Plumbing Code

See also: Side Sewer Code

The target 2021 Seattle Code implementation date of July 1, 2023, is delayed to no sooner than early 2024 as SDCI continues through the City’s ordinance process for adopting updates to our Codes. SDCI started accepting applications using the 2021 Washington Codes on July 1, if they are accompanied by a code modification request. Please visit the 2021 Seattle Code Adoption webpage for updates.

What Is It?

The Seattle Plumbing Code regulates design, installation, and maintenance of plumbing systems and fixtures. The 2018 Washington State Plumbing Code with Seattle amendments is in effect in Seattle. The Seattle Plumbing Code is enforced by Public Health - Seattle & King County.

Read the Code

This is a read-only version of the 2018 Seattle Plumbing Code. You can buy a full version from the IAMPO Online Store, or by calling (909) 472-4208. 

This is a read-only version of the 2015 Seattle Plumbing Code. You can buy a full version from the IAMPO Online Store, or by calling (909) 472-4208. Print copies are available for sale in our Public Resource Center.

This is a read-only version of the 2012 Seattle Plumbing Code. You can buy a full version from the IAMPO Online Store, or by calling (909) 472-4208.

Proposed Changes

We are updating the Seattle construction codes to the 2021 editions. See the 2021 Seattle Code Adoption page for more information.

Construction and Inspections

Nathan Torgelson, Director
Address: 700 5th Ave, Suite 2000, Seattle, WA, 98104
Mailing Address: P.O. Box 34019, Seattle, WA, 98124-4019
Phone: (206) 684-8600
Phone Alt: Violation Complaint Line: (206) 615-0808
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SDCI issues land use, construction, and trade permits, conducts construction and housing-related inspections, ensures compliance with our codes, and regulates rental rules. SDCI is committed to an antiracist workplace and to addressing racism through our work in the community.