Help Halt Golden Mussel Invasion

Redding, Calif., June 17, 2025 — In October 2024, the California Department of Water Resources discovered non-native, highly-invasive golden mussels in the Bay-Delta near Stockton, California. Once established, golden mussels can spread rapidly, significantly damaging natural ecosystems, water infrastructure, agriculture, and economies. The Shasta-Trinity National Forest is reminding visitors to clean, drain and dry watercraft before and after launch, and to contact the waterbody they plan to visit before heading out. 

Native to rivers and creeks of China and Southeast Asia, the golden mussel was likely introduced to Californian waters via international shipping. This species is known to have negative ecological and recreational impacts similar to those of quagga and zebra mussels. While similar, golden mussels can thrive in a wider variety of ecological conditions, increasing the risk of establishment and spread if introduced. 

To prevent unintentionally moving invasive mussels between bodies of water, we can all do the following: 

• Clean, Drain and Dry all equipment watercraft before and after entering a waterbody.
  • Clean off all aquatic material from your boat, trailer and equipment before leaving the boat ramp or parking lot.
  • Drain  ballast, bilge, live-wells, and anything containing water. Never drain back into the waterway.
  • Dry equipment thoroughly before launching or entering into a body of water. Waiting periods vary, so check with the waterbody or local Forest Service office for specific inspection standards.
  • Know Before You Go: contact the waterbody you plan to visit to find out about launching requirements.
  • Purchase  the Mussel Fee Sticker, which are required for all motorized watercraft operated in freshwater. 

Additionally, the state of California has developed a comprehensive Golden Mussel Response Framework to address this urgent invasive species threat. The framework provides coordinated strategies to prevent further introduction and spread, as well as to contain and suppress infestations. 

For the latest updates on the golden mussel, visit the CDFW Aquatic Invasive Species webpage. 

To learn more about overall water safety, visit the Recreate Responsibly Coalition’s webpage.