Inspectors will be looking for invasive quagga mussels at the Coyote, Calero, Stevens Creek and Lexington reservoirs.
The mussels can clog water pipes, ruin boat motors and threaten the ecosystem. They are native to the Ukraine and have spread from one body of water to another bay attaching themselves to boats.
There is a $7 inspection fee. However, boaters have the option to purchase an annual pass for $35.