Groundwater Sustainability Planning

The 2014 Sustainable Groundwater Management Act (SGMA) provides a framework for sustainable management of groundwater resources by local authorities. The act provides a timeline (PDF) – 20 years – to implement actions that achieve long-term groundwater sustainability. It protects existing surface water and groundwater rights and does not impact current drought response measures. The California Department of Water Resources (DWR) is in charge of the SGMA Program and has developed guidelines for local agencies to follow. DWR has also prepared a SGMA brochure (PDF) to explain the requirements under the Act. Napa County is currently working towards meeting the requirements of the SGMA. A good summary of the SGMA can be found on the Association of CA Water Agencies website.

SGMA Requirements

The County and its groundwater consultant have completed work to meet the requirements of SGMA, which was in the form of a Basin Analysis Report (one of the Alternatives to a Groundwater Sustainability Plan defined in the Act). This report, Napa Valley Groundwater Sustainability - Basin Analysis Report for the Napa Valley Subbasin, provides an extensive analysis of the basin and demonstrates it has operated within its sustainable yield and that it is being managed consistent with the goal of SGMA and DWR regulations.

For medium and high priority groundwater basins/subbasins, a Basin Analysis Report or other Alternative must be submitted to DWR by January 1, 2017. The Napa Valley Subbasin (map (PDF)) is the only basin in Napa County with a medium priority ranking by DWR that is subject to SGMA at this time.

Basin Analysis Report

A Basin Analysis Report for the Napa Valley Subbasin was presented to the Board of Supervisors at a Special Meeting on December 13, 2016. At that meeting, the Board approved the report and its submittal to DWR. The Report was submitted to DWR on December 16, 2016. DWR is currently reviewing the Basin Analysis Report, with their comments and recommendations expected by early 2018. See DWR's SGMA Portal for Alternatives and Reporting for additional information and updates. A hard-copy of the report is available for review at the Napa County Flood Control and Water Conservation District office, 804 First St., Napa, (707) 259-8600. An electronic copy of the report is available below.