This agreement provides funding to olivenhain municipal water district to implement its project to refine hydrogeologic modeling and treatment design criteria as part of the SAN dieguito valley…

Environmental Protection Agency Region 9 awarded a $959,752 Cooperative Agreement to Olivenhain Municipal Water District on December 16, 2025, to construct a new test well (La Valle Test Well) and conduct a pumping test at an existing well site (Hargis Well) as part of the San Dieguito Valley Brackish Groundwater Desalination Hydrogeologic Investigation Project, funded through the 2024 Consolidated Appropriations Act under the Congressionally Mandated Projects program (CFDA 66.202).

The project will install and operate the La Valle Test Well to enable ongoing sampling and analysis of groundwater, tracking changes over time, detecting potential contamination sources, and evaluating aquifer health. Data collected will inform decision-making for groundwater and water supply agencies regarding remediation efforts, water treatment options, and long-term water supply sustainability and safety.

The period of performance runs through June 30, 2027, with place of performance in Rancho Santa Fe, California. The obligated amount is $1,199,690. No sub-recipients are included in this assistance agreement.

This agreement provides funding to olivenhain municipal water district to implement its project to refine hydrogeologic modeling and treatment design criteria as part of the SAN dieguito valley brackish groundwater desalination hydrogeologic investigation project as directed in the 2024 consolidated appropriations act. This assistance agreement provides full federal funding in the amount of $959,752. See terms and conditions. Activities:the activities include constructing a new test well ('LA valle test well') and conducting a pumping test at an existing well site ('hargis well').subrecipient:no subawards are included in this assistance agreement.outcomes:the anticipated deliverables include installing and operating the test well allowing for ongoing sampling and analysis of groundwater to track changes over time, detect potential sources of contamination, and evaluate the overall health of the aquifer. The expected outcomes include providing data to inform decision-making for groundwater and water supply agencies, including remediation efforts, water treatment options, and long-term sustainability plans to ensure safe and reliable water supplies.