When a section of sewer pipe caves in, nothing gets past it. Here's how we confirm a collapse and get your line working again.
Written byNew Pro Plumbing·Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)·Last reviewedSeptember 2026 · 8 min readQuick Answer
A collapsed sewer line is a section of pipe that has caved in, cutting off or severely restricting flow. It usually causes backups that cleaning can't clear. Repair means replacing that section, by pipe bursting or a targeted excavation, after a camera confirms the location and extent. In Mar Vista, collapses usually happen in original clay laterals that roots have been working on for decades.
Sewer pipe collapses when it's weakened past the point of holding the soil above it. Old clay cracked by roots, cast iron thinned by corrosion, and fiber pipe that has softened can all give way, sometimes after years of warning signs, sometimes suddenly after heavy rain or nearby digging. This page is part of our complete guide to sewer line repair in Mar Vista.
Collapsed Sewer Line Repair: A collapsed sewer line is a section of sewer pipe that has caved in under soil load, blocking or severely restricting flow until it is replaced.
Once a section collapses, waste has nowhere to go. Drains back up, often into the lowest fixture first, and snaking or jetting may punch through briefly or not at all. The only real fix is replacing the collapsed section, and sometimes the aging line on either side of it.
In Mar Vista, collapses usually happen in original clay laterals that roots have been working on for decades. Mar Vista's root-damaged clay laterals are the most common place we find collapses.
If waste is backing up, we try to relieve it and protect the home first.
We locate the collapse, its depth, and its length.
Pipe bursting or a targeted dig, depending on the line and the site.
The section is replaced, tested, inspected, and restored.
Camera first, always. Every recommendation starts with a recorded inspection you can watch yourself, and a flat-rate price you approve before we start.
Most collapses we find in Mar Vista are in original clay laterals, and they rarely come out of nowhere. Usually there's a history: roots cleared every year or two, slow drains, maybe a backup after heavy rain. Eventually a cracked, root-packed section gives way, often near the parkway where street-tree roots are heaviest. When we get that call, the first job is relieving the backup. Then we camera and locate the collapse and plan the replacement. On many Mar Vista lots, bursting from two small pits replaces the collapsed section and the aging clay around it in one job.
Most Mar Vista homes went up between the 1920s and the 1950s, and a lot of them still drain through the sewer lateral they were built with. The hill streets add slope and longer runs, while the flats tend to have shallower laterals under driveways and parkways. You get a written scope that names the method, the footage, and what's included, so there's nothing to decode later.
Not sure what your line needs? We camera it first, then quote a flat rate.
Get a Free Quote| Detail | Mar Vista |
|---|---|
| Area | Mar Vista, CA 90066 |
| Jurisdiction | City of Los Angeles |
| Permits | LADBS (City of Los Angeles) |
| Typical access | A cleanout or fixture; targeted excavation only when needed |
| First step | Camera inspection with a copy of the recording |
| Pricing | Flat-rate, in writing, before work starts |
| Availability | 24/7, including weekends and holidays |
| License | CSLB #974600, insured |
| Languages | English and Spanish |
Mar Vista is inside the City of Los Angeles, so sewer work on private property is permitted and inspected through LADBS. Under LA Sanitation's rules, the property owner maintains and repairs the entire lateral, including the lower portion that runs under the parkway or street. You'll get copies of the permit and final inspection for your records.
Example scenario below is illustrative, based on common situations we see. Details vary by property; not a specific customer.
A Mar Vista family has sewage in the shower on a Sunday morning, and the drain cleaner can't get through.
We relieve the backup, then camera the line and find a collapsed clay section under the parkway; we burst and replace the lateral that week.
The home has a new jointless line, and the collapse is fixed without trenching the front yard.
New Pro Plumbing is family-owned and led by Miguel Lopez, and many Mar Vista customers ask for him by name. We explain your options in plain language, in English or Spanish, and let you decide. We'll tell you what can wait and what can't, and why.
Also serving neighborhoods near Mar Vista: Del Rey, Culver City, Westdale, Mar Vista Hill. See all Westside service areas.
The Bottom Line
A collapsed sewer line has to be replaced, not cleaned. We confirm it on camera, pinpoint it, and replace it by bursting or a targeted dig, whichever the site supports.
Backups that come right back after cleaning, or that won’t clear at all, are the main sign. A camera inspection confirms it by showing the caved-in section. A collapsed sewer stops flow completely and usually shows up as sewage backing up into the lowest fixture. See our collapsed sewer line repair page for immediate steps.
No. A liner needs a pipe to line. A collapsed section has to be replaced by bursting or excavation. You can’t line or burst a fully collapsed section from end to end; the head or liner needs a continuous pipe corridor. The fix is a targeted excavation at the collapse, then trenchless renewal of the rest of the run when it makes sense.
If sewage is backing up into the home, yes. Call us 24/7. We’ll work to stop the backup and plan the permanent repair. Collapses commonly happen at old clay joints that have offset over years of root pressure or soil movement. That is why we camera the rest of the line even after the immediate repair.
No. We locate the collapse precisely, so any excavation is limited to that section, or we replace it by bursting through small pits. If sewage has backed up inside the home, keep people and pets clear of the affected area and stop running water. See our sewage backup emergency page for what to do first.
Street-tree roots are often heaviest under the parkway, and years of root pressure crack and weaken the clay until a section gives way. For a Mar Vista clay collapse, we usually excavate the collapsed segment and consider lining or bursting the rest of the run. See Mar Vista sewer repair hub.
This page was written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Agency rules are summarized from the official sources above; programs and requirements can change, so confirm current details with the agency. Nothing here is a quote. We confirm scope and pricing in writing before any work begins.
What’s new: September 2026, first publication.
When a section of sewer pipe caves in, nothing gets past it. Here's how we confirm a collapse and get your line working again.
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