Thurston GeoData CenterThe purpose of this data is to show Thurston County's Group A, Group B and Group B Exempt community water system boundaries.Group A Public Water System is classified as a community system with 15 or more connections or serves greater than 25 or more people per day for 60 days or more per year. Group B Public Water System is classified as a community system with 3 to 14 connections and less than 25 people per day or serves 25 or more people per day during fewer than 60 days per year. Group B Exempt Public Water Systems are classified as community systems that were formerly Group B, by State DOH, but were downgraded to Exempt Systems due to their size/number of connections. These systems are no longer tracked by the State but are still tracked, under their previous ids/tags, by Thurston County. This change occurred in 2016/2017.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/0952c1acaaee49b5b835eae7c9bf6ac0_0engThurston GeoData CenterPublicThurston Community Water System Areas [Washington (State)--Thurston County]Web servicesWashington (State)--Thurston CountyWashington (State)Last Modified: 2025-07-10