Main sewer line
Sewer Main Line Hydro Jetting in Los Angeles: Clearing the Line to the Street
Short answer: your sewer main line is the large pipe that carries everything from your house to the public sewer. When it clogs, several drains back up at once. Hydro jetting cleans the whole pipe wall with high-pressure water, and a camera shows the pipe before and after. We connect you with a local plumber who does it.
Signs it is the main line
- Several drains slow or backing up together
- Toilets gurgle when the washer drains
- Water or sewage coming up in the lowest drain
- Sewage smell or soggy patches in the yard
Stop running water, and do not flush.
What the sewer main line is
The main line, often called the sewer lateral, runs from the house to the public sewer main under the street or alley. Every fixture in the house drains into it.
That is why a clog here behaves differently from a sink clog. One blocked sink affects one sink. A blocked main line shows up in the toilets, tubs and floor drains, and the lowest drain in the house is usually the first to back up.
In the City of Los Angeles the private lateral is the property owner’s responsibility, and the public main under the street belongs to the city. See who is responsible for the sewer line.
Last updated October 2026.
Signs your main line is clogged
- Multiple drains slow or backing up at the same time.
- Gurgling in a toilet or tub when water runs elsewhere.
- Water coming up in a shower, tub or floor drain when you flush or run the washer.
- Sewage smell in the house or near the cleanout.
- A wet or unusually green patch in the yard along the line.
- Clogs that come back after a snake visit.
More in signs of a clogged sewer line. If water is coming up now, use the emergency steps.
What clogs a main line
| Cause | What it looks like | How it is usually handled |
|---|---|---|
| Grease and soap film | Slow build-up on the pipe wall, often from the kitchen | Hydro jetting to clean the wall |
| Tree roots | Roots enter through joints and form a mass that catches paper | Root-cutting nozzle or cutter, then a camera check |
| Wipes and paper products | A plug that forms in one spot | Clearing the line, and stopping the flushing of wipes |
| Scale and mineral build-up | A rough narrowing, common in older cast iron | Cleaning, then watching the camera |
| Broken or offset pipe | A low spot or shifted joint that holds waste | A camera finds it, and a repair fixes it |
Roots are covered in root removal hydro jetting.
Why a camera comes first
On a main line, a camera is not an upsell. It tells the plumber what the pipe is made of, where it bends, whether it has cracks and where the blockage is. It also tells you whether jetting is the right fix.
A pass afterward shows the cleaned line. Ask for the video so you can compare it with the next visit or use it in a repair quote. See sewer camera inspection.
How hydro jetting clears a main line
A jetting hose with a multi-jet nozzle goes in through the cleanout. Jets point backward and pull the hose along the pipe, and the spray scours grease, scale and roots off the wall as it passes.
Pressure depends on the line. One plumbing company states up to 4,000 psi for main lines and up to 1,400 psi for home secondary lines. A California sanitary district describes working a public sewer main at 1,200 to 1,500 psi on the way up and 700 to 900 psi on the way back, at 65 gallons per minute. Your plumber picks settings for your pipe.
Higher pressure is not always better. On fragile or old pipe, the plumber should start lower or check with a camera first.
What the visit looks like
- The plumber asks about symptoms and the age of the house.
- They find the cleanout, or explain the options if there is none.
- A camera goes in to see the pipe and the blockage.
- If the pipe can take it, the line is jetted with a nozzle suited to the blockage.
- A second camera pass shows the result.
- You get a written summary and advice on keeping the line clear.
Access: the cleanout makes it faster
A cleanout is a capped pipe that gives direct access to the line. Without one, the plumber may have to work through a roof vent or pull a toilet, which is slower and harder on the fixture.
Find yours with how to find your sewer cleanout, or ask about installing one.
Keeping the line clear afterward
- Do not flush wipes, even if the pack says flushable.
- Collect cooking grease in a can instead of pouring it down the drain.
- Keep large tree roots in mind and ask for a camera look if the line has clogged before.
- If the line clogged once from roots or grease, ask the plumber how often it should be checked. See how often to hydro jet.
What affects the price
Length and depth of the line, access, how much is in the pipe, and whether a camera pass is included all change the price. We do not publish a single number, because it would be a guess. You get a written price before any work starts. See the cost page for published market ranges.
Who does the work
Hydro Jetting Los Angeles is a referral service operated by Hydro Jet Pros LA. We are not the plumbing contractor. When you call or send a request, we pass it to Mike Anderson, a local plumber with 12+ years of experience. His team does the work, and you pay the plumber, not us. We speak English and Spanish, and hours are 7 AM to 9 PM.
Sources: Bonney Plumbing, hydro jetter; Oro Loma Sanitary District, hydro jetters.
Common questions
How do I know it is the main line and not one drain?
If more than one fixture is slow or backing up, it is probably the main line. A single slow sink is usually local.
Can I jet a main line without a camera?
It can be done, but a camera shows if the pipe is damaged and whether jetting is safe. We recommend it.
How long does main line jetting take?
Usually a few hours, depending on length, access and what is in the pipe.
Will it fix roots?
It clears roots from the line. The joint they came through is not sealed, so roots can regrow. See root removal.
Is the main line my responsibility?
The private lateral from your house to the public main is, in the City of Los Angeles. The public main belongs to the city.
What if the camera shows a cracked pipe?
Then cleaning is only temporary, and the plumber explains repair options and gives a written price.
Can hydro jetting damage the pipe?
On sound pipe it is a normal method. On weak or old pipe it needs care. Read can hydro jetting damage pipes.
What do I do if the line is backed up now?
Stop using water and see emergency sewer backup.
Main line backing up?
Call and tell us what you are seeing, and a local plumber will talk you through the next step.