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.
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.
The following documents are provided to aid the development community in preparing stormwater designs:
- Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPs
All development projects which construct stormwater facilities are required to record a Declaration of Covenant which obligates the property owner(s) to maintain their stormwater facilities. Use this template for projects which do not qualify as Small Projects.
- Small Project Site Plan/Report Template (PDF)
Preparation of Stormwater Site Plan, also called a drainage report, can be a daunting task and usually requires the services of a professional to prepare. This template may be used to address the Stormwater Site Plan requirements for small projects which do not require a full stormwater design. The template may be filled out by the property owner or project proponent, although some elements may still require professional qualifications to prepare. When fully completed this template addresses all of the requirements of Minimum Requirement 1 in the Stormwater Management Manual for a Stormwater Site Plan, and may be submitted as the Stormwater Site Plan for the proposed project.
- Small Project Declaration of Covenant for Inspection and Maintenance of Onsite Stormwater BMPs (PDF)
Projects that must address only Minimum Requirements 1-5 in the Stormwater Management Manual, and are eligible to submit the Small Project Site Plan Template, should use this Declaration of Covenant template instead of the standard facility version above.
- Supplemental Guidance and Project Forms for Minimum Requirements #1-9
The following information provides supplemental guidance and a general outline for Minimum Requirement (MR) #1-9 Stormwater Site Plans (SSP). Required forms are attached to the end of this guidance document.
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.