Snohomish County Public Works Surface Water ManagementDetention and infiltration ponds are intended to store or infiltrate, respectively, storm water that enters them. Ponds 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/54bbe0b5d6a446288ac1595df29efe26_0engSnohomish County Open Data PortalPublicPond [Washington (State)--Snohomish County]Web servicesWashington (State)--Snohomish CountyWashington (State)Last Modified: 2022-11-10