Snohomish County Public Works Surface Water ManagementA media filter structure is a storm water basin or vault that contains filtration media. Its intended purpose is to filter out pollutants from storm water than enters the structure. These are mapped to allow for inspection and maintenance as part of Snohomish County's National Pollutant Discharge Elimination System (NPDES) permit.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/c71aac30661241afae89444e4a4b768f_0engSnohomish County Open Data PortalPublicMedia Filter Structure [Washington (State)--Snohomish County]Web servicesWashington (State)--Snohomish CountyWashington (State)Last Modified: 2022-11-09