Six Quagga mussels were found in the Angeles Tunnel Thursday, which serves as a connector between Pyramid Lake and two State Water Project components, according to the California Department of Water Resources.
Pyramid Lake, Elderberry Forebay and Castaic Lake are considered infested due to this discovery.
Boats going into Pyramid Lake must be inspected and thoroughly washed after leaving the lake due to its “infested” status.
There is currently no evidence of mussel reproduction.
The species was first discovered in California in 2007 and has successfully been kept out of the State Water Project since then.
Agencies are working to manage the invasive mussels.