San Bruno Sewer Lateral Inspection: What Home Sellers and Buyers Should Know

If you are selling a home in San Bruno, there is one requirement that catches many owners off guard: the point-of-sale sewer lateral inspection. It can add time and cost to a sale, and if the lateral fails, it can lead to sewage backups long before you ever list the house. This guide explains the rule in plain language, what it means for owners, and how it connects to the sewage backups our crews clean up.

Do you need a sewer lateral inspection to sell a home in San Bruno?

Yes. San Bruno requires a sewer lateral inspection when a property is sold. If the lateral is defective, it must be repaired or replaced, and the owner covers the cost.

The city began enforcing this point-of-sale requirement on May 8, 2015. It is part of San Bruno's effort to reduce sewage overflows and stop rainwater and groundwater from leaking into the sewer system through cracked private pipes. Always check the City of San Bruno Public Works page for the current process and forms before you list.

What Is a Sewer Lateral?

A sewer lateral is the private pipe that carries wastewater from your house to the public sewer main, usually under the street. Everything from your toilets, sinks, showers and washing machine flows through it. In San Bruno, the property owner is responsible for maintaining, repairing and replacing the private lateral.

In older homes, laterals are often:

• Clay pipe, which cracks and lets roots in at the joints
• Cast iron, which corrodes and develops holes over time
• Orangeburg or other early materials that deform and collapse

Many San Bruno homes were built in the 1940s through the 1960s, so a large share of laterals in the city are now 60 or more years old.

How the Point-of-Sale Process Generally Works

The exact steps come from the city, but the process usually looks like this:

• The lateral is inspected, typically with a video camera run through the pipe from a cleanout
• The video is reviewed for cracks, roots, offset joints, sags and breaks
• If the lateral passes, the owner receives documentation of compliance
• If it fails, the lateral must be repaired or replaced before or as part of the sale
• In some cases, the city allows a time extension with a deposit placed in escrow so the work can be finished after closing

The city's code notes that owners remain responsible for the full cost of compliance, which may be more than any escrow deposit. Buyers and sellers usually negotiate who pays as part of the sale.

How Much Does Sewer Lateral Work Cost?

Costs vary widely with the length of the lateral, its depth, whether it runs under a driveway or tree, and the repair method. A simple spot repair costs far less than a full replacement. Trenchless methods such as pipe bursting or lining can reduce digging but are not right for every pipe. Get written quotes from more than one plumbing contractor, and ask exactly what each quote includes, such as permits, cleanouts and surface restoration.

Why a Bad Lateral Matters Even If You Are Not Selling

A defective lateral is not just a paperwork problem. It is one of the most common causes of sewage backups in San Bruno homes. Roots grow into cracks, catch paper and debris, and eventually block the line. When that happens, wastewater has nowhere to go and comes back up through the lowest drain in the house: a basement floor drain, a ground-floor shower or a toilet.

Warning signs of a failing lateral:

• Gurgling toilets or drains
• Several fixtures draining slowly at the same time
• Water backing up in a shower when the washing machine drains
• Sewer odors in the house or yard
• Unusually green or soggy patches in the yard above the line

If you see these signs, have the line inspected before it backs up.

What to Do If Sewage Backs Up Into Your Home

• Stop using water in the house: no flushing, laundry or showers
• Keep everyone, especially children and pets, away from the area
• Do not touch sewage with bare hands
• Turn off power to the area if you can reach the panel safely
• Call a plumber to clear the line
• Call (650) 822-6798 for cleanup

Sewage is Category 3 water. Carpet, pad, drywall and other porous materials it touched need to be removed, and everything else must be cleaned and disinfected before drying. Details on how that works are on the sewage backup cleanup page.

Backwater Valves: A Simple Layer of Protection

A backwater valve lets wastewater flow out of the house but stops it from flowing back in. If your home sits low, has had backups before, or has a basement or ground-floor drains, ask your plumber whether a backwater valve makes sense when the lateral is repaired or replaced.

Tips for Sellers

• Schedule the lateral inspection early so a failed result does not delay closing
• Keep copies of the video and report
• Get more than one quote for any repair
• Talk to your agent about how the work and costs will be handled in the sale

Tips for Buyers

• Ask for the lateral inspection video and report
• Confirm whether repairs are done before closing or handled with an escrow deposit
• Ask whether the home has had past sewage backups and how they were cleaned up
• Look for signs of past water damage in the lowest floor, crawl space or basement

Frequently Asked Questions

Need Help After a Sewage Backup?

If a failing lateral has already sent sewage into your home, call (650) 822-6798. A crew is dispatched immediately to clean up, disinfect and dry the area. Learn more about sewage backup cleanup in San Bruno.

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