A Tiny Invasive Species Is a Big Threat to CA Water

When thimble-sized mussels were first detected last year in the Sacramento-San Joaquin Delta, biologists quickly rang the alarm over how severely this invasive species could threaten the state’s water supply systems.

Now, nine months after the mollusks’ appearance near Stockton, officials are in a race to rein in golden mussels as their larvae spread through the state’s network of pumps, pipes and canals, reports CalMatters’ Rachel Becker.