Santa Ana Region - Total Maximum Daily Load

Santa Ana Region - 303(d) List of Water Quality Limited Segments

The 303(d) list of water quality limited segments

The Federal Clean Water Act Section 303(d) requires that States assess the quality of their waters every two years and publish a list of those waters not meeting the water quality standards established for them.  Water quality standards include beneficial uses, water quality objectives necessary to protect these uses and the antidegradation policy, and are found in the Basin Plan. For water bodies placed on the 303(d) List of Water Quality Limited Segments, states are required to develop Total Maximum Daily Loads (TMDLs) for the pollutant(s) that are causing standards impairment.

Water bodies are included on the 303(d) List of Water Quality Limited Segments after evaluation of existing water quality data using the methodology for determining impairment identified in the Water Quality Control Policy for Developing California's Clean Water Act Section 303(d) List and the Functional Equivalent Document, both adopted by the Sate Water Resources Control Board in September 2004.

Once a water body is placed on the 303(d) List of Water Quality Limited Segments, it remains on the list until a TMDL is adopted and the water quality standards are attained or there are sufficient data to demonstrate that water quality standards have been met and delisting should take place.

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On April 28, 2017, the Santa Ana Regional Water Board adopted Order No. R8-2017-0013, Approval of Recommendations for the Federal Clean Water Act Section 303(d) List, with two Errata sheets.

Order No. R8-2017-0013 and related documents

The Regional Water Board staff submitted the water body fact sheets, responses to comments, and all other information the Regional Board considered during the hearing, to the State Water Resources Control Board (State Board).

On October 3, 2017 the State Board considered the Santa Ana Region's Integrated Report submittal along with the submittals from Regions 2, 3, 4, 5 and 9. The State Board approved the Santa Ana Region's Integrated Report submittal with three changes. The State Board did not approve the following Santa Ana Region actions:

  • The delisting of Chino Creek Reach 1B for Chemical Oxygen Demand (COD)
  • The delisting of Santa Ana River, Reach 3 for Copper
  • The delisting of Santa Ana River, Reach 3 for Lead

Now approved by the State Water Board, the Statewide 2016 List shall be submitted to U.S. EPA by the State Water Board for approval as required by the Clean Water Act.

Statewide Integrated Report Documents

 

Santa Ana Region's Past Approved 303(d) Lists of Water Quality Limited Segments

Additional Information on the 2006 303(d) List of Water Quality Limited Segments

Contact persons regarding the 303(d) List of Water Quality Limited Segments

If you have any questions or comments regarding the 303(d) List please contact Mark Smythe at (951) 782-4998.

To receive notifications by e-mail, subscribe on-line to our Impaired Waters 303(d) List, electronic mailing list.