| R2-2021-0005 | Order No. R2-2021-0005, Amended Waste Discharge Requirements and Water Quality Certification, Order No. R2-2020-0034 for Napa County Flood Control and Water Conservation District, Stream Maintenance Program; San Mateo County Routine Maintenance Program; Contra Costa County Flood Control and Water Conservation District and Contra Costa County Public Works Department Routine Maintenance Program | Permit | Various | April | 2021 |
| R2-2021-1007 | Order No. R2-2021-1007, Settlement Agreement and Stipulation for Entry of Administrative Civil Liability for Martinez Refining Company, LLC | Enforcement | Contra Costa | April | 2021 |
| R2-2021-1004 | Order No. R2-2021-1004, Acceptance of Conditional Resolution and Waiver of Right to Hearing for Treasure Island Development Group, Former Naval Station, Treasure Island | Enforcement | San Francisco County | May | 2021 |
| R2-2021-1010 | Order No. R2-2021-1010, Settlement Agreement and Stipulation for entry of Administrative Civil Liability for Republic Services, Inc., and West Contra Costa Sanitary Landfill, Inc. | Enforcement | Contra Costa County | May | 2021 |
| R2-2021-0009 | Order No. R2-2021-0009, General Waste Discharge Requirements for Discharge of Filter Backwash from Drinking Water Facilities | Permit | Various | May | 2021 |
| R2-2021-0008 | Order No. R2-2021-0008, Waste Discharge Requirements for City of Petaluma, Ellis Creek Water Recycling Facility and its Collection System | Permit | Sonoma | May | 2021 |
| R2-2021-1015 | Order No. R2-2021-1015, Acceptance of Conditional Resolution and Waiver of Right to Hearing for City of East Palo Alto Bay Road Project | Enforcement | San Mateo County | May | 2021 |
| R2-2021-0010 | Order No. R2-2021-0010, Waste Discharge Requirements for Stevens Creek Quarry, Inc., Cupertino Quarry | Permit | Santa Clara County | May | 2021 |
| R2-2021-0007 | Order No. R2-2021-0007, Waste Discharge Requirements for Livermore-Amador Valley Water Management Agency (LAVWMA) | Permit | Alameda County | May | 2021 |
| R2-2021-0012 | Order No. R2-2021-0012, Waste Discharge Requirements for Eco Services Operations Corp., Eco Services Martinez Plant | Permit | Contra Costa County | May | 2021 |
