TMDLs for Middle Santa Ana River

TMDLs for Middle Santa Ana River Watershed

The Middle Santa Ana River Watershed covers approximately 488 square miles and lies largely in the southwestern corner of San Bernardino County, and the northwestern corner of Riverside County. A small part of Los Angeles County (Pomona/Claremont area) is also included. This watershed is comprised of three sub–watersheds. TMDLs for indicator bacteria were adopted on August 26, 2005 for the Middle Santa Ana River Watershed through Resolution R8-2005-0001. They were then approved by the Office of Administrative Law (OAL) on September 1, 2006 followed by the US Environmental Protection Agency on (US EPA) May 16, 2007. More information can be found in Chapter 6 of the Santa Ana Water Board Basin Plan.

For more information, please contact Pamela Ybarra at (951) 782-4990