2020 Snohomish County Stormwater Management Program (SWMP) Plan 2019 Snohomish County Stormwater Management Program (SWMP) Plan 2018 Snohomish County SWMP Plan 2017 Stormwater Management Program Plan 2015 Stormwater Management Program Plan 2015 Structural Stormwater Control Program 2016 Stormwater Management Program Plan 2016 Structural Stormwater Control Program Plan 2014 Structural Stormwater Control Program Plan 2014 Stormwater Management Program Plan 2013 Structural Stormwater Control Program Plan 2013 Stormwater Management Program Plan 2012 Structural Stormwater Control Program Plan 2012 Stormwater Management Program Plan Draft Bacteria Pollution Control Plan 2011 Structural Stormwater Control Program Plan 2011 Stormwater Management Program Plan 2010 Structural Stormwater Control Program Plan 2010 Stormwater Management Program Plan 2009 Stormwater Management Program Plan 2008 Stormwater Management Program Plan