1. Groundwater Levels in the Eastern Sub-Basin Are Declining Again — Minimum Threshold Exceedances Crossed the 33% Mark for the First Time Since Fall 2022 After a below-normal water year (WY 2025), 35% of monitoring wells in the Eastern Principal Aquifer and 38% along the Stanislaus River fell below minimum thresholds during the Fall 2025 monitoring event. This does not yet trigger "undesirable results" — that requires three consecutive fall events above the threshold — but it is a warning signal. Wells in the easternmost sub-basin declined 12–17 feet between Spring 2021 and Fall 2025, and the first-ever interim milestone exceedance was recorded at monitoring well MW-10.
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