Jefferson County, WashingtonPolygons showing three types of seawater intrusion protection zones. The base SIPZ was calculated by buffering the WS Department of Natural Resources Ordinary Highwater shoreline to a distance of 1320 feet. At Risk and High Risk SIPZ are based on chloride readings of wells. Information about the seawater intrusion zones and regulations can be found at the Department of Community Development's Seawater Intrusion Page.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/467fe7695c2a45bfb15c78348dbfcf81_27engJefferson County Washington Open Data SitePublicSIPZ Seawater Intrusion Protection Zone [Washington (State)--Jefferson County]Web servicesWashington (State)--Jefferson CountyWashington (State)Last Modified: 2023-04-12