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Inspections for Quagga and Zebra Mussels in California

Non-native aquatic species of plants, fish and animals – such as Hydrilla, Egeria densa, Water Hyacinth, and quagga and zebra mussels - are threatening the waters of California. They are known as ‘’Aquatic Invasive Species’’ because under the right conditions, these nuisance species can increase at an alarming rate, displacing the native species, causing blockages of the waterways, and having a negative impact on navigation and recreation.

They are next to impossible to eliminate once they are introduced. It is imperative to properly clean watercraft and equipment after each use. 

Inspections for Quagga and Zebra Mussels are determined by county or local municipalities, and—in some cases—the Department of Parks and Recreation. Boaters should check to see whether boat inspections will be required beforehand. 

Visit for more information on quagga and zebra mussels or call (866) 440-9530.

Be sure to report new infestations of non-native aquatic species to the U.S. Fish and Wildlife Service at (209) 946-6400.

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