You must request a Section 401 Certification to conduct any activity that might result in any discharge into waters or non-isolated wetlands or excavation in water or non-isolated wetlands (including dredge or fill material) into waters of the United States.
Categories of 401 Water Quality certifications
FERC hydropower re-licenses: Ecology works with the Federal Energy Regulatory Commission (FERC) to re-license existing dams or license new construction for hydropower dams. When an applicant requests a certification for a hydropower license, Ecology works with the utility or project proponent and review the applicable studies, analyses, and plans. If Ecology determines that water quality standards are attainable, a 401 certification is issued with appropriate conditions to make sure that environmental standards will be met. These conditions become part of the new FERC license.
US Army Corps of Engineers permits: All projects affecting navigable and protected waters in Washington state, as defined by the federal government, are subject to Section 401 water quality certification. These waters include coastal and marine environments, rivers, streams, lakes, wetlands, etc. This provides a strong opportunity to protect and enhance water quality, aquatic species and habitats, water resources, coastal resources, floodplains, and other environmental elements. This process excludes hydropower re-licenses and NPDES-related projects.
EPA and Tribal NPDES permits: EPA and Tribal governments use National Pollutant Discharge Elimination System (NPDES) permits ensure water quality and to limit the quantity of wastewater and stormwater discharge into surface waters like rivers, lakes, and streams. We write NPDES permits for all non-federal discharges in the state, except those on federal and tribal lands.