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Groundwater Data

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 nearly 8000 wells.  For security reasons, data is only available by request.  Requests for groundwater data can be made by contacting the Island County Hydrogeologist.

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.​

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