Slab Leak Repair
Copper lines under older slabs develop pinholes from hard water and soil movement, and the first clue is often a warm spot on the floor or a meter that keeps spinning.
See the detailsPlumbing repair for Mission Hills homes (91345)
Mission Hills sits in the north Valley where the 5 and the 405 come together, and its post-war houses keep us busy with slab leaks, tired water heaters and clay sewer laterals. Call us any hour.
Plumbing in Mission Hills, in short
Most Mission Hills calls involve hidden leaks in copper under slab floors, water heaters that need replacing or re-strapping, and older sewer laterals that roots have worked into. We find the source with listening gear, thermal imaging or a sewer camera, explain what we found and the typical cost, and do the repair once you say go.
How we cover Mission Hills
Mission Hills takes its name from Mission San Fernando Rey de España, the old adobe mission on San Fernando Mission Boulevard, and the neighborhood grew outward as farmland turned into housing after World War II. Most of what we work on today is single-family ranch houses on quiet residential streets, with apartments and small shops clustered along Sepulveda Boulevard and the bigger corridors.
The north Valley took a hard hit in the 1994 Northridge earthquake, and plenty of houses here had water heaters tip, gas connectors pull loose or pipes crack inside walls. Many repairs from that period were rushed. When we open a wall or crawl under a house in Mission Hills, we still find patched copper, mismatched fittings and heaters held by a single strap.
Homes and pipes
Ranch houses, slabs and old laterals in Mission Hills
- Post-war ranch houses on slabsMuch of the neighborhood went up from the late 1940s through the 1960s, largely on concrete slabs with copper or galvanized supply lines running under or through the floor.
- Clay and cast iron drainsHouses from that era usually drain through cast iron inside and a clay lateral out to the street, and both materials wear thin after six decades of use.
- Soils that swell and shrinkParts of the north Valley sit on clay soils that expand when wet and contract in dry months, which stresses slabs and the pipes cast inside them.
- Hard imported waterLADWP water here is hard, so scale collects in tank heaters, tankless units, faucet aerators and the cartridges inside shower valves.
What people call about
The plumbing calls we get most in Mission Hills
Water Heater Replacement
Many tanks here are past their service life, and a replacement has to go in with two seismic straps, a sound vent and an LADBS permit.
See the detailsMain Line Clog Clearing
Roots from mature yard trees find the joints in clay laterals, and a backup into the lowest tub or shower is a familiar call.
See the detailsSewer Camera Inspection
Buyers and long-time owners both want to know the condition of a sixty-year-old lateral before it fails, and the camera answers that quickly.
See the detailsSeismic Gas Shutoff Valve
Owners who lived through the 1994 quake often ask for an automatic valve at the meter so a strong shake cannot leave gas flowing into a damaged line.
See the detailsWhole-House Repiping
Galvanized supply lines that survived this long are usually narrowed by rust, which shows up as weak pressure and brown water after a few days away.
See the detailsPractical advice for Mission Hills homeowners
Start with the water heater, since it is the appliance most likely to cause damage in the next earthquake. Check that it has two straps, one in the upper third of the tank and one in the lower third, and that the gas connector is a flexible line rather than rigid pipe. Our guide on checking water heater straps walks through what to look for, and we can add or correct the bracing in a short visit.
If your water bill climbs without any change in habits, turn off every fixture and watch the meter at the street. A slowly turning leak indicator points to a hidden leak, often in the slab. We trace these with acoustic and thermal leak detection before cutting anything, and when one leak turns into several, rerouting the line through the attic or walls usually makes more sense than another floor repair.
Mission Hills shares much of its housing stock with Granada Hills to the west and the City of San Fernando to the northeast, so the same patterns repeat across the north Valley: older laterals, worn heaters and pipes under slab floors. Call the line any hour, including nights, weekends and holidays, and we will tell you what we see and what it typically costs before any work starts.
Questions we hear
Questions from Mission Hills
How do you find a slab leak in a Mission Hills house without tearing up the floor?
We start by confirming the leak at the meter, then isolate the hot and cold lines to see which one is losing water. Acoustic listening gear and a thermal camera narrow the spot to a small area. Most of the time we open a single section of floor, or we skip the slab entirely and reroute the line overhead.
Do I need a permit to replace a water heater in Mission Hills?
Yes. Mission Hills is part of the City of Los Angeles, so a water heater replacement goes through LADBS. The permit covers the straps, the venting, the gas connection and the temperature and pressure relief line. We handle the paperwork and meet the inspector, and the new tank goes in braced to state requirements.
Why does my Mission Hills main line keep clogging after it was cleared?
A cable can cut roots out of a clay lateral, but they grow back through the same cracked joints, often within a year or two. A camera inspection shows whether the pipe is offset, cracked or sagging. Limited damage can take a spot repair. If the whole line is failing, trenchless replacement ends the cycle.
Is a seismic gas shutoff valve worth adding to a Mission Hills home?
For many owners it is. The valve sits at the meter and closes by itself when it senses strong shaking, so gas stops flowing into lines that may have cracked. It does add a step after a quake, since the gas stays off until someone resets it and relights the pilots, but it removes a real fire risk in the minutes after a big shake.
Next door
Nearby areas we also cover
Granada Hills 91344
Sewer, water heater and slab leak repairs for Granada Hills ranch homes, Balboa Highlands modern houses and the hillside streets above.
Local detailsSan Fernando 91340
Sewer, drain and repipe work for the City of San Fernando's older bungalows and post-war houses, with water heater and gas service around the clock.
Local detailsNorth Hills 91343
Drain, water heater and repipe service for North Hills single-family homes and apartment buildings east of the 405 in the north Valley.
Local detailsPacoima 91331
Repipes, back-unit plumbing, sewer laterals and water heaters for Pacoima's postwar houses and the ADUs going in behind them.
Local detailsPlumbing trouble in Mission Hills?
One phone line, answered around the clock. Tell us the street and what you are seeing.