The City of Seattle requires that a side sewer permit be issued before work begins on all side sewers, including new installations, alterations, repairs, capping, relocations, removals, and conditional and temporary dewatering work. The permit for this work will cover all proposed side sewer work located on-site and within the public right-of-way. Both sanitary and drainage lines may be included on the same permit application.

All side sewer construction located in the public right-of-way must be completed by a Registered Side Sewer Contractor (RSSC). DPD maintains and updates the list of RSSCs. For private property, the work does not need to be completed by an RSSC.