2018 City of Seattle Plumbing Code
The city of Seattle has formally adopted the 2018 Seattle Plumbing Code (SPC), which is based on IAPMO’s 2018 Uniform Plumbing Code (UPC®).
The 2018 edition of the SPC is a custom plumbing code published for the city of Seattle. It also protects against hazards that may arise from the use of plumbing piping and systems by regulating and controlling the design, construction, installation, quality of materials, location and operation of plumbing piping systems within the city of Seattle. The code includes the Washington state and Seattle amendments integrated into the 2018 UPC. This edition also includes the new Water Demand Calculator for estimating water supply demand and pipe sizing.
