Washington Geological Survey
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.
December 2025 Atmospheric River Landslides Clearinghouse Has Been Activated
As of Jan 23, 2026, we have activated the Washington Geologic Hazards Clearinghouse in response to the December 2025 Atmospheric River Landslides event. Visit our Clearinghouse webpage to read more.
What's New
Geologic Map of the Cougar Mountain 7.5-minute Quadrangle
On Jan 7 we released a new geologic map of the Cougar Mountain 7.5-minute quadrangle at a scale of 1:24,000. Click here to download the map and pamphlet
Geologic Map of the Manastash Creek 7.5-minute Quadrangle
On Jan 7 we released a new geologic map of the Manastash Creek 7.5-minute quadrangle at a scale of 1:24,000. Click here to download the map and pamphlet.
Geologic Map of the Tanwax Lake 7.5-minute Quadrangle
On Jan 7 we released a new geologic map of the Tanwax Lake 7.5-minute quadrangle at a scale of 1:24,000. Click here to download the map and pamphlet.
Geologic Map of the Enumclaw 7.5-minute Quadrangle
On Jan 7 we released a new geologic map of the Enumclaw 7.5-minute quadrangle at a scale of 1:24,000. Click here to download the map and pamphlet.
Washington Geological Survey Landslide Response
The Washington Geological Survey is responding to landslides triggered by the current atmospheric river event by providing crucial information for local jurisdictions to ensure the safety of their residents. Read more here.
Lidar Image Releases
In December we celebrated the 10th anniversary of the Lidar Program with ten new images featuring Washington geology. With these releases, we now have 100 lidar images available for download.
WALERT report for the Wildcat Fire
On December 18 we released a new Wildfire-Associated Landslide Emergency Response Team report for the Wildcat Fire in Yakima County. Click here to download the report.
Reports from the School Seismic Safety Program
On December 17 we released three new district-level reports for the School Seismic Safety Program. See the new reports and read more about the program on the School Seismic Safety webpage.
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.
