Napa County supervisors are immersing themselves in groundwater issues that have implications for both Napa Valley vineyards and the Napa River.

The topic is the Napa Valley subbasin that holds groundwater beneath the valley floor from north of Calistoga to south of the city of Napa. Groundwater irrigates world-famous vineyards. It also feeds streams and the Napa River during hot summer months.

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