An invasive species of golden mussels has prompted a state of emergency in California's San Joaquin and Kern Counties, threatening water quality and critical infrastructure. The mussels, which can clog pipes and damage equipment, have already cost the county $3 million in chemical eradication efforts since their discovery in the Sacramento–San Joaquin Delta in 2024.
Sam Blue of the Arvin-Edison Water Storage District described the threat as “real,” noting that the mussels move “with terrifying speed” and that a single female can produce over one million eggs annually. The infestation has affected a $100 million floodgate and raised concerns about water flow to homes and agriculture.
Golden mussels have been found on a boat hull in Oregon waters, sparking fears of further spread to Washington. Washington's Department of Fish and Wildlife stated that the risk of introduction to their waters is now significant, as the mussels can survive short periods in saltwater and grow up to two inches long.
Unlike zebra and quagga mussels, golden mussels can swim, allowing them to form dense carpets and spread rapidly. They are filter feeders that consume microscopic plants and animals, threatening native species and increasing the risk of harmful algal blooms.
Authorities emphasize that prevention is crucial. Boat owners are advised to remove visible mussels, drain water-containing devices, and dry equipment for at least five days. Congressman Vince Fong has secured $5 million for an inspection and prevention program to protect Central Valley water infrastructure.
