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Council approves updates to Seattle Public Utilities system‑development charges, cost‑sharing and staffing
Summary
Seattle City Council approved a package of ordinances June 3 to revise system‑development charges for water, sewer and drainage, establish cost‑sharing mechanisms for mainline extensions and add staff to deliver the program, with measures to allow certain affordability deferrals.
On June 3 the Seattle City Council approved three related actions to update Seattle Public Utilities (SPU) policies and capacity for development-related infrastructure: Council Bill 120966 (revising and consolidating systems‑development charges for water, sewer and drainage), Council Bill 120967 (authorizing SPU to establish municipal assessment reimbursement areas and recoup cost‑sharing investments), and Council Bill 120968 (budget amendment to add staff and fund program work).
Sponsor Councilmember Andrew Hollingsworth said the package is intended to encourage development by enabling SPU to cost-share on expensive mainline extensions that currently block some projects. The change increases system development charges (SDCs) to create funding for those extensions and establishes a process for SPU to recoup investments from future benefiting developments. The 2025 budget amendment adds six positions at SPU to manage program administration and reimbursement.
Councilmember Maritza Rivera secured an amendment creating a deferral mechanism to protect certain homeowners and small projects: the council discussed and adopted language to allow deferment for projects that meet affordability criteria (for example owner-occupied accessory dwelling unit projects by households under an 80% area median income threshold), so charges would not immediately burden low- and moderate‑income residents pursuing modest infill or ADU construction.
Supporters said the policy would unlock properties that are undevelopable because of required mainline extensions, thereby increasing housing supply over time. The council passed the bills on roll-call votes with unanimous or near‑unanimous support; sponsors said SPU will develop processes to identify projects that benefit from prior mainline extensions and to collect reimbursement over time.
What the bills do and next steps: the SDC changes create new drainage and wastewater SDC categories, increase certain developer charges, and authorize SPU to structure municipal-assessment reimbursement areas to share costs with developers; SPU will implement rules and reporting and return to council with operational details as required. The new SPU positions will administer intake, agreements and reimbursements.
