Summary: Seattle Public Utilities (SPU) has limited options and restrictive requirements for allowing property owners, builders and developers to construct new and/or modify existing structures over an existing public sewer and/or storm drain mainline through a build-over agreement. This is due to the long term obligations SPU has to its stakeholders toward repairing, maintaining and upgrading the City of Seattleā€™s public sewer and storm drainage mainline infrastructure.

Date Revised: 02/03/2023

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