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Groundwater Data

NEWS!  Island County Well Data is now available via an Online Well-Viewer Application!  With this application you can view wells in an area.  Clicking on any well provides a link to more information about the well, including scanned well logs, water level, water quality (chemistry) and public water system information (where applicable and available).  Where sufficient data exists, time-series plots of chemistry and water levels are also available. 

MORE NEWS!  A second new groundwater data mapping application provides site-specific spatial analysis of groundwater conditions.  More information about the spatial analysis data products can be found HERE.  To use the Groundwater Spatial Analysis Application, provide your name, e-mail address, and select the location of where you would like your groundwater spatial analysis to be centered.  This application only contains information regarding wells located in Island County.  Picking a location outside of Island County will not return results.   If you are looking to site a new well, picking a location close to your proposed well location will allow this application to more accurately estimate the elevation of your proposed location.  This will provide better estimates of drilling depth to reach aquifer elevations.  Please allow 20 minutes after submission for an e-mail containing documents that summarize location-specific groundwater data analysis.   Note: this application is in beta testing, please feel free to provide feedback!  

Finally, the Island County Seawater Intrusion Risk map is available HERE.   

The hydrogeology program maintains a groundwater database containing information regarding well construction, stratigraphy, groundwater quality (chemistry) and water level data.   Currently the database contains information from over 8000 wells.   You can contact us to make requests for detailed site-specific data and analysis, or to provide information regarding data errors or omissions.

The most common data request involves specifying a search center (typically a parcel or a well) and a search radius (1/2 mile radius is common).  The following standard data products are available for any given search (click on the name to view an example of each):

  • Tabular Listing of information for wells within search radius.  Tabular lists can be provided in .pdf or .xlsx formats. A key to tabular list fields can be found HERE.  The tabular listings provide hyperlinks to additional well information including well logs, water level and water quality data & plots.
  • Map Image (.jpg) of well locations (non-interactive).  A detailed description (legend) of the information contained in the icons used in both the .jpg and .kmz maps can be found HERE.
  • 2D Google-Earth Map (.kmz) of well locations.  This type of map is interactive, users can click on wells to get more information regarding the well, zoom, pan etc.  A detailed description (legend) of the information contained in the icons used in both the .jpg and .kmz maps can be found HERE.  Google Earth maps provide hyperlinks to additional well information including well logs, water level and water quality data & plots.
  • Total Depth Elevation Analysis (TDE), identifies elevations of primary aquifers in the search area.  With this information, and an estimate of land surface elevation of a proposed well site, the user can estimate how deep they will need to drill to tap into an aquifer (estimated well depth = land surface elevation - aquifer elevation).  In the example above, there are two primary aquifers, one occuring between 200 and 225 feet above sea level, the other between 25 and 50 feet below sea level.
  • Stratigraphic 'Stick Diagram'  (jpg image)  showing color-coded stratigraphy of wells in the search area (non-interactive).
  • 3D Google-Earth Map showing well stratigraphy for wells in search area (interactive).
For more information regarding data packages, click the links below:


Please contact the Island County Hydrogeologist to request groundwater data.

Disclaimer:  Data has been collected from a variety of  sources.  Island County makes no guarantee as to the validity or accuracy of this data.  Please report any errors to the Island County Hydrogeologist.​