Construction and environmental permits The Washington Department of Fish and Wildlife issues approvals and permits that protect fish, wildlife, and habitats around the state. Hydraulic Project Approval (HPA) Most projects in or around water in Washington require an HPA. Learn about the different types of HPAs and how to apply. State Environmental Policy Act (SEPA) SEPA is a review process that requires government agencies to identify environmental impacts that may result from agency actions. Rules for mineral prospecting and placer mining WDFW's Gold and Fish pamphlet offers regulatory information for mineral prospecting and placer mining activities in Washington. Rules for aquatic plant removal and control WDFW regulates aquatic plant removal and control through the Aquatic Plants and Fish pamphlet. Aquatic invasive species prevention permits Some aircraft and watercraft operators must purchase permits to help WDFW prevent the spread of invasive species. Scientific Collection Permits Scientific collection permits are issued to scientists/researchers, educators/educational institutions, and museums, aquariums, and zoos.