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 2012 Stormwater Management Manual for Western Washington, as Amended in December 2014.
Additional stormwater requirements established by the City Engineer are generally found in Chapter 4 of the Design and Development Standards and Specifications (DCSS). Development projects must meet the requirements of both the Stormwater Management Manual and the DCSS.
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 Public Works Director Interim Policy No. 211.
The interim policy references a previous version of the City’s Stormwater Management Manual, the 2010 Stormwater Management Manual.
2010 Everett Stormwater Management Manual
Infiltration Infeasibility Map
The infiltration infeasibility map identifies areas within the City where infiltration best management practices (BMPs) can be deemed infeasible for the purposes of complying with stormwater regulations. This information is also available on the Map Everett interactive map.
Interactive Utility Mapping
The Map Everett Interactive Map includes mapping of the City’s storm drainage system. This map can be used to identify downstream flow routes from a site and identify existing stormwater infrastructure.
Construction Stormwater General Permit
Projects which disturb one or more acres of land and discharge to surface waters must obtain coverage under the Ecology's Construction Stormwater General Permit.
Industrial Stormwater General Permit
Some industrial operations must obtain coverage under the Industrial Stormwater General Permit, which regulates stormwater discharges from certain types of industrial sites.
Sand and Gravel Stormwater General Permit
Businesses involved in the production, hauling, or storage of sand or gravel materials may require coverage under the Sand and Gravel General Permit.
Boatyard General Permit
Facilities which store, maintain, or transport water craft may require coverage under the Boatyard Stormwater General Permit.
Underground Injection Wells
Stormwater facilities which infiltrate stormwater by means of an underground facility such as an infiltration trench or vault may need to be registered as an underground injection well (UIC). Surface facilities, such as ponds or rain gardens generally do not require registration.