SPU describes the property owner as owning the side sewer to the public main.
DOWNTOWN SEATTLE / GUIDE
Seattle Side Sewer Boundary
Shared-route records, side-sewer cards, permits, videos, and SPU findings can refine the property-specific picture.
PRACTICAL GUIDE
Separate the side sewer from the public main
Place interior plumbing, building drain, private side sewer, connection, shared segments, and public main on one evidence map.
A backup location alone does not decide which segment is blocked.
Check shared-route records
Start with the address, available side-sewer cards, permits, camera files, locate notes, easements, shared agreements, and the exact segment discussed by a provider. A general ownership statement does not resolve an unverified connection, shared route, or observed backup at one property.
Keep public and private findings under separate labels.