What is Being Done

Long-term, systematic monitoring is essential to provide data allowing for improved evaluations of water resource conditions and trends. Napa County has embarked on a countywide Groundwater Monitoring Program (PDF) to develop a sound understanding of groundwater conditions through groundwater monitoring and data management. The program has delineated the entire county into 17 subareas (PDF) based on geographic, geologic, and districts. These subareas provide a basis for the presentation of data and related reports. Overall, the Groundwater Monitoring Program will provide a foundation for future coordinated, integrated water resources planning and sharing of key water resources information.

Over the past several years, Napa County has developed a more focused understanding of the geology that controls the occurrence and availability of groundwater. With this updated geologic information and with assistance from community members serving on the Groundwater Resources Advisory Committee, the County expanded the number and distribution of wells that it monitors to improve the understanding of groundwater resources countywide. Between 2011 and 2015 the number of County monitored wells increased from 47 to nearly 100. In 2018, Napa County monitored 96 wells. Also, in 2018, DWR resumed monitoring efforts at four wells that had been suspended in response to multiple, large wildfires that burned in many areas around Napa Valley in October 2017. Part of the monitoring network expansion in recent years occurred through the construction of 10 dedicated monitoring wells at five sites in Napa Valley, designed specifically to provide data on the interactions between groundwater and surface water.

Despite the recent monitoring network expansion, there are additional areas where data are lacking and additional wells are needed to fill data gaps. To request more information on options for including your well in the County’s monitoring program, please contact Patrick Lowe, Napa County Natural Resources Conservation Manager, at (707) 259-5937

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