Wisconsin invasive species rule adds 65 species, effective Jan. 1, 2027

The Wisconsin Department of Natural Resources (DNR) says a rule update taking effect Jan. 1, 2027, will change how the state handles invasive species.Wisconsin's new invasive species ruleOn Nov. 12, the Wisconsin DNR announced revisions to the state's invasive species identification, classification and control rule. The agency said the update clarifies key sections and updates which species are covered.The DNR defines invasive species as non-native organisms that harm Wisconsin's environment and economy or may threaten human health. Under the rule, it is unlawful to transport, transfer, introduce and in some cases possess regulated species, according to the agency.The updated rule keeps two categories for invasive species: prohibited and restricted. The DNR said the categories reflect how widespread a species is in Wisconsin and what actions people can legally take.According to the Wisconsin DNR, prohibited species are not yet present in Wisconsin or may exist only in small, isolated p