Sewer backup and sewer line repair: laterals, cleanouts and cost

For Silicon Valley homes · Updated October 2026 · Sources below

The sewer lateral is the pipe that carries everything from your house to the public sewer main in the street. The private part is the owner's to maintain, and where your responsibility ends differs by city. A camera inspection shows whether the line needs cleaning, a spot repair or a full replacement.

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Sewage backing up into the house? Stop using all water (no flushing, showers or laundry), keep children and pets away from it, and call a plumber.

The short version

Sewage coming up in a tub, shower or floor drain is urgent - stop using water
The lateral from your house toward the street is generally the owner's to maintain; the city maintains the main
A camera inspection shows roots, cracks and sags before you pay for a fix
Typical sewer line replacement: about $1,388 - $5,323 (national)
Some cities, like Morgan Hill, require a lateral inspection before you sell

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What it costs

Replace a sewer line$1,388 - $5,323
Fix a broken or cracked sewer pipe$600 - $1,050

Length, depth, trenchless vs. digging, and city permits drive the price.

Typical ranges from published cost guides - mostly national figures. Bay Area prices usually run higher. Your actual price depends on your home and the job, and a pro gives you the real number. Source: HomeAdvisor cost guide (national) (Jun 2026). Have a quote? Check it with the Quote Explainer

Signs of a sewer line problem

Several drains are slow or back up at the same time
Water comes up in the tub or shower when you flush
Gurgling toilets or drains
Sewage smell inside or in the yard
Clogs that keep coming back after being cleared

Clean, repair or replace?

Clean: roots or grease with no structural damage - a plumber can clear the line, but expect it to come back if roots are getting in.
Spot repair: one cracked or broken section in otherwise sound pipe.
Replace: pipe that is collapsed, badly offset or broken in several places, or old pipe with repeated problems.
Ask for the camera video and the location and depth of the problem - it tells you whether it's on your side and whether trenchless work is possible.
Replacing sewer pipe needs a permit, and work in the sidewalk or street usually needs city approval too.

In Silicon Valley

San José: an approved wye cleanout gives access to the lateral at the surface and should be within five feet of the sidewalk. Single-family owners can install one with a permit, hire a contractor, or have the City install it. When the City installs it, it repairs the lateral from the cleanout to the main, but not the part between the house and the cleanout.
Morgan Hill: private sewer lines from the building to the public main are owned and maintained by the property owner. Before selling a property more than 15 years old, owners must have the lateral inspected by camera and get a Certificate of Compliance, which is good for ten years.
City of Santa Clara: grease is a common cause of blocked laterals and backups. If you have a property-line cleanout and sewage backs up, the City asks you to call it first.

Questions homeowners ask

What is a sewer lateral, and who is responsible for it?

It's the pipe that connects your house to the public sewer main. In Morgan Hill, for example, the private line from the building to the main is the owner's to maintain. Where the city's part starts - at the main, at a property-line cleanout or elsewhere - differs by city, so check with yours.

Sewage is backing up into my house. What do I do?

Stop using water right away: no flushing, showers, dishwasher or laundry. Keep people and pets away from the sewage and call a plumber. If you have a cleanout at the property line, your city may check its side first - Santa Clara asks you to call the City.

How much does it cost to repair or replace a sewer line?

National cost guides put fixing a cracked or broken sewer pipe at about $600 to $1,050 and replacing a sewer line at about $1,388 to $5,323. Bay Area prices usually run higher, and length, depth, trenchless vs. digging, and city permits drive the final number.

Do I need a sewer lateral inspection to sell my house?

In some cities, yes. Morgan Hill requires a camera inspection and a Certificate of Compliance before selling a property more than 15 years old. Rules differ by city, so ask your city or your agent early in the sale.

What is a sewer cleanout?

A capped pipe that gives a plumber access to the lateral from outside. San José's approved wye cleanout sits within five feet of the sidewalk and points toward the city main, which makes clearing and inspecting the line easier.

What causes sewer line problems?

Common causes are tree roots getting into joints, grease building up, and old pipe that cracks, sags or shifts. A camera inspection shows which one you have before you pay for a repair.

Do you need a permit?

Small repairs usually don't; replacing pipes does.

General guidance based on California's building code - your city can have stricter rules, and zoning, historic and HOA rules can apply too. Check with your city's building department before you start.

Check the rule for your city

Questions to ask the pro

Can I get a copy of the camera video?
Where exactly is the problem, and is it on my side or the city's?
Is trenchless repair possible here, and what does it cost vs. digging?
Are the permit, sidewalk and landscaping restoration in the price?
How long is the repair or new line warrantied?

Before you sign, check the contractor's license at cslb.ca.gov. How to hire a contractor in California

Know a neighbor dealing with this?

Send them this page - it's free, and every answer has its sources.

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