Aquatic invasive species (AIS) are organisms that have spread beyond their native range and present threats to our environment, economy, human health, and way of life. Preventing the introduction of AIS and stopping their spread is crucial to protecting Washington’s waters, fish, and wildlife.
When free of the natural conditions in their native range that kept their populations in check — such as predators, competitors, parasites, and other environmental conditions — AIS can spread rapidly, displacing native species, degrading habitats, changing water quality, and impacting ecosystems.
Prevention is our best defense. AIS are often introduced and spread through human activity, either purposely released or accidently transported on aquatic plants, gear, equipment, and watercraft.
If you find a potential invasive species, report it using the Washington Invasive Species Council webform or the WA Invasives mobile app (available in the Apple and Google app stores).
Questions? Call WDFW's Aquatic Invasive Species hotline at 1-888-WDFW-AIS or email ais@dfw.wa.gov.
For AIS information offline, download WDFW's printable AIS brochure (PDF).
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Aquatic invasive species search tool
Find more information on invasive and non-native aquatic species currently threatening Washington.
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Aquatic invasive species of greatest concern
AIS like quagga and zebra mussels and European green crab have dramatic impacts on our ecosystems, outdoor recreation, and the economy.
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Preventing the spread of aquatic invasive species
If you work or play in Washington’s waters, you may be at risk of introducing or spreading AIS. Be part of the solution by taking preventative actions like Clean, Dry, Drain and stopping at mandatory watercraft inspection stations.
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Boating in Washington FAQs
Know AIS requirements before you go boating in Washington.
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Watercraft inspection stations
Request an appointment for a free boat boat inspection in Eastern or Central Washington.
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AIS prevention permits for watercraft
Watercraft and seaplanes registered outside of Washington and commercial transporters of vessels must purchase an AIS prevention permit
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Ballast water
Non-native species can enter Washington’s waterways through the discharge of ships’ ballast water, which is used to stabilize vessels.
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AIS publications
Review and download program reports and studies.