401 Certification for Hydropower

The state of Washington works with the Federal Energy Regulatory Commission (FERC) licensing process for hydropower dams. When an applicant requests a license, either to re-license an existing dam or for new construction, Ecology works with the utility, reviews studies, analyses and plans. If Ecology determines that water quality standards are attainable, a 401 certification is issued with conditions to ensure that the standards will be met. These conditions become part of the new FERC license.




Water Power License Fee Stakeholder Workgroup


Existing 401 Certifications for Dams

Draft Water Quality Certifications for Public Review

401 Guidance Manual

Links to other programs and activities

Related Information



For more information please contact:

Water Quality & Hydropower Lead Scientist
Water Quality Program
WA Department of Ecology
Phone: 360-407-6128
e-mail: Chad.Brown@ecy.wa.gov