Sewer Repair for Magnolia and Seattle Homes
When a sewer line fails, the first job is figuring out where and why. Is it a clog, a root intrusion, a cracked joint, a sag, or pipe that has simply worn out? Each needs a different fix. Magnolia Plumbing & Sewer is based at 4027 W Bertona St in Magnolia and works on sewer lines across the neighborhood and nearby Seattle.
In ZIP code 98199, about half of all housing units (49.8%) were built before 1960, according to Census estimates. Sewer pipes that old were often laid in concrete or clay. That is the kind of pipe the City says is most at risk from roots and wear.
Based in Magnolia at 4027 W Bertona St, Seattle
Signs your sewer line needs repair, not just cleaning
A single clog that clears and stays clear is a cleaning job. These patterns point to a pipe problem:
- The same main-line clog comes back within months, often at about the same distance down the line.
- Several fixtures gurgle or drain slowly at once, especially the lowest ones (basement floor drain, lower-level shower or toilet).
- Sewage or dirty water comes up a floor drain or the lowest fixture after heavy rain or laundry.
- A camera shows roots, a cracked or offset joint, a sag that holds water, or a hole.
- A soft or sunken spot in the yard along the sewer route. SPU notes that holes and severe offset joints can wash soil into the pipe and leave voids that can become sinkholes.
Source: SPU: Side sewer defects and issues.
What actually goes wrong in older Seattle sewer pipe
SPU's defect guide describes the problems it sees in Seattle side sewers. Roots are common, and older concrete and clay pipe built without watertight joints is especially at risk. Exposed aggregate happens when the inside wall of a concrete pipe erodes until the rocks show through. SPU calls it "a common and critical defect", and says severe cases with holes should be replaced as soon as they're found.
Sags are another problem. A side sewer is built at a slope of about ¼ inch per foot, and SPU grades sags by how much of the pipe diameter they hold. Under 25% is minor; 50% or more is severe. Offset joints and cracks are graded from "routine inspection" to "repair".
That grading matters. Not every defect a camera finds needs digging right away, and a good inspection report should say which category each one falls in.
Source: SPU: Side sewer defects and issues.
Repair options, from smallest to largest
SPU describes four general repair types. Two or more are often combined on the same line:
- Spot repair: dig at one location and replace a short section, for a single offset joint, a collapse, or roots that can’t be cleared another way.
- Open-cut replacement: dig up and replace a long run when defects are spread through multiple sections. This disturbs the surface the most.
- Pipe bursting: pull a new pipe through the old one from an access pit at each end. See trenchless sewer repair.
- Cured-in-place lining (CIPP): a resin-soaked liner is cured inside the old pipe to form a seamless new pipe, which can help keep roots out.
Source: SPU: Side sewer repair methods.
Talk to us about sewer repair
Call 206-593-3737, or send us a request online and we’ll get back to you.
Permits, inspections and the City’s part
Seattle Public Utilities issues side sewer permits; it took over from SDCI on October 1, 2025. A repair permit is needed any time a pipe or an exterior fixture such as a cleanout is repaired or replaced. SPU says it processes repair permits by the end of the next business day. A City inspector looks at the work before the pipe is covered and again at the end (how to apply; repair steps).
If the work reaches the street or sidewalk, it also needs an SDOT right-of-way permit. Seattle code says work in a public place must be done by a registered side sewer contractor (SDOT FAQ; SMC 21.16.055).
If a contractor suspects the blockage is in the public main or in the City's part of the connection, call SPU at (206) 386-1800. SPU may check the main, and it repairs the main if it is damaged or obstructed (SPU backups).
How a sewer repair visit should go
- If the line is blocked, it gets cleared first. SPU points out that cameras can’t see under water, so inspection is most useful after the line is open.
- A camera inspection locates each defect by footage and depth, and the spot is marked on the ground.
- You get the cause and location in writing, and a copy of the video. SPU recommends asking for both.
- Repair options are explained side by side (spot repair, lining, bursting, replacement) before work is scheduled.
- The permit is pulled, the City inspects, and the trench and surface are restored.
Source: SPU: Side sewer repair methods.
Help paying for a side sewer repair
SPU mentions interest-free loans for side sewer repairs for qualifying low- and fixed-income customers. The Seattle Office of Housing offers Home Repair Loans for qualifying owner-occupied single-family homes. SPU also recommends getting at least three written bids (SPU side sewer; SPU repair methods).
How a job works
- Call or send a request. Tell us what’s happening. If water or sewage is coming up, we’ll walk you through stopping it first.
- Find the cause. Clear the line or open the access, then look: a camera for sewers, a test for leaks and water heaters.
- Options in plain English. What we found, where it is, and the repair choices. You decide before work starts.
- Permit, work, inspection. Where Seattle requires a permit (SPU for side sewers, Public Health for plumbing), the work is permitted and inspected.
Sewer Repair: common questions
Who is responsible for the sewer line between my house and the street in Seattle?
The property owner. SPU says the entire side sewer, all the way to the connection to the public main, is owned and maintained by the property owner. That includes roots up to and within the connection. The pipe inside the building is plumbing and is permitted by Public Health – Seattle & King County.
Do I need a permit to repair my sewer line in Seattle?
Yes, for repairs. SPU says permits are always required to repair a side sewer, on private property and in the right-of-way. Root removal and unclogging don’t need one. Work in the street also needs an SDOT permit.
Will cutting down my tree fix the root problem?
Probably not. SPU notes that a tree’s roots can grow up to twice the tree’s height and recommends keeping established trees. Regular scoping and cleaning, or a repair that seals the joints, is the usual answer.
Can a sewer camera see what’s blocking my line?
Usually not while the line is full of water. SPU says cameras can’t see under water and are most useful after the blockage has been cleared.
Where we offer sewer repair
- Magnolia: our home neighborhood (98199).
- Queen Anne: 26% of 98119 housing units were built before 1940
- Interbay: homes on the Magnolia and Queen Anne hillsides above Interbay
- Ballard: from pre-1940 bungalows in 98117 to newer 98107 townhomes
- Fremont: a third of 98103 housing predates 1940
Homeowner guides
- Seattle Side Sewer Permits: What Homeowners Need to Know: Ownership, permits, fees, inspections and contractor rules, all in one place.
Related services
- Side Sewer Repair & Replacement: Repair or replace the private sewer pipe from your house to the City main, permitted through SPU.
- Sewer Camera Inspection: See inside your side sewer: roots, cracks, sags and offsets, and what the video and findings should show.
- Trenchless Sewer Repair: Replace or reline a sewer pipe with less digging, where the pipe and site allow it.
- Hydro Jetting: High-pressure water cleaning for grease, sludge and roots, and to prepare a pipe for lining.
Get help with sewer repair
Call 206-593-3737, or send us a request online and we’ll get back to you.