Groundwater Benefit Zone Study | Santa Clara Valley Water
FYI 10/16/19 | 8:17 AM: Applications for Water 101 Academy now available! Be a Water Champion and learn about all things water impacting our region, as well as current and future water projects in your community. Apply by Oct. 25
Your Water
Ensuring safe, reliable water
Your Water
Page Title
Your Water
Back to top

Groundwater Benefit Zone Study


Valley Water protects and replenishes local groundwater supplies to ensure water supply reliability for Santa Clara County. Management of the sustainable groundwater supply is funded by groundwater charges, which are applied to groundwater pumpers within zones benefiting from Valley Water activities. These activities include replenishing groundwater with local and imported surface water, monitoring and protecting groundwater from pollutants, and constructing, operating, and maintaining facilities that help sustain groundwater supplies.

Valley Water conducted a study to evaluate the extent of these benefit zones to ensure they accurately reflect the areas receiving benefit from Valley Water activities to protect and replenish groundwater. The study did not evaluate the rates that are charged within the benefit zone. This study provided Valley Water with a scientific, transparent basis for proposing changes to the current benefit zones, if necessary.

Groundwater Benefit Zone Map Web App

To better understand the potential changes to your area, please use the Groundwater Benefit Zone Map Web App.

How to participate

The community is invited to provide input into the Groundwater Benefit Zone Study throughout the process. Feedback received will be provided to the Valley Water Board of Directors.

In April 2019, we provided information on our scientific study of groundwater benefit zones. We also hosted open houses and invited you to contact us to learn how the proposed changes may affect you. Valuable input and site-specific information from owners or operators of groundwater wells (Well Users) led us to revisit the study’s technical data (click link or see below for updated study dated August 2019) and amend the recommendations for proposed zones. Last month, we provided an update encouraging everyone to view our updated Groundwater Benefit Zone Web App or to contact us for the latest information.

Staff presented these amended recommendations to the Valley Water Board of Directors at their August 27, 2019 regular meeting. During this meeting, the Board requested staff provide an additional month for public comments. The Board will consider the staff recommendations at their Tuesday, October 8, 2019 regular meeting. 

Information on the October 8, 2019 Board meeting, including location, time, how to provide comment, an online video livestream link and all materials related to this agenda item 5.1 are available at:

If the Board adopts new or modified zones, the Well Users that must pay groundwater charges may change. The rates within zones could also change with slightly higher rates in some zones and reduced rates in others. In any case, groundwater users would pay a fair, equitable rate based on the benefits received. Valley Water’s overall revenue would not increase because of this process.