If the repair is yours to pay
Get more than one quote before you agree to a price, and ask the contractor to confirm where the property line and the public side begin.
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Default rule and exceptions
Owner-owned pipe (Seattle Public Utilities calls it the "side sewer") runs from the building to the point where it connects to the public sewer main. SPU owns only the public sewer pipe.
| Party | What they are responsible for |
|---|---|
| Property owner | Maintain and repair the entire side sewer from the building to its connection with the public sewer pipe. |
| City / public agency | Seattle Public Utilities owns and maintains the public sewer pipe. |
| Exceptions | None on record |
What the source says
Last verified against the primary source on Sep 11, 2026.
If you own your home or building, you own your side sewer until it connects to the public sewer pipe.
A "side sewer" carries wastewater from a building's sinks, toilets and drains to the public sewer.
City rules rest on state law. Read Washington's sidewalk statute, quoted verbatim, or see all 50 states in one table.
Common questions
Who pays for sewer lateral in Seattle, WA?
The property owner. Maintain and repair the entire side sewer from the building to its connection with the public sewer pipe.
What does the city cover in Seattle, WA?
Seattle Public Utilities owns and maintains the public sewer pipe.
What is this based on for Seattle, WA?
This verdict is sourced to Side Sewer Maintenance: you own your side sewer to the public sewer pipe and 2 sources in total, each independently re-checked before publication.
Sources
- Side Sewer Maintenance: you own your side sewer to the public sewer pipeofficial · verified-primary · accessed 2026-09-11
- Side Sewer Maintenance: definition of "side sewer"official · verified-primary · accessed 2026-09-11
Spot an error? Challenge this record
Found an out-of-date code section, a wrong verdict, or a better primary source? Tell us. Corrections that check out are applied, with the change shown in history. That is our standing policy.