Groundwater Sustainability

  1. Welcome
  2. Groundwater Planning
  3. Calendar


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.

Has your well run dry? Report it here

Napa County Well Permit Standards (including response to Governor’s Executive Order N-7-22)

Well Permit Standards and WAA Requirements – Jan 6, 2023
Figure 1: Significant Streams for Tier 3
Figure 1-1: Napa Valley Subbasin map
Water Availability Analysis (WAA), May 12, 2015

NEW: California's Groundwater Semi-Annual Conditions Updates - October 2023