401 Certification and Isolated Permitting
401 Water Quality Certifications and Isolated Wetlands/Water Permitting
Learn about how to apply for a water quality certification or isolated wetlands/waters permit, general certifications, compensatory mitigation and stormwater management.
Learn about expedited permitting options available in the DWR Washington and Wilmington Regional Offices.
Learn about our state's water resources including streams and wetlands, how to obtain stream determinations and more.
Read the statutes and rules that govern our streams and wetlands.
Read our guides and manuals that have been developed for streams, lakes, reservoirs and wetlands.