TO: Technical Advisory Group for the Napa County Groundwater Sustainability Agency (NCGSA)
FROM: Brian D. Bordona - Director of Planning, Building and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Technical Advisory Group Meeting: March 13, 2025
RECOMMENDATION
title
Receive a presentation on the Water Year 2024 Annual Report model results and an update on groundwater conditions in Napa County with a focus on the Napa Valley Subbasin and an update on Groundwater Sustainability Plan implementation.
Procedure
Staff introduces.
Questions and answers with the TAG.
Public comments.
body
EXECUTIVE SUMMARY
As in the past ten consecutive annual reports, this Water Year 2024 Annual Report includes an update on groundwater conditions in the Napa Valley Subbasin and elsewhere in Napa County. This is the fourth Annual Report prepared to support implementation of the Napa Valley Subbasin Groundwater Sustainability Plan (GSP), adopted by the Napa County Groundwater Sustainability Agency (NCGSA) in January 2022 and approved by the California Department of Water Resources (DWR) on January 26, 2023. This Report reflects an ongoing commitment by the County and NCGSA to sustainably manage groundwater resources by implementing an adaptive management approach supported by best available information.
Water Year 2024 (defined as October 1, 2023 through September 30, 2024) was characterized by a cool wet spring with an extremely hot, dry summer. The Napa Valley Subbasin was characterized by severe drought conditions in Water Years 2020 and 2021 with recovery occurring in normal (below average) and wet Water Years in 2022 and 2023, respectively. Water Year 2024 had consistent precipitation throughout the winter and spring, starting in October 2023 and continuing through May 2024 with a total of 22.94 inches of rain measured at the Napa State Hospital. The average precipitation is 24.87 inches per year, and Water Year 2024 was cl...
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