2018 Seattle Plumbing Code

The 2018 Edition of the Seattle Plumbing Code (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. Based on the 2018 Uniform Plumbing Code, this code includes the Washington State and Seattle Amendments integrated into the Uniform Plumbing Code. This edition also includes the new Water Demand Calculator for estimating water supply demand and pipe sizing