| R2-2018-1020 | Order No. R2-2018-1020 Settlement Agreement and Stipulation for Entry of Administrative Civil Liability for City of Half Moon Bay | Enforcement | San Mateo County | September | 2018 |
| R2-2018-0045 | Order No. R2-2018-0045 Waste Discharge Requirements for City and County of San Francisco, by and through the Airport Commission, and the North Bayside System Unit | Permit | San Mateo County | October | 2018 |
| R2-2018-0046 | Order No. R2-2018-0046 Renewal of Conditional Waiver of Waste Discharge Requirements for Grazing Operations in the Tomales Bay Watershed (Tomales Bay, Lagunitas Creek, Walker Creek, and Olema Creek) | Permit | Various | October | 2018 |
| R2-2018-1021 | Order No. R2-2018-1021 Settlement Agreement and Stipulation for Entry of Administrative Civil Liability for Livermore-Amador Valley Water Management Agency (LAVWMA) | Enforcement | Alameda Co. | October | 2018 |
| R2-2018-1022 | Order No. R2-2018-1022 Settlement Agreement and Stipulation for Entry of Administrative Civil Liability for Montara Water and Sanitary District | Enforcement | San Mateo Co. | November | 2018 |
| R2-2018-0040 | Order No. R2-2018-0040 Rescission of Order No. R2-2002-0089; Waste Discharge Requirements and Water Quality Certification for Santa Clara Valley Water District, Lower Guadalupe River Flood Protection Project | Rescission | Santa Clara County | August | 2018 |
| R2-2018-0050 | Order No. R2-2018-0050 Amendment of Order No. R2-2017-0048 for General Waste Discharge Requirements or Reclamation of Extracted and Treated Groundwater Resulting from the Cleanup of Groundwater Polluted by Volatile Organic Compounds (VOCs), Fuel Leaks, Fuel Additives, and other Related Wastes (VOC and Fuel General Permit) | Permit | Various | November | 2018 |
| R2-2018-0041 | Order No. R2-2018-0041 Adoption of Site Cleanup Requirements for Frank L. Burrell, Trustee of the Frank L. Burrell 1937 Trust for the Property Located at 14440 Big Basin Way, Saratoga | Permit | Santa Clara County | August | 2018 |
| R2-2018-0025 | Order No. R2-2018-0025 Waste Discharge Requirements for Sausalito-Marin City Sanitary District, Sausalito-Marin City Sanitary District Wastewater Treatment Plant and Collection System | Permit | Marin County | June | 2018 |
| R2-2018-0048 | Order No. R2-2018-0048 Reissuance of NPDES Permit for Browning-Ferris Industries, Corinda Los Trancos (Ox Mountain) Landfill | Permit | San Mateo County | November | 2018 |
