Groundwater Levels Show Significant Gains Over 25 Years The CoSANA groundwater model update revealed that the North American Sub-basin has gained approximately 600,000 acre-feet of groundwater storage since 1990—equivalent to more than half of Folsom Reservoir's capacity. Fall 2025 monitoring data shows water levels at or near historic highs across most representative monitoring sites, significantly exceeding minimum threshold requirements. This represents successful conjunctive use management, though staff noted one concerning trend: the Orangeville well continues showing a steady decline that requires further investigation.
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