San Diego Region - San Mateo Creek Impaired Waters Implementation Plan to Address Aquatic Invasive Species


San Mateo Creek, located in northern San Diego County, is home to the federally endangered Southern California Steelhead (Oncorhynchus mykiss), with approximately 15 miles of creek designated as critical habitat.  The San Diego Water Board is considering using a draft invasive species Total Maximum Daily Load (TMDL) and plan to certify that actions of other entities will correct impairments to San Mateo Creek beneficial uses caused by invasive species (hereinafter referred to as “Draft TMDL”) .  The presence and proliferation of invasive species in San Mateo Creek is impairing the RARE Beneficial Use of San Mateo Creek for the steelhead.  The use of a TMDL would enable watershed planning and restoration activities be conducted in a collaborative process using federal nonpoint source funding.


The San Diego Water Board has released a draft TMDL for public comment, with public comments due no later than 5 p.m. on November 01, 2022. The draft TMDL, Public Notice, and a Fact Sheet for the TMDL can be found below:


The San Diego Water Board will consider public comments received on the draft TMDL and may makes changes in response to those comments.  The San Diego Water Board will also schedule a public workshop to discuss the draft TMDL.  Following public comments and a workshop, the draft TMDL will then be scheduled for consideration of certification by the San Diego Water Board at a public meeting or by its Executive Officer.