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 most current Washington State Department of Ecology Stormwater Management Manual for Western Washington, along with any technical and administrative procedures established by the city engineer…."

The most current 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 City Engineer 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.

On July 31, 2019, City Council adopted an ordinance to add the following sentences to the Everett Municipal Code 14.28.020(37): “When the Washington State Department of Ecology issues a new or revised Stormwater Management Manual for Western Washington, the new or revised manual will for the purposes of this chapter take effect 90 days after such issuance, unless the city engineer establishes a different effective date.” The City Engineer has established January 1, 2020, as the effective date for the July 2019 version of the Ecology Stormwater Management Manual for Western Washington.

  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 submitted for permit prior to December 31, 2019 were subject to standards established by Public Works Director Policy No 2-11. The interim policy references a previous version of the City’s Stormwater Management Manual, the City of Everett 2010 Stormwater Management Manual. The 2010 City of Everett Stormwater Management Manual is provided below for projects which are still being reviewed. It is not applicable to projects which apply for a development permit after January 1, 2020.

2010 Everett Stormwater Management Manual