The first thing to know: stop using water in the house
Every gallon that goes down a drain is a gallon that has to come up somewhere. If the main sewer lateral is blocked, that "somewhere" is your lowest fixture — floor drain, first-floor tub, or basement toilet.
Before you do anything else: tell everyone in the house not to flush, not to run the dishwasher, not to take a shower, not to turn on the sprinklers.
Who to call
First call: your plumber. Not the restoration company. The restoration company cannot start until the sewage stops flowing, which means the plumber has to clear the blockage first. Call (831) 290-4327 for emergency sewer backup service.
Second call: your insurance company. Ask two questions: (1) Do I have a sewer backup or water backup endorsement on my policy? (2) What is your preferred remediation vendor list, or do I choose my own? Note the claim number and the adjuster's name.
Third call, if applicable: the city. If the blockage might be on the city side of the lateral tap, National City Public Works or San Diego County Sanitation may respond. Our camera work usually clarifies this within an hour.
What to save for insurance
Sewage backup claims live or die on documentation. Save:
- Photos of every affected surface before cleanup — floor, walls to at least 24 inches up, contents.
- Video walking through each affected room, narrating what you see. Timestamped.
- The failing fixture — do not throw the toilet away, in case the adjuster wants to inspect.
- Receipts for any temporary lodging, alternate meals, or replacement essentials.
- The plumber's invoice with cause of loss stated (root intrusion, Orangeburg collapse, city-side block).
- The camera footage of the lateral. We hand you the video file.
The Category 3 protocol
Sewage is IICRC Category 3 water — "grossly contaminated." Cleanup is not a mop-and-bleach job. Proper protocol includes:
- Extractors rated for pathogens (not household shop vacs)
- EPA-registered antimicrobial applied to all affected surfaces
- Removal and disposal of all porous materials that touched sewage — drywall bottom 12+ inches, carpet, pad, upholstery, insulation
- HEPA air scrubbers during removal
- Post-cleanup verification by a moisture meter and, on larger claims, an independent third-party hygienist
If your insurer is paying, they will insist on this protocol. If you are paying out of pocket, skipping steps risks family health and voids future coverage.
The insurance surprise
Standard California homeowners policies do not cover sewer backup by default. You have to have added a "sewer backup" or "water backup" endorsement, typically $40–$100 per year, which caps coverage at $10,000 or $25,000 in most policies.
If you are reading this post because you just had a backup and don't know if you have the endorsement, call your insurer right now and ask. If the answer is no, you can still file a claim for any resulting damage that falls under other perils (e.g., resulting damage to structural elements from the water event) — but the primary cleanup and remediation will likely be out of pocket.
If the answer is yes, verify the coverage limit and get the plumber's invoice, camera footage, and cleanup documentation to the adjuster fast.
If you don't have it and don't want a repeat surprise: add the endorsement. Now. It is one of the highest-value line items on a California homeowners policy for anyone in older housing stock. More detail on that in our California sewer insurance post.
Then: fix the underlying cause
The backup happened because of something. The camera tells us what. In greater San Diego County, the two most common causes we find:
- Orangeburg lateral collapse. Pre-1975 homes commonly still have Orangeburg — a wood-fiber pipe that deforms and collapses. If your camera footage shows an oval or partially crushed pipe, expect a pipe burst or CIPP replacement quote.
- Root intrusion at clay lateral joints. Roots enter open joints and grow into a mesh that catches waste. Cutting the roots buys 6–24 months. Lining or replacing the pipe is the permanent fix.
You can decline the follow-up repair — but you cannot ignore what the camera showed and expect the backup not to happen again.
The clean home comes back
Category 3 water is scary. Handled properly, it is also solvable. Ninety minutes to get the flow stopped, four to eight hours to extract and sanitize, one to three days of drying, and then either the affected drywall is patched or, on bigger events, the restoration company rebuilds. The home is normal again. The sewer question is answered. And you know why it happened.
Do not skip the camera. Do not skip the endorsement.