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 – 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 developed a SGMA website to explain the requirements under the Act. Napa County is currently meeting the requirements of the SGMA.
DWR completed its evaluation and re-prioritization of all of the groundwater basins across California, which was finalized in January 2019. The Napa Valley Subbasin was reprioritized from a medium to a high priority ranking due primarily to revised projections of future population for the Subbasin, an increased assessment of the total number of wells, and a revised approach to evaluating water quality in the Subbasin. The change from a medium y to a high priority does not affect current requirements for the Napa Valley Subbasin under SGMA. DWR has noted that the Napa Valley Subbasin is being managed sustainably and it is not in overdraft.
For groundwater basins or Subbasins given a medium or high priority ranking by DWR, SGMA provided an option for local agencies to submit a Basin Analysis Report or other Alternative GSP to DWR by January 1, 2017. The Napa Valley Subbasin (map) is the only basin in Napa County with a priority ranking by DWR that is subject to SGMA at this time.
Groundwater Sustainability Planning
In accordance with SGMA and adopted GSP regulations, Napa County submitted an alternative GSP (Napa Valley Groundwater Sustainability: A Basin Analysis Report for the Napa Valley Subbasin) to DWR on December 16, 2016. On July 17, 2019, DWR sent a notification letter and staff report to Napa County outlining DWR’s preliminary recommendation to not approve the County’s alternative GSP.
DWR’s staff report did not consider and does not conclude that the Napa Valley Subbasin is, or has been, managed unsustainably. DWR’s preliminary staff recommendation centers on the evaluation that Napa County did not establish and operate the subbasin to thresholds or objective management criteria for a period of at least 10 years prior to the adoption of SGMA. On October 11, 2019, Napa County provided a response to DWR to address their questions and other requested clarifications regarding the alternative GSP.
On November 13, 2019 DWR notified Napa County that it had finally completed its review of the County's Alternative GSP and the County's responses. While recognizing that Napa County is proactively managing groundwater, DWR nonetheless elected not to approve the County's Alternative GSP. DWR's decision was not a judgment on the health or management of the basin, as noted in DWR's findings. In fact, DWR clarified that its decision was not an indication that the Napa Valley Subbasin is being managed unsustainably, but rather commended the County for proactively managing groundwater. Please see DWR's SGMA Portal for Alternatives and Reporting for additional information.
As a result of DWR's decision, a Groundwater Sustainability Agency (GSA) was required to be formed for the Napa Valley Subbasin in order to be in compliance with SGMA and DWR regulations, otherwise the Subbasin would be deemed "unmanaged." If a GSA is not formed, the State Water Resources Control Board (SWRCB) would be obligated to step in to monitor and manage the Subbasin and groundwater users. The SWRCB could require all groundwater users within the Subbasin to install meters, report extractions, and pay fees to cover State costs.
On Tuesday, December 17, 2019, the Napa County Board of Supervisors conducted a public hearing under Water Code section 10723 and adopted a resolution affirming Napa County's intention to manage groundwater in the Napa Valley Subbasin and to form the Napa County Groundwater Sustainability Agency pursuant to Water Code section 10724, and authorized the submittal of GSA Formation Information to DWR. Water Code section 10724 provides that the County is presumed to be the GSA for the areas in the Subbasin that are "unmanaged" (not within the management a GSA). SGMA requires the County to give notice to DWR that it intends to undertake sustainable groundwater management and serve as the GSA in the "unmanaged" areas. DWR's SGMA website portal provides local agencies, GSA's, and watermasters the ability to submit, modify, and view the information required by SGMA, and enables the public and interested stakeholders to view submitted information and provide comments, where applicable. No login is required for public access.
A hard-copy of the GSP Alternative 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 on Napa County’s Watershed Information and Conservation Council (WICC) website.
Annual Monitoring and Reporting
SGMA requires annual reporting on groundwater conditions and on any actions taken by Napa County to ensure the sustainable management of Napa Valley groundwater resources. The 2017 and 2018 Annual Groundwater Reports are available on https://www.napawatersheds.org/groundwater-monitoring. The reports describe groundwater conditions in the Napa Valley Subbasin and provide an update on the County’s SGMA implementation efforts through water year 2018, as required by SGMA and DWR. Additionally, the 2017 Annual Report includes an Amendment to the 2016 Alternative GSP/Basin Analysis Report, establishing a Northeast Napa Management Area (PDF). The Amendment complements the management actions in the 2016 Alternative GSP/Basin Analysis Report for the Napa Valley Subbasin and enables continued attainment of the SGMA Sustainability Goals for the Napa Valley Subbasin.
Annual reports developed for SGMA purposes are required to be submitted to DWR by April 1 of each year following adoption of a GSP or Alternative GSP (Regulations Section 356.2). Napa County submitted the 2018 Annual Report to DWR on March 22, 2019 after public notice and presentation at a public meeting of the Board of Supervisors on March 22, 2019.