZIP codes
Yuba City, Live Oak, Nicolaus, Pleasant Grove, Rio Oso, Robbins, Sutter
Tehama County 7 ZIP codes
Corning, Gerber, Los Molinos, Proberta, Red Bluff, Tehama, Vina
Tuolumne County 2 ZIP codes
La Grange, Sonora
Yolo County 20 ZIP codes
West Sacramento, Davis, Woodland, Brooks, Capay, Clarksburg, Dunnigan, Esparto, Guinda, Knights Landing, Madison, Winters, Yolo and 1 more
Yuba County 5 ZIP codes
Beale AFB, Marysville, Olivehurst, Rackerby, Wheatland

19 more California counties are inside the coverage area and are not listed here. If your ZIP code is in California, the call reaches a contractor.

What that coverage looks like

We cover 1,921 ZIP codes in California across 40 counties, Los Angeles County accounting for 494 of them. What is under the floor varies with all of that: a slab in one county and a basement in the next, and the same symptom means a different job in each.

How a slab leak repair job goes

A slab leak is located first and repaired second, and the second decision is between rerouting the run overhead and breaking the floor to reach it. Rerouting leaves the floor intact and abandons the old line in place; breaking through is the shorter job where the leak is near an edge and the floor covering is replaceable. Both are reasonable; they are not interchangeable.

What the call asks about slab leak repair

Whether there is a warm patch on the floor, or the sound of water with everything off.
Whether the meter moves with the house shut off at the main.
What the floor is — tile, carpet, wood, polished concrete — because it decides the cost of reaching the pipe.

Every California city we route in

405 cities, ordered by the share of housing that is detached houses. Slab construction and building density move together, and a slab is what makes a leak expensive. Each page carries that city’s own numbers and the ZIP codes we route there.

Before you call

A slab leak is either rerouted overhead or reached through the floor, and the choice is made before anything is broken. The pages above set out both.

Drainage pipework laid out on a sub-base before the concrete is poured

Reinforcing steel cage with pipework run through it before a pour