Aquatic invasive species (AIS) pose an ongoing threat to Washington's environment and economy. Find out which species are considered invasive in Washington.
| Species | Category | Family | AIS classification |
|---|---|---|---|
| Eastern Lesser siren (Siren intermedia intermedia) | Amphibians | Sirenidae | Prohibited |
| Greater siren (Siren lacertina) | Amphibians | Sirenidae | Prohibited |
| Plains spadefoot toad (Spea bombifrons) | Amphibians | Pelobatidae | Prohibited |
| Western Spadefoot toad (Spea hammondii) | Amphibians | Pelobatidae | Prohibited |
| Hurter's Spadefoot toad (Spea hurterii (Scaphiopus hurteri above)) | Amphibians | Pelobatidae | Prohibited |
| Mexican spadefoot toad (Spea multiplicata) | Amphibians | Pelobatidae | Prohibited |
| Burrowing isopod (Sphaeroma quoyanum) | Crustaceans | Spheromatidae | Prohibited |
| Clubbed Tunicate (Styela clava) | Tunicate/Sea-squirt | Styelidae | Unlisted |
| Red-bellied newt (Taricha rivularis) | Amphibians | Salamandridae | Prohibited |
| Sierra newt (Taricha torosa) | Amphibians | Salamandridae | Prohibited |
| Tetraclitella purpurascens (Tetraclitella purpurascens) | Crustaceans | Tetraclitidae | Regulated |
| Tench (Tinca tinca) | Fish | Cyprinidae | Regulated |
| Pond slider (Trachemys scripta) | Reptiles | Emydidae | Regulated |
| Bosca's newt (Triturus boscai) | Amphibians | Salamandridae | Prohibited |
| Italian Crested newt (Triturus carnifex) | Amphibians | Salamandridae | Prohibited |
| Great Crested newt (Triturus cristatus) | Amphibians | Salamandridae | Prohibited |
| Danube Crested newt (Triturus dobrogicus) | Amphibians | Salamandridae | Prohibited |
| Palmate newt (Triturus helveticus helveticus) | Amphibians | Salamandridae | Prohibited |
| Italian newt (Triturus italicus) | Amphibians | Salamandridae | Prohibited |
| Southern Crested newt (Triturus karelinii) | Amphibians | Salamandridae | Prohibited |
| Marbeled newt (Triturus marmoratus marmoratus) | Amphibians | Salamandridae | Prohibited |
| Carpathian newt (Triturus montandoni) | Amphibians | Salamandridae | Prohibited |
| Banded newt (Triturus vittatus ophryticus) | Amphibians | Salamandridae | Prohibited |
| Smooth newt (Triturus vulgaris lantzi) | Amphibians | Salamandridae | Prohibited |
| Eastern oyster drill (Urosalpinx cinerea) | Molluscs | Gastropoda | Unlisted |