As an outgrowth of the Nitrogen/TDS Task Force, the agencies responsible for implementing the Basin Plan Amendments formed the Basin Monitoring Task Force, and SAWPA was identified to administer/facilitate that effort.
The Basin Monitoring Program Task Force was formed in August 2004 and consist of 20 water agencies Task Force members and the Santa Ana Regional Water Quality Control Board as an Advisory Member. The Task Force compiles and collects monitoring data to evaluate the water quality of the Santa Ana River on an annual basis, and the groundwater basins throughout the watershed every five years. The water agencies responsible for completing these tasks were included in the RWQCB Basin Plan as a result of the January 2004 Nitrogen and Total Dissolved Solids Basin Plan Amendment.
The Task Force is administered by SAWPA and meets bi-monthly. The primary work tasks include the following:
Preparation of an annual water quality report for the Santa Ana River Reaches 2, 3, 4 & 5 necessary to assure compliance with both surface water objectives of the defined river reaches.
Preparation of a watershed-wide TDS/Nitrogen ambient water quality update every five years to determine the current ambient groundwater quality in the watershed for TDS/Nitrogen.
The Task Force has also led past updates of the Santa Ana River waste load allocation model. In short, waste load allocations distribute a share of total TDS and Nitrogen wasteloads to each of the publicly owned treatment works (POTWs) that discharge treated wastewater to the Santa Ana River and its tributaries.
These reports fulfill the requirement to prepare an Annual Report of Santa Ana River Water Quality pursuant to the 2004 Basin Plan Amendment. Contained within these reports are water quality data required to implement the surface water monitoring program necessary to determine compliance with the nitrogen and TDS objectives of the SAR and, thereby, the effectiveness of the wasteload allocations.
Recomputation of Ambient Water Quality (AWQ) Reports
As part of the agreement to adopt the 2004 Basin Plan amendment, the Task Force has agreed to recompute ambient water quality for individual management zones every five years. The determination of current ambient quality shall be accomplished using methodology consistent with that employed by the TIN/TDS Taskforce (20-year running averages) to develop the TDS and Nitrate water quality objectives included in the 2004 Basin Plan.
Santa Ana River Wasteload Allocation Model (WLAM) Reports
Wasteload allocations for regulating discharges of TDS and total inorganic nitrogen (TIN) to the Santa Ana River, and thence to groundwater management zones recharged by the River, are an important component of salt management for the Santa Ana Basin.
2019 Santa Ana River Wasteload Allocation Model Summary Report
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