The Side Sewer Code (Seattle Municipal Code 21.16) and its accompanying Director’s Rule (DR) address the design, construction and permitting requirements and regulations for side sewer work in the City of Seattle. Side sewers are privately owned pipe systems that can be for either wastewater or drainage discharges. Side sewers can be located on private property and/or in the right of way.

The 2007 Side Sewer Code and DR Revision effort is a joint project between the Department of Planning and Development and Seattle Public Utilities. The code and rule are living documents that are updated regularly by the City to respond to changes in City regulations and policies. The last revision effort was made effective in April 2006.