TMDL and ARP Investigations

The San Diego Water Board works collaboratively with stakeholder groups to address impaired water bodies throughout the region. The development steps of a TMDL investigation include assessing the water body, defining total loads, developing allocations, and implementation plans to address the water quality impairment(s).

A TMDL investigation may result in adopting a TMDL as a Basin Plan amendment, or advance restoration plans (ARPs) may be identified to address water quality impairments. Some examples of ARPs include use of existing permits such as the Regional MS4 Permit, investigative orders, and cleanup and abatement orders. TMDL and ARP projects listed are currently under development.

Many of the TMDL investigations in and around San Diego Bay resulted in adopted enforcement orders in lieu of adopted TMDLs as Basin Plan amendments. Additional information on San Diego Bay sites can also be found in GeoTracker.

EPA 2022 Vision report
San Diego Water Board 2022 USEPA Vision Reports – San Diego Bay sites