Adopted TMDLs
Adopted TMDLs and ARPs
TMDLs and ARPs Adopted by Regional Board
A TMDL project may consist of a single water body and pollutant, or a combination of multiple water bodies and pollutant listings to restore impaired water bodies. The results of a TMDL investigation can lead to identifying the use of other regulatory tools to address the water quality impairment prior to adopting the TMDL as a Basin Plan amendment.
An Advance Restoration Plan (ARP) is a near-term action plan, with a schedule and milestones, that focuses on executing restoration actions prior to final adoption of the TMDL. If the actions of the ARP are successful in restoring an impaired waterbody, then the need for adopting a TMDL as a Basin Plan amendment is alleviated.
Below is a list of adopted TMDL projects by the San Diego Water Board and approved ARPs. Click on the links to view documents, notices and other materials related to each project.
| Adopted TMDLs | Adoption Date |
| Chollas Creek Diazinon TMDL | August 14, 2002 |
| Rainbow Creek Nitrogen and Phosphorus TMDLs | February 9, 2005 |
| Shelter Island Yacht Basin Dissolved Copper TMDL | February 9, 2005 |
| Chollas Creek Copper, Lead, and Zinc TMDLs | June 13, 2007 |
| Indicator Bacteria: Revised Project I - Twenty Beaches and Creeks in San Diego Region (including Tecolote Creek) | February 10, 2010 |
| Indicator Bacteria: Project II - Baby Beach in Dana Point Harbor and Shelter Island Shoreline Park in San Diego Bay | June 11, 2008 |
| Los Peñasquitos Lagoon Sediment TMDL | June 13, 2012 |
| Approved Advance Restoration Plans (ARPs) | Approval Date |
| Loma Alta Slough TMDL Phosphorus | June 26, 2014 |
| Famosa Slough Nutrient TMDL | October 31, 2017 |
| Santa Margarita River Estuary TMDL | May 9, 2019 |
| San Mateo Creek Invasive Species TMDL | January 19, 2024 |
| Tijuana River ARP | December 11, 2024 |
