Lake County Illinois GISDownload In State Plane Projection Here . The Central Lake County Joint Action Water Agency (JAWA) is a consortium of the municipalities of Grayslake, Gurnee, Lake Bluff, Libertyville, Mundelein, Round Lake, Round Lake Beach, Round Lake Heights, Round Lake Park and Lake County Government representing the communities of Knollwood/Rondout, Vernon Hills and Wildwood for the purpose of supplying Lake Michigan water to these geographic areas. Update Frequency: This dataset is updated on a weekly basis.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/df76bdded0a743bcaa8e7c208b3a1e02_7engLake County Illinois Open Data PortalPublicJoint Action Water Agency (JAWA) [Illinois--Lake County]Web servicesIllinois--Lake CountyIllinoisLast Modified: 2026-01-04