Washington Bans Golden Mussels as Invasive Threat

New emergency rule aims to prevent spread of destructive aquatic species

Apr. 14, 2026 at 10:56pm

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A highly textured, abstract painting in soft earth tones of green, brown, and blue, featuring sweeping geometric arcs, concentric circular patterns, and precise botanical spirals, conveying the interconnected forces of the aquatic ecosystem under threat from the golden mussel invasion.A conceptual illustration depicting the complex biological forces at play as Washington works to prevent the spread of the invasive golden mussel.Bellingham Today

The Washington Department of Fish and Wildlife has classified the golden mussel as a prohibited invasive species throughout the state, making it illegal to purchase, transport, retain, or introduce the mussel into local waterways. This emergency rule was prompted after the discovery of a golden mussel-fouled boat in southern Oregon last week, raising concerns about the potential damage the species could cause if it becomes established in Washington.

Why it matters

Golden mussels pose a similar threat to Washington's waters as the already invasive quagga and zebra mussels, which can cause significant ecological and economic harm by disrupting aquatic ecosystems and clogging infrastructure like hydroelectric dams and water intake pipes. The new classification will allow inspection stations to actively look for and prevent the introduction of golden mussels into the state.

The details

Under the new emergency rule, it is now illegal to purchase, transport, retain, or introduce golden mussels into local water bodies in Washington. The state Department of Fish and Wildlife made this classification after the discovery of a golden mussel-fouled boat in southern Oregon last week, raising concerns about the potential for the invasive species to spread into Washington's waterways.

  • The emergency rule was instituted in April 2026.

The players

Washington Department of Fish and Wildlife

The state agency responsible for managing and protecting Washington's fish and wildlife resources, including monitoring and regulating invasive species.

Oregon Department of Fish and Wildlife

The state agency in Oregon that encountered the golden mussel-fouled boat, prompting the emergency rule in neighboring Washington.

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What’s next

The state will now work to educate the public and enforce the new prohibition on golden mussels, including increased inspections at boat launches and other access points to local waterways.

The takeaway

This emergency rule highlights the ongoing battle against invasive species, which can pose significant threats to local ecosystems and infrastructure if left unchecked. The proactive approach taken by Washington's wildlife agency aims to prevent the establishment of golden mussels before they can cause widespread damage.