Main line drain cleaning in Los Angeles

Main line drain cleaning clears the large pipe that carries all of the house's wastewater to the street. A cable machine or a jet goes in through the cleanout, removes the clog and restores flow. In Los Angeles, clearing a main line typically costs about $250 to $600 with a cable and $350 to $900 with a jet.

If your problem is only one slow fixture, you do not have a main line clog: start with shower drain or sink drain help instead. Everything else on this page assumes the whole house is affected. Our home page lists the other services.

How do I know the main sewer line is clogged?

The main line is clogged when more than one drain is slow, a toilet gurgles when something else drains, or sewage rises in the lowest tub, shower or floor drain in the house. A single slow sink points to a branch, not the main. Look for the pattern across fixtures.

A fast test: flush the toilet farthest from the bathroom and run the kitchen sink at the same time. If the lowest shower or tub gurgles or fills, the main is blocked. Water finds the lowest opening first, so ground-floor and garage drains show the problem first.

Other clues are a sewer smell near the cleanout cap and a clog that returns within weeks of being cleared. That second one means roots, a bellied pipe or a crack, not a one-off blockage.

What should I do in the first hour of a sewer backup?

Stop using water, keep people and pets out of the affected room and photograph the damage for any insurance claim. Do not flush, run the washing machine or pour in chemicals. Call a plumber to clear the main, then ask about cleanup. Sewage carries bacteria, so wear gloves and boots if you must go in.

Then work out whose pipe it is:

1. Check the street. If a manhole is overflowing, or neighbors report the same backup, the public main may be involved. In the City of Los Angeles, 311 is the starting point. In unincorporated areas, LA County Public Works runs a 24-hour sewer line at 800-675-4357.
2. If only your house is affected, the blockage is almost always in your lateral, which you own.
3. Call a plumber to clear it, and keep the camera footage.

For fixture-level steps after the line is clear, emergency sewer backup walks through cleanup and smells.

Do plumbers clean out drains?

Yes. Plumbers clear main lines through a cleanout, a pipe with a cap that gives direct access to the sewer lateral, usually in the yard or beside the house. They use a cable machine with a cutting head for roots and soft clogs, or a jet for grease and scale, and often a camera to confirm the cause.

No cleanout means the plumber has to pull a toilet or go through the roof vent, which takes longer and costs more. Installing a cleanout during the visit is common and worthwhile. See cleaning a sewer cleanout for what the access point looks like.

What is the best way to clean out a main sewer line?

A cable with a root-cutting head clears most clogs, and a hydro jet is the better tool for grease and scale. A camera afterward confirms the line is clear and shows why it clogged. If it clogs again within months, the pipe has a defect that needs repair, not another cleaning.

Match the tool to the cause:

Tree roots and poured fats, oils and grease cause more than half of sewer backups in Los Angeles, according to LA Sanitation, so those are the first suspects.

Does main line cleaner really work, and what is the best chemical?

Main line cleaner products rarely clear a real main line clog. They are made for a short run of pipe and cannot reach a lateral that may be 40 feet or longer. Caustic products can also burn skin and eyes, and they sit in the pipe, which is dangerous to the plumber who comes next.

If you have tried one already, tell the plumber. Never mix cleaners, because mixing can release toxic gas. Foaming root killer products are a slower, separate treatment, covered in foaming root killer, and they are not an emergency fix. The best way to unclog a main sewer line is mechanical: a cable or a jet.

Can I replace or unclog the main sewer line myself?

You can try to clear a clog yourself if the cleanout is accessible and you have the right cable and a means of cleaning up afterward, but many people stop after a few feet. Replacing the main line is not a DIY job: it needs a permit, excavation and a contractor with the right license.

California requires a contractor license for plumbing work that needs a permit or reaches the state's dollar threshold, and the City of Los Angeles requires a permit for sewer replacement. For the repair side, see sewer line repair.

How much does main line drain cleaning cost?

Main line clearing with a cable typically runs $250 to $600 in Los Angeles, and with a jet $350 to $900. A camera inspection adds about $150 to $350 when it is billed separately. After-hours and weekend visits often cost more. Heavy roots can raise the total. These are published local ranges, and your written quote after a visit sets the price.

What changes it:

• A cleanout versus no cleanout.
• The length and depth of the lateral.
• Cause: paper is cheap, roots and scale cost more.
• Time of call: night and holiday premiums.

A fuller breakdown is on the main sewer line clog cost page.

Does insurance cover a sewer backup?

Standard homeowners and renters policies typically exclude sewer and drain backup unless you added a water backup endorsement, and even then limits are often modest. If the failure was in the city main, damage claims usually go to the agency. Read your policy and call the insurer before any cleanup.

Unpermitted or neglected pipe can complicate a claim. Keep the invoice and the camera footage. If a landlord's pipe is at fault, the lease and local housing rules apply, which is a question for the landlord or a tenant advocate rather than a plumber.

For a clog that is already affecting your home, use the price request page. The page allows you to schedule service online, and the quote is in writing after the visit.

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Questions people ask

What is the strongest cleaner for a main drain line?

Mechanical clearing is stronger than any bottle. A root cutter or a jet physically removes the blockage, while chemicals dissolve only part of it and can harm old pipe or burn skin. If one product fails, do not add a second one on top, and tell the plumber what you used.

Can you unclog a main sewer line yourself?

Sometimes, if there is a cleanout and the clog is soft. Rented cables often stop at the first bend or at roots. If water backs up again within days, a plumber with a larger cutter or a jet is the right call.

Does a sink drain need a cleanout?

Not normally. Fixtures use traps and branch lines you can clear from the fixture. A cleanout belongs on the main sewer line, near the house or at the property line, so that the whole lateral can be reached without removing a toilet.

What is a sewage cleaner called?

Cleanup products for sewage are disinfectants and enzyme or bacteria-based cleaners, not drain openers. They treat the surfaces and the smell after a backup. A drain opener will not fix a blocked sewer line and does nothing for the flooded floor.

Can I sue the city for a sewer backup?

If the cause was in the city main, you can usually file a claim with the agency, and that claim has deadlines. We are not a law firm, so contact the city or a lawyer for the process. Get a plumber to confirm in writing where the blockage was.