The steep slopes of the volcano Mt. Adams rise above the south cascades.

Washington Geological Survey

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Site under construction

Thank you for visiting the website of the Washington Geological Survey. We are in the process of upgrading our website to be more accessible. During the update process, some features and pages you may expect to see on our site might look different or be unavailable.

Please check back again in a few days, or reach out to WGS editor Nikolas Midttun (nikolas.midttun@dnr.wa.gov) with any questions. Thank you for your patience!

Welcome to the official website of the Washington Geological Survey. Our team works to understand and share Washington’s geology. We study hazards including tsunamis, earthquakes, landslides, and debris flows; produce maps of geology and aggregate resources; maintain databases of geologic data; and so much more. 

Use the sidebar at right for our most visited pages, and navigate the survey's website using the menu to the left. 

Read more about the survey on our about page.

What's New

Columbia basin groundwater database distribution of samples colored by formation type

Groundwater chemistry database for the Columbia basin

On Jul 3 we released a new groundwater chemistry database including 1,537 water samples from wells and other water sources in the Columbia River Basalt Group in the Columbia basin. A pamphlet and a spreadsheet provide an overview, analysis, and data. The data are also available in a new Groundwater Geochemistry geodatabase on our GIS Data and Databases page.

 

Thumbnail view of a figure from the Thurston County Landslides publication

Landslide inventory of Thurston County, Washington

On Apr 30 we released a new landslide inventory for Thurston County. A pamphlet provides an overview, and the geospatial data are available on our Geologic Information Portal or from the Washington State Landslide Inventory Database (WASLID) on our GIS Data and Databases page.​​​

 

Thumbnail view of the new Earthquakes and Faults Database.

Major update to our Quaternary Active Faults database

On Apr 28 we released a major update of our Quaternary Active Faults database. The new database can be viewed on the Geologic Information Portal or downloaded from our GIS Data and Databases page.

 

Visit the Washington Geology News blog to see more announcements and updates.
Visit the past releases page to see publications released more than three months ago.