Monterey County Parks Dept.
General Correspondence
1441 Schilling Place, 2nd Floor
Salinas, CA 93901
831.755.4899 (Reservations)
831.755.4895 (Business) 
888.588.2267 (Toll Free)
831.757.9516 (Fax)

Laguna Seca:
831.242.8200 (Reservations)

Lake San Antonio & Lake Nacimiento:
805.237.4924 (Reservations)


Quagga/zebra mussels

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For more than 50 years, Nacimiento and San Antonio reservoirs have provided agricultural, residential and industrial water supply as well as recreational benefits. The lakes attract thousands of boaters, swimmers and fishermen every year. It has been a valuable investment that needs to be protected.

That's why we're asking you, before you visit Nacimiento and San Antonio reservoirs, to take a few moments to learn about how you can prevent an invasion of Quagga and Zebra mussels to these valuable resources. If we're all vigilant, we can stop these invasive aquatic species from spreading to our reservoirs.

ALL VESSELS AT SAN ANTONIO and NACIMIENTO REQUIRE A VALID VESSEL SCREENING PERMIT PRIOR TO LAUNCH, unless they are currently enrolled in the Resident Vessel Program at Nacimiento

The Problem

Quagga and Zebra mussels are aquatic invasive species that are not native to Nacimiento and San Antonio Reservoirs. If these mussels get into the lakes, they are likely to cause economic and/or environmental harm. The impact of these mussels cannot be overstated. They will displace native species, disrupt ecosystems and harm recreational activities such as boating and fishing. They are likely to also cause considerable financial losses for water supply and commercial activities around the lakes. They have the potential to foul the workings of the dams and the new San Luis Obispo County water delivery system, and to reduce property values around the reservoirs.

Why The Concern?

Quagga and Zebra mussels grow in dense clusters, like barnacles. The microscopic larvae reproduce quickly and thrive in California's warm Mediterranean climate. Quagga mussels were found in Southern California waters in 2007. These mussels pose imminent risks to California's waterways. The costs of managing these mussels in California could reach hundreds of millions of dollars.

Solution (Don't Move Mussels From One Place To Another).

Currently, Zebra mussels are not known to occur in any other California water bodies, but efforts to educate the public and prevent more widespread introduction is underway. It is up to you as an individual boat or pet owner or fisherman to take preventative measures to ensure that the mussels don't travel with you

What You Can Do

The mussels can be transported by recreational boaters and fishermen via boat hulls, motors, ballast water, live bait and other gear, including clothing. What you can do is thoroughly inspect and dry all of your equipment that contacts the water and don't bring in live bait from outside sources. Also, if your pets enter the water, they should be inspected and dried, too. And please use your imagination when cleaning your boat, gear and clothing. Where would you hide if you were a mussel?

Boaters are required to have an inspection and carry the vessel screening permit on the boat. Below are the areas where to inspect your boat.

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