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Large Water Service – 4-Inches and Larger
To apply for a new 4-inch or larger water service or change an existing water service, follow these steps:
- Apply for and receive an approved water availability certificate (WAC) (pdf).
- Submit the following:
- For additional water services (such as a short plat or unit lot subdivision), complete an addendum to add additional water service(s) (pdf) for each of the assigned legal addresses as assigned by the permitting agency. A separate application is not required for each address.
- Provide either a Seattle Department of Transportation Street Use Permit (51M) for pavement restoration, or a Street Improvement Plan (SIP) at 60 percent complete, showing restoration of water service related work.
- If outside of Seattle, SPU provides restoration costs except for the City of Shoreline.
- Once the water service application, utility site plan, and legal assigned legal addresses have been reviewed and any required corrections have been resolved, you will receive an invoice via email. Invoices are based on site-specific costs, which delays the invoice generation by approximately two weeks.
- Pay your invoice (see payment instructions on the second page of your invoice).
- To confirm compliance with Washington State Cross Connection and Backflow Prevention and Uniform Plumbing Code (pdf) requirements, you will need to:
- Call (206) 684-3536 with questions related to backflow protection before installation or to schedule a backflow inspection after installation.
- Call (206) 684-5800 to request an inspection of the underground water service lines on property after installation, but prior to covering.
Contact the SPU Development Service Office at firstname.lastname@example.org or (206) 684-3333 for assistance or to talk to your assigned project lead.
Other water service questions
How long will it take to get a water service?
Due to the unprecedented high volumes of construction in the Seattle area, it takes approximately 80 days for water service installation on nonarterial streets and 100 days for arterial streets, from the date payment is processed.
Please contact your Seattle Public Utilities project lead for more specifics on your installation timelines.
What size water pipe do I need?
Water service is based on the diameter of your water pipe, which is regulated by the 2012 Seattle Plumbing Code. The water service must be designed by a licensed mechanical engineer for 4-inch and larger water services.
- If a fire suppression system is required, the minimum size is a 1-inch diameter water pipe with a 1-inch meter. Please refer to Small Water Service - 2-inch and Smaller for fees.
Water service installation fees
|Meter size||Connection charge||Installation fee||Installation and connection total|
|Residential Street||Arterial Street||Residential Street||Arterial Street|
|4 inch||$18,071 +||Site specific||Site specific =||TBD||TBD|
|6 inch||$35,079 +||Site specific||Site specific =||TBD||TBD|
Requirements and costs for 4-inch or larger water service installation can vary significantly from site to site. Your costs will be determined by SPU field staff who will visit the site and provide job specific costs. This ensures your site-specific costs are more equitable, fair, and consistent. You can begin the process by submitting a water service application and agreement form (pdf) to SPU_DSO@seattle.gov.
If you require any water service work for which there are no standard charges developed, specific charges will be developed based on Director’s Rule FIN 210.2 (pdf).
SPU will provide you an invoice with site specific costs and additional fees. The invoice will be good for 365 days from the date it was issued to you.
A new request for costs will be needed if:
- Your invoice is not paid within the 365-day period
- You change the scope of the project after we provide project costs