Who's Responsible for Your Sewer Line in La Palma?

By La Palma Plumber · October 16, 2026

Most homeowners assume the pipe under the street is the city's problem. Often, it isn't.

When the drains back up and a plumber says the problem is out near the street, the next question is almost always: "Isn't that the city's pipe?" The answer surprises a lot of people.

The parts of the system

• Your house drains - sinks, tubs, toilets and the pipes under the floor that collect everything.
• The sewer lateral - the single pipe that carries all of it from the house out to the public sewer.
• The sewer main - the large public pipe, usually under the street, that collects laterals from every house.

The general rule in Southern California

In most Southern California cities, the property owner is responsible for the sewer lateral - typically the entire length from the house to where it connects to the main, including the section under the sidewalk, parkway or street. The city or sanitation agency is responsible for the main itself.

That means if roots, a crack or a collapse in the lateral cause a backup, the repair is usually the homeowner's responsibility, even if the problem spot is under the public sidewalk.

Every city sets its own rules, so check with the City of La Palma's public works department for the specifics that apply to your property, including permits for any work in the public right-of-way.

Why it matters in La Palma

Most La Palma homes were built in the 1960s and 70s. Sewer laterals from that era were often clay or cast iron. After 50-plus years:

• Clay pipe joints can separate, letting in roots from parkway and yard trees
• Cast iron can corrode and crack
• Settling soil can create bellies - low spots where waste collects
• Ground movement can offset joints

Any of these can cause repeated backups that come back even after the line has been cleared.

Signs your lateral needs attention

• Several drains slow or backing up at once
• Water coming up in the tub or shower when the toilet is flushed
• Gurgling drains
• Sewer smells around the house or yard
• Clogs that come back again and again
• A soggy or unusually green patch of lawn over the line

Find out what's really going on

If backups keep returning, a camera inspection is the most useful step. A small camera is run through the lateral from a cleanout, showing roots, cracks, bellies or breaks - and exactly where they are, including whether the problem is on your property or near the main. That's what decides the right repair. See sewer line repair.

Know where your cleanout is

A sewer cleanout is a capped pipe, usually near the house or near the property line, that gives direct access to the lateral. Knowing where it is speeds up any emergency, because a plumber can clear the line from outside rather than pulling a toilet. If you can't find one, a plumber can help locate it, or recommend adding one.

Buying a home?

A sewer camera inspection before buying an older home is one of the most useful checks you can do. Problems with the lateral aren't visible in a normal walk-through, and repairs can be significant. Ask your inspector or a plumber to scope the line during your inspection period.

Keeping your lateral healthy

• Don't flush wipes - even "flushable" ones
• Keep grease out of the kitchen sink
• Think about where you plant trees in relation to the sewer line
• If roots have caused trouble before, ask about a lasting repair rather than repeated clearing