Snohomish County Public Works Surface Water ManagementWater quality features are designed to infiltrate and filtrate storm water that enters them, typically through layers of natural material. Examples include bioswales, bioinfiltration cells, filter strips, and constructed wetlands. 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/928f078f9db84869b1eafa968d2d7fe0_0engSnohomish County Open Data PortalPublicWater Quality Feature [Washington (State)--Snohomish County]Web servicesWashington (State)--Snohomish CountyWashington (State)Last Modified: 2022-11-10