Payments and Contracts
Get cost estimation guides, required forms, documentation, and payment info for your project.
We regulate and approve new or changed water service within our system, including some Seattle suburbs.
Sewer and Drainage
Property owners and developers must tell us where stormwater, groundwater, and wastewater will go.
Collection and Disposal
Construction projects need to plan how they will salvage or dispose of solid waste during and after the build.
Land Surveys
We provide land survey services only to other City of Seattle departments, but we offer data for everyone to use.
Design Standards & Guidelines
Access manuals, design specifications, and guidelines to meet design and construction rules and requirements.


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You can contact the Development Services Office (DSO) at (206) 684-3333 or The mailing address for the DSO is:

Seattle Public Utilities - DSO
PO Box 94647
Seattle, WA 98124-4647

You can make a secure payment online to the Development Services Office using your 8-digit invoice number. Otherwise, you can mail in your payment.