Short answer
For every building, keep a dated baseline camera video with a trace and depth sketch, the side sewer permit and any repair records, the shared-line agreement if one exists, a log of every cleaning with the cause found, and a one-page site sheet with cleanout locations and who to call. With those five things a backup is a dispatch, not an investigation, and a capital repair is a scheduled line item.
Why records are the whole game
A sewer backup at a rental is a tenant call at an inconvenient hour, a crew that needs to find the cleanout, and a decision about whether this is the third cleaning this year or the first. Without records every one of those is a fresh investigation. With records the call is a dispatch, the crew goes straight to the cleanout, and the decision is already made. The difference is a handful of documents that take one visit to create.
The five things to keep
1. A baseline video and trace
One full-length camera inspection per building, with the video file, a sketch of the route with depths, and the material by section. This is the reference every later event is compared against. For a pre-1980 building it is the single most useful document in the file.
2. Permits and repair records
The original side sewer permit (SDCI historically, Seattle Public Utilities since October 2025, or the suburban equivalent) and every repair permit since, with the contractor's post-work video. A line that was partly replaced in 2009 behaves differently from one that was not, and the next contractor should not have to guess.
3. The shared-line agreement
For townhomes, duplexes and any building sharing a lateral: the recorded maintenance agreement or the HOA declaration section that governs the shared section. Know the cost split and who can authorise work before the day you need to. The townhome article covers what it should say.
4. A cleaning log
Every cleaning: date, who, what was found (roots at 22 feet; grease; wipes), and whether a camera was run. Three entries that say "roots at 22 feet" are a lining job waiting to be scheduled. Three entries that say "wipes" are a tenant conversation. The log is what separates them.
5. A one-page site sheet
Cleanout locations with photos, route and depth, material, permit numbers, agreement reference, last cleaning and cause, and the contractor to call. Give it to whoever answers the phone at night.
From records to a capital plan
| Baseline shows | Plan |
|---|---|
| Sound line | No schedule; re-scope after any event |
| Roots at a few joints, round pipe | Annual cleaning as a bridge; budget lining within a few years |
| Orangeburg, concrete crown loss, multiple offsets | Budget replacement (usually bursting) now; do not wait for the failure |
| Belly under the driveway | Plan the spot repair with the next paving project |
| Shared line undocumented | Get an agreement recorded before there is a dispute to attach it to |
A note on tenants
Give tenants the one thing that matters: stop using water and call, in that order. A tenant who keeps running the washer during a backup turns a slow line into a flooded unit. A short line in the move-in packet covers it.
Portfolio scale
For a manager with a dozen or more buildings, the same records let you sort the portfolio: which lines are sound, which are on a cleaning bridge, which need capital work this year. That is a very different position from finding out one building at a time. We do baseline scopes for portfolios across Seattle and the Eastside; the inspection page is the place to start.
Questions people also ask
How often should rental sewer lines be scoped?
Once as a baseline for every pre-1980 building, then after any backup, before any paving or landscaping over the route, and every few years for lines with known root intrusion. Sound modern lines do not need a schedule.
Is a cleaning schedule a reasonable long-term plan?
For a line with a known, minor defect under open ground, sometimes. For anything else it is deferred capital work with an emergency premium attached. The baseline video tells you which.
Who is responsible in a rental — owner or tenant?
The side sewer is part of the building and the owner's responsibility. Tenant-caused blockages (wipes, grease) are a separate question; the camera usually shows the difference between a cause and a condition.
What should be in the site sheet?
Cleanout locations (photos), pipe route and depth from the trace, material by section, the shared-line agreement reference, the last cleaning date and cause, the permit numbers, and your sewer contractor's number.
More of the questions we hear every week are on the FAQ page .
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