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Butte County reports wetter-than-average early water-year conditions and mixed groundwater trends
Summary
Butte County water staff reported above-average early-season precipitation on regional indices, Lake Oroville near average storage, and mostly small year-to-year changes in groundwater levels, while commissioners and public commenters urged more rigorous statistical trend analysis; the Commission approved its meeting calendar by voice vote.
Kelly Peterson, water resource scientist with the Butte County Water and Resource Conservation Department, updated the Water Commission on hydrologic conditions for the 2026 water year and on recent groundwater monitoring results.
Peterson said regional precipitation tracked above average early in the water year and reported local station totals near 11 inches; she noted the Northern Sierra 8-Station Precipitation Index was about 163% of average on a slide dated Nov. 21 and later measured near 117% with only slight additional rain after that slide. Peterson also reported Lake Oroville at about 51% of total capacity and near its historical average on the slide date, and she said the Department of Water Resources…
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