Stormwater Technical Resources

Stormwater requirements within the city of Everett are established in Everett Municipal Code (EMC) 14.28, which establishes requirements for stormwater elements of new and redevelopment. EMC 14.28 states that development projects shall comply with the requirements of the City's Stormwater Management Manual, which is defined as "the Washington State Department of Ecology Stormwater Management Manual for Western Washington adopted by the director, along with any technical and administrative procedures established by the director..."

The currently adopted version of the Washington State Department of Ecology Stormwater Management Manual for Western Washington (SWMMWW) is the 2019 Stormwater Management Manual for Western Washington. Additional stormwater requirements established by the Director are generally found in Chapter 4 of the Design and Construction Standards and Specifications (DCSS). Development projects must meet the requirements of both the Stormwater Management Manual and the DCSS.

  1. Combined Sewer Area
  2. Permitting Resources
  3. Stormwater Mapping
  4. Other Stormwater Permits

Portions of the city drain to a combined collection system that receives both sanitary sewage and stormwater. Projects that drain to this system are subject to different requirements than the rest of the city since runoff from the projects isn’t routed directly to surface waters.

A general idea of the boundaries of the combined sewer system can be found in the City’s Drainage Basins & Watersheds Map. Projects should verify whether they discharge to the combined system by consulting the City’s utility mapping office (425-257-8800) or contacting development services (425-257-8810).

The requirements for development within the combined sewer area are established in Section 6.10 of the Design and Construction Standards and Specifications. Projects which create less than 2,000 square feet of net-new impervious surface may use the Small Project Stormwater Site Plan/Report for projects in the Combined Sewer Area template to design and document required stormwater facilities.