The Napa County Groundwater Sustainability Agency oversees Groundwater Sustainability in the County. The Agency is also in charge of creating and carrying out a Groundwater Sustainability Plan (GSP)for the Napa Valley Subbasin. The Groundwater Sustainability Plan Advisory Committee (GSPAC) helped the Agency create the GSP.
The GSP includes policies and recommendations for taking care of and protecting groundwater within the Subbasin for the long term. The GSA submitted the adopted GSP to DWR for review on January 31, 2022.
Everyone in Napa County relies on groundwater. Rural residents and farms use groundwater. Groundwater also supports healthy watersheds. Napa County has been monitoring groundwater since the 1960s. In 2009, the monitoring work was expanded to provide a more complete picture of local conditions.