Development Services Office
Hours and location
Seattle Municipal Tower
700 Fifth Ave, 27th floor
Seattle, WA 98124
(206) 684-3333
spu_dso@seattle.gov
Monday, Wednesday - Friday: 8:00 a.m. - 5:00 p.m.
Tuesday: 10:30 a.m. - 5:00 p.m.
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Make a payment
Mail-in payments:
Seattle Public Utilities - DSO
PO Box 94647
Seattle, WA 98124-4647
In-person payments:
Information & Payments desk
Seattle Municipal Tower
700 Fifth Ave, 4th floor (lobby entrance)
Seattle, WA 98124
The Development Services Office (DSO) assists and coaches developers and homeowners who are looking to obtain new water utility services within the Seattle Public Utilities service area. We ensure that new development in the public right-of-way conforms to applicable code requirements. We also partner with Seattle Department of Transportation to review and approve street use permits associated with drainage, wastewater, and water main extensions.
Taps Tracker
Learn about the status of your water service project. Please have your project address or invoice number ready to search your project status.
Water and sewer research map
Use the DSO's Water and Sewer Map to research existing Seattle water, drainage, and sewer infrastructure for new property purchases or development.
Other questions
Waterline inspections, backflow prevention or testing, billing questions:
(206) 684-5800
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