Sewer backup: what to do first
A backup that returns after cabling is a sign the line may be damaged, not just blocked. The first steps are the same either way. Stop all water use, keep out of the water, and photograph the overflow for your insurer or landlord.
Shut off every drain.
No flushing, laundry or showers. Even a single load of washer water can reach a basement drain in minutes.
Stay clear of the spill.
Sewage carries bacteria. Keep children and pets out, and keep clear of outlets and appliances sitting in standing water.
Find the cleanout.
A capped pipe near the foundation or in the yard gives the camera and cable direct access. Do not open it if water is standing behind the cap.
Tell us what has been tried.
Share when it was last cabled, how far the cable reached, and where it stopped. That distance often marks the damage.
For a blockage that may clear with a cable, see our sewer line cleaning page. If the blockage returns within weeks, repair becomes the likelier answer.
When a sewer line problem is an emergency
Treat it as an emergency when sewage is coming up in a tub, shower or floor drain, when no toilet flushes, or when a sinkhole or wet patch appears over the sewer path in the yard. The 24/7 line is staffed through nights and weekends, and same-day appointments are available when the schedule allows.
An after-hours visit is usually about two things: getting the house usable again, and finding out why the line failed. We may clear the blockage first, run the camera, and then talk through the repair. Digging usually comes after the emergency is over, once you have a clear price.
A slow smell in the yard, a patch of unusually green grass or a sunken strip over the sewer path can wait for a booked visit. Do not wait if the house is backing up.
Signs the sewer line needs repair, not just cleaning
- Clogs return soon after cabling, sometimes within a few weeks.
- Toilets gurgle or several fixtures back up together.
- A sewer smell inside the house or in a crawlspace, with traps full of water.
- A sunken or soggy strip in the yard along the sewer path.
- Cracks or standing water seen on a camera image.
- A cable that stalls at the same spot each time.
None of these alone proves the pipe is broken. Together, they justify a camera look.
Pipe materials by housing era
The original plat east of SR 527 was built from 1976 to about 1983. Homes of this era often have cast iron or ABS drain lines inside, and older sewer laterals that are now over forty years old. Cast iron corrodes from the inside and cracks at joints, and ABS can sag if bedding was poor.
Homes built from the 2000s, such as those around Mill Creek Town Center, generally have newer plastic pipe. Failures there are more often a poorly seated joint or a section settled after construction. The Farm at Mill Creek, approved in 2019, is the newest and least likely to need sewer work.
We cannot identify your pipe from the street. A camera shows the material, the joints and the condition, and that decides which repair method makes sense.
Root intrusion in sewer laterals
Mature evergreen and broadleaf trees on many lots in the older subdivisions make roots a reasonable thing to check. Roots do not break a healthy pipe. They find a joint or crack that already leaks, enter, and thicken until the line closes.
Cutting roots with a cable or hydro jetting restores flow, but the gap remains. If the camera shows only one or two entry points, a spot repair can end the problem. If every joint is open, the line may need replacement.
Sagging runs and bellies
A sag, also called a belly, is a low section where the pipe has settled and holds water. Solids drop out there, and the line clogs again and again. A camera shows standing water that does not drain.
A belly cannot be cleaned out. Jetting empties it and the water comes back. The fix is to dig, regrade the bedding and replace that section. A short belly is a modest repair. A long one may point toward full lateral replacement.
Spot repair, replacement or trenchless lining
You may search for lateral replacement, trenchless sewer repair or pipe lining. These are three different ways to deal with the same damaged pipe. The camera decides which ones fit.
| Option | Best when | Trade-off |
|---|---|---|
| Spot repair | One cracked joint or a short failed section | Needs digging at that point and does not fix the rest of the pipe |
| Full lateral replacement | Widespread cracks, repeated failures or a long sag | Highest cost and most disruption, but a new pipe |
| Trenchless lining | A pipe with a clear path and moderate damage | Does not suit every pipe or every slab, and it reduces the diameter slightly |
| Pipe bursting | A replaceable straight run with access at each end | Needs entry pits, and not every route allows it |
| Cleaning and monitoring | A sound pipe with occasional roots | Does not fix the cause and the clog may return |
Lining means pulling a resin-coated sleeve through the old pipe and curing it in place. It avoids a trench in the yard, but it does not work in every pipe or under every slab. A collapsed section, a severe offset or a line with sharp bends may not accept it. We tell you plainly when digging is the better choice.
Washington's state plumbing code, chapter 51-56 of the Washington Administrative Code, is based on the Uniform Plumbing Code (UPC). Whether your job needs a permit or an inspection is a question for the building department that covers your address, because rules and local amendments vary.
What decides the price of sewer line repair
What moves the price of a sewer repair
We give you a clear price before work starts. Sewer work varies widely, so the factors matter more than any average.
Sudden damage to the home from a backup may be covered under some policies, while slow root or age damage to the pipe itself often is not. Read your policy or ask your insurer.
The line to a septic tank
Some properties in the wider area may be on septic. Septic tank pumping is not what this page covers. The line running from the house to the tank is, and it can crack, sag or fill with roots just like a city sewer lateral. If your home has a tank, tell the dispatcher so the visit is planned for the right system.
Before we arrive
- Locate the cleanout and clear the area around it.
- Call 811 before any digging of your own, since buried utilities cross many lots.
- Gather any past camera reports, repair records or sewer permits you have.
- Photograph the damage or the overflow.
- Note any trees, a driveway or structures over the sewer path.
We serve Mill Creek and nearby towns, including Bothell. If you are not sure what is wrong, begin with a sewer inspection.
Sewer line repair questions
How is sewer line repair priced?
You get a clear price before work starts. It depends on the depth and length of the damage, the repair method, what covers the pipe, access and permits, and what the camera shows.
Because sewer work varies so much, a camera look is usually the first step to a firm number.
Do you handle sewer line repair emergencies at night or on weekends in Mill Creek?
Yes. The 24/7 line is open at every hour and a sewage backup is treated as urgent. We often clear the line first so the house is usable, then camera it and discuss the repair.
We cannot promise an exact arrival time. Same-day appointments are available when the schedule allows.
Can every sewer line be lined without digging?
No. Lining needs a pipe that is open enough to accept the sleeve, with manageable bends and no severe collapse or offset. Some pipes under slabs cannot be lined.
The camera tells us whether lining is possible. If not, we explain the digging option.
Is a spot repair enough, or do I need the whole line replaced?
It depends on the camera. One failed joint in an otherwise sound pipe is a spot repair. Several cracks, a long belly or pipe at the end of its life usually point toward replacement.
Repair is wiser when the rest of the pipe is healthy. Replacement is wiser when repairs would only chase the next failure.
I searched for lateral replacement or trenchless sewer repair. Is that what I need?
Those are terms for replacing the pipe that runs from the house to the street or tank. Whether you need it depends on what the camera shows. A cracked or collapsed pipe may, a rooted but sound one may not.
Ask for a camera look first and decide after.
Are you doing septic tank pumping?
No. This page covers the sewer or septic line from the house to the tank or street, not pumping or tank service. Tell the dispatcher if you have a tank so we plan the right visit.
I am a landlord. Can I approve a sewer repair for a tenant property?
Yes. Give the dispatcher the address, your authorization and the tenant contact. We coordinate access and can share what the camera shows for your records.
I am buying a house and want to know if the sewer is sound. What should I do?
A camera inspection of the sewer line is the usual step. It shows cracks, roots, sags and the pipe material. Ask the dispatcher what documentation applies to your visit.
See our sewer inspection page for what it can and cannot show.