Create an Account - Increase your productivity, customize your experience, and engage in information you care about.
** These maps are best viewed on desktop computer, laptop, or tablet using Google Chrome, Safari, or Microsoft Edge.
Instructions for using the Interactive Maps and accessing the County's groundwater data (PDF)
Explore the geology and groundwater levels in your area with these interactive maps.
Learn about monitoring efforts in Napa County to promote groundwater and surface water sustainability and the important connections between them.