New Monitoring Well at Ken Mercer Sports Park


In a continuing effort to supply the Tri-Valley with safe, reliable water that surpasses state and federal drinking water standards, Zone 7 is installing an additional monitoring well to serve as an early detection system for Per- and Polyfluoroalkyl substances (PFAS) for the neighboring water supply wells in the area.

Keeping Your Groundwater Safe

Zone 7 is the Groundwater Sustainability Agency for the Livermore Valley Groundwater Basin. As part of the groundwater basin management we maintain a groundwater monitoring network of over 200 wells. The wells are used to assess groundwater elevations and water quality.  

The need for a new monitoring well to act as a sentinel well for the supply wells located adjacent to the sports park was identified. This monitoring well location will act as an early warning system to detect any PFAS in the groundwater before they reach the drinking water supply wells.

More information on Zone 7’s groundwater basin management is available on our website:

Project Location and Information
  • Project is located within the parking lot in the northeastern portion of the Ken Mercer Sports Park.
  • The project is expected to take approximately 3 weeks.
  • Temporary construction fencing will be installed around the drill rig and equipment for public safety.
  • The sidewalks and fields will not be impacted by the construction activities and will be available based on the normal seasonal operations by the City of Pleasanton.
  • Zone 7 will do its best to minimize construction impacts as much as practical and in accordance with County and City ordinances.
  • Please be aware of construction activities over the duration of the construction period and please use caution while traveling in this area.
  • Expect typical construction noise during work hours (Monday - Friday, 8 am – 5 pm).
Contact Our Project Team

Please contact Project Manager Colleen Winey at (925) 454‐5063 or with any concerns. We appreciate your patience throughout the construction of this project as we work to ensure the safety of your groundwater. 

  • All water supplied to our customers meets the regulatory standards set by the state and federal governments. 
  • In almost all cases, the quality was significantly better than required. 
  • Zone 7 continues to deliver all water below the California Division of Drinking Water’s response levels for PFAS.
  • For more information about how we keep your water safe from PFAS click here.