Seattle Public Utilities Mami Hara, General Manager/CEO

Development Services Office

Hours and location

Seattle Municipal Tower
700 Fifth Ave, 27th floor
Seattle, WA 98124

(206) 684-3333

Monday, Wednesday - Friday: 8:00 a.m. - 5:00 p.m.
Tuesday: 10:30 a.m. - 5:00 p.m.
Arrive before 4:00 p.m. for walk-in service

Who to contact during the project process (pdf)

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Make a payment

Online payments

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

Find the status of your water service taps project. You’ll need to use your project address or invoice number to search your project status. Who to contact during the project process (pdf).


Water and sewer research map

Use the DSO Water and Sewer Map to research existing Seattle water, drainage, and sewer infrastructure for new property purchases or development.


Tools and resources

Use our tools and resources to access forms, maps, records, and publications.


Other questions

Waterline inspections, backflow prevention or testing, billing questions:
(206) 684-5800

Resolving code and permit disputes