401 Water Quality Certification and Waste Discharge Requirements Program

Wetland and Riparian Area Protection

The Clean Water Act (CWA) Section 401 Certification and Waste Discharge Requirements Program for dredge and fill activities is an important tool for regulating hydrologic modification projects in addition to other projects which involve dredge and fill.

• Decisions Pending


• Applications for Clean Water Act Section 401 Water Quality Certifications


• Public Notices
Updated: June 20, 2025


• Water Quality Certification Actions Recently Issued
  Updated: June 20, 2025


• Hydromodification and California Wetlands