Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the StormwaterVault featureclass created with the following query: WHERE LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) This feature class contains WSDOT's stormwater vaults.Stormwater vaults include various best management practices with underground storage facilities that treat stormwater for water quality and quantity control. These processes occur by detaining runoff, allowing pollutants to settle out in underground storage units, and then releasing reduced flows at established rate standards.The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/0e99daa5e21f4359bb83773b7042bfc9_2engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Vault - BMPs [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06