WDFW Takes Steps To Keep Golden Mussels Out

Citing an imminent threat to local waters, the Washington Department of Fish and Wildlife has classified golden mussels as a Prohibited Level 1 invasive species statewide.

The action follows an April 9th interception by the Oregon Department of Fish and Wildlife of a boat contaminated with golden mussels at an Ashland inspection station, confirming a pathway for the species to spread north through recreational watercraft. 

As a Prohibited Level 1 species, live golden mussels may not be possessed or retained, introduced on or into a water body or property, or trafficked (transported, bought, or sold) without WDFW authorization, a permit, or as otherwise provided by rule. 

Golden mussels were first detected in North America in California in 2024.  While not yet found in Washington, state and federal agencies say they pose a high risk to ecosystems, infrastructure, and the economy — similar to zebra and quagga mussels, but able to survive in a wider range of conditions.

WDFW says these invasive mussels can damage fisheries, clog water systems, and cost millions in mitigation.

Officials urge boaters to help prevent the spread by following Clean, Drain, Dry practices and stopping at mandatory inspection stations.  So far this year, Washington inspectors have checked more than 5,800 watercraft and performed hundreds of decontaminations.

WDFW said those those that find something suspicious, they are asked to report potential sightings to the Washington Invasive Species Council on their Website. Reports are distributed to WDFW and other partners to respond. If you have questions, call the AIS hotline at (888) WDFW-AIS.

Visit WDFW’s golden mussel webpage for more species information.  WDFW’s Aquatic Invasive Species (AIS) Division works to prevent the introduction of AIS and stop or slow their spread, protecting Washington’s waters, fish, wildlife, and habitat.

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