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Councilmember Hardy summarizes groundwater modeling, says 10% pumping reduction would meet plan goals in many scenarios

City Council of Saint Helena · October 29, 2025
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Summary

Councilmember Hardy reviewed GSA and state supply-and-demand materials, reporting baseline pumping averages, drought-period increases, and model runs showing a 10% reduction—if achieved countywide and in 1,500-foot stream buffers—reduces threshold exceedances in model scenarios.

Councilmember Hardy provided a technical briefing on the Napa Valley Groundwater Sustainability Agency process and the State Water Resources Control Board's supply-and-demand assessment content. Hardy said the GSA consultants analyzed recharge options and new modelling features that evaluate reductions in pumping in zones near significant streams.

Hardy cited model numbers: a 2005'2014 base-period average pumping of about 15,000…

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