The 2023 Stormwater Management Program (SWMP) Plan describes the actions and programs that Snohomish County intends to carry out to meet requirements of the National Pollutant Discharge Elimination System (NPDES) Phase I Municipal Stormwater Permit, with specific emphasis on actions and programs to be implemented in 2023.

Archived Plans

To view past Snohomish County SWMP Plans (2008-2021), click here.