Sewer Leak Detection
A bad smell near the yard, a drain that gurgles for no reason, or one stretch of lawn that stays soggier and greener than the rest usually means the sewer line underneath has a problem. Our sewer team locates the break in the line and shows you exactly what caused it, without tearing up the whole yard to look for it.
Signs Something’s Wrong With Your Sewer Line
Sewer leaks are easy to miss at first because the line runs underground, out of sight, between your house and the street. Watch for these instead.
A sulfur or rotten-egg smell drifts up near the yard or a floor drain, even when nothing’s backed up yet. One stretch of the yard stays noticeably damper and greener than everywhere else around it. Drains gurgle or drain slower than they used to, especially the lowest fixtures in the house. Small cracks appear in a nearby walkway or slab as the ground underneath shifts from saturation. You notice more ants, roaches, or rodents than usual, drawn in by moisture and waste odor.
Any one of these could mean something minor. Two or three together, especially the smell and the soggy patch, usually mean the lateral line itself has a break.
Older South Bay neighborhoods, including tracts built through the fifties and sixties, often still run on their original clay or cast iron sewer laterals. Clay pipe develops hairline cracks at the joints over decades, and cast iron corrodes from the inside as waste flows through it year after year. Tree roots make it worse, working into any small gap in search of moisture and eventually splitting the pipe wide open.
Why Root Intrusion Is Such A Common Culprit
Roots don’t cause the first crack, but they take full advantage of one. A hairline gap at a pipe joint releases just enough moisture into the surrounding soil to attract nearby roots, which then grow into the opening and widen it over months or years. By the time you notice slow drains, a root mass may already be partially blocking the line in addition to the leak itself.
Along with sewer leak detection, our Torrance team also handles pool leak detection, slab leak detection, and leak repair. Whatever the source of your water loss, we pinpoint it accurately before any digging or repair begins — see all our leak detection services.
How We Find It
Camera Inspection
A waterproof camera goes directly into the line through an existing cleanout, showing us cracks, root intrusion, offset joints, and bellies in real time on a monitor. This is usually the fastest way to confirm both the location and cause of a sewer leak.
Smoke Testing
Non-toxic smoke gets forced into the line and escapes through any crack or break, showing up aboveground so we can pinpoint the exact spot without digging test holes.
Hydrostatic Pressure Testing
The line gets sealed and filled with water under pressure. A drop in pressure confirms a leak exists and roughly where along the run it’s located, useful when camera access is limited.
Dye Verification
A dye tablet flushed through a fixture confirms which drain line connects to a suspect area of the yard, helpful when more than one line runs through the same section of property.
Common Places Sewer Leaks Start
The Lateral Line Under The Yard
The run between your house and the city connection is the longest stretch of pipe and the most exposed to root intrusion and ground movement.
Pipe Joints And Connections
Older clay pipe sections are joined every few feet, and each joint is a potential weak point as the ground settles over time.
Around The Cleanout
The fitting itself can crack or loosen, especially older cleanouts that have been driven over or paved near.
Where Roots Have Intruded
Any point a root has broken through tends to keep widening unless the section gets repaired or lined.
Repair Options
A small joint crack or minor root intrusion often gets handled with trenchless pipe lining, which seals the inside of the existing pipe without excavating the yard. A localized break can sometimes be fixed with a spot repair, opening a short section rather than the whole run. Severely cracked or collapsed sections may need pipe bursting, which pulls a new pipe through the old one’s path. Widespread damage across an old clay line occasionally calls for traditional excavation and full replacement, though this is the least common outcome once a camera has actually confirmed the extent of the damage.
The Real Cost Of Letting A Sewer Leak Sit
A slow sewer leak doesn’t just smell bad. Waste-contaminated soil around a leaking lateral can work its way toward a foundation, a fence line, or a neighboring property, and repeated backups from a partially blocked, leaking line put more strain on the rest of your plumbing system with every flush. What starts as a joint that needs sealing can turn into a full section replacement if roots are given enough time to keep working into the crack.
There’s a cost side too. Camera inspection and a trenchless fix now is almost always less disruptive and less expensive than an emergency dig after a full backup floods a bathroom or laundry room.
Permits And Who Should Be Doing This Work
Sewer lateral repairs often require a permit from the city, particularly when the work extends into the public right-of-way near the street connection. A licensed contractor handles that paperwork as part of the job rather than leaving it to you to sort out afterward. Ask to see their license number before work starts, and confirm it covers sewer and drain work specifically, since not every plumbing license automatically includes lateral line repair.
What A Sewer Inspection Visit Looks Like
1. What You’ve Noticed
We ask what you’ve noticed, whether it’s odor, slow drains, or a damp spot outside.
2. Camera Run
We run a camera through the nearest cleanout to look at the full run of pipe.
3. Cause Identified
We identify the cause, whether that’s a cracked joint, root intrusion, or a bellied section holding standing water.
4. Footage Review
We play back the footage on the spot and explain what repair option fits the damage we found.
5. The Fix
We schedule the fix, whether that’s a same-visit trenchless line or a follow-up for a larger repair.
Sewer Leaks We’ve Found In The South Bay
Roots Through A Clay Joint
A home near a mature street tree had a lateral line partially blocked by roots that had grown through a cracked clay joint. Camera inspection confirmed the exact spot, and the section got relined without disturbing the driveway above it.
A Bellied Section
A property with recurring slow drains turned out to have a bellied section of pipe holding wastewater between uses. Once identified on camera, the low spot was corrected with a localized repair instead of replacing the full run.
A Hairline Crack, Nine Feet Down
A backyard with a persistently soggy corner, despite no sprinklers nearby, traced back to a hairline crack in the lateral nine feet down. Smoke testing found it in under an hour.
Where We Handle Sewer Leak Detection
Our crew covers sewer lateral inspections and repairs throughout the South Bay.
Common Questions About Sewer Leaks
What South Bay homeowners tend to ask before scheduling a sewer inspection.
Schedule A Sewer Inspection (424) 699-0818