Basin Plan - Triennial Review

Santa Ana Region Salt Management Plan

On January 22, 2004, the Santa Ana Regional Water Quality Control Board adopted Basin Plan Amendment (Resolution No. R8-2004-0001). The Amendment updated the groundwater basin boundaries, and water quality objectives of total dissolved solids (TDS) and nitrogen (N). The updated Basin Plan also incorporated a revised salt and nitrogen management plan, which included revised nitrogen and TDS waste load allocations for discharges to the Santa Ana River and its tributaries, revised findings regarding assimilative capacity in ground water, and a plan for wastewater reclamation in the Region. To accommodate the reclamation projects in the Region, alternative water quality objectives, "Maximum Benefit" objectives were established in some groundwater basins. In return, the series of commitments of salt removals and monitoring programs to ensure that the beneficial uses of the ground water basins are protected.

The State Water Resources Control Board (State Water Board) and Office of Administrative Law (OAL) approved the Amendment on September 30, 2004 and December 23, 2004, respectively. The surface water standards provisions of the Amendment were approved by the U.S. Environmental Protection Agency on January 20, 2007.

The technical analyses that supported the Amendment were funded by N/TDS/Task Force, a stakeholder group in the watershed. The deliverables included technical memorandums, GIS layers that delineate groundwater basins, and contour maps of nitrogen and TDS concentrations.

Regional Board staff review and approve the monitoring programs and review monitoring data. Please contact Cindy Li at (951) 782-4906 if you want receive any of the data or reports.

On August 4, 2017, the Regional Board conducted a public hearing and approved the Basin Plan Amendment to Revise the Water Quality Objective for Nitrate-Nitrogen in the Chino-South Groundwater Management Zone.

On February 6, 2018 the State Water Board approved the Basin Plan Amendment through Resolution No. 2018-0004. As part of the State Water Board approval process, a Notice of Opportunity to Comment was posted on December 6, 2017. Below is the link for this Notice. The next step in the process is to seek approval by OAL.

Revised - Extension of Public Comment Period, Notice of Opportunity to Comment

Notice of CEQA scoping meeting regarding Development of a Basin Plan Amendment to Incorporate Updates to the Total Dissolved Solids and Nitrogen Management Plan for the Santa Ana Region


New Consideration of Acceptance of the 2015 TDS and Nitrate-Nitrogen Groundwater Management Zones Ambient Water Quality Determinations – Resolution No. R8-2018-0027 (to be adopted at the March 23, 2018 Regional Board meeting)


Final Report for the Triennial Ambient Water Quality in the Santa Ana River Watershed for the Period 1996 to 2015 (September 2017)


Salt Management Plan Past Activities


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