2023 Annual Water Quality Report Confirms High Quality of Zone 7 Water

LIVERMORE, Calif. – Zone 7 Water Agency released its 2023 Annual Water Quality Report confirming all water supplied by the agency in 2023 met the regulatory standards set by the state and federal governments. Furthermore, in almost all cases, the water quality was significantly better than required.
“We encourage the businesses and residents of Tri-Valley to review our latest Water Quality Report and see how we ensure the high quality of our drinking water, providing safe, clean, and sustainable water to our community,"” said Zone 7 General Manager Valerie Pryor. “We have invested in state-of-the-art monitoring and treatment systems – and we have been proactive in investing in upgraded facilities, leveraging millions in grant funding to maintain our high standards.”
Residents of the Tri-Valley can now read the report online detailing the sources, treatment, safety, and testing of their local water along with illustrated graph results and infographics.
 The Consumer Confidence Report is available for download through the Zone 7 website, https://www.zone7water.com/post/annual-water-quality-reports.
Highlights of the 2023 Water Quality Report include:

  • 2023 Water Quality Testing Results – This section provides information on levels of contaminants detected in the water supply. Thanks to rigorous source water protection, testing and treatment programs, Zone 7 met or performed better than all standards for drinking water in 2023.
  • Source Water Assessment – This section lists the primary sources of water for Zone 7 Water Agency, which draws from a diverse portfolio of drinking water sources, including local and imported surface water as well as groundwater from wells.
  • Stoneridge Grant – This section recounts the California Department of Water Resources Sustainable Groundwater Management Grant Program awarding Zone 7 Water Agency a $16 million grant for development of the Stoneridge Well Ion Exchange (IX) PFAS Treatment facility. The new facility successfully removes Per- and Polyfluoroalkyl substances (PFAS) from groundwater pumped from the facility and is the first of its kind to offer IX PFAS removal in Northern California.
  • Proactively addressing PFAS This section includes information on how Zone 7 is addressing and handling PFAS concerns. On April 10, 2024, the U.S. Environmental Protection Agency (EPA) announced final maximum contaminant levels (MCLs) for six PFAS substances. Though we are not required to meet these new MCLs for five years, because of Zone 7’s commitment to delivering a safe and reliable water supply to our customers, we have voluntarily made changes to our operations to meet the MCLs now.
 Zone 7 delivers treated drinking water to four major water retailers, along with a small number of direct customers, serving over a quarter million people in Pleasanton, Livermore, Dublin, and the Dougherty Valley area of San Ramon. Zone 7 also provides untreated water to local agricultural users and owns and maintains 37 miles of local flood-protection channels, about a third of all the Valley’s channels and creeks.
Additional questions on water quality may be directed to the Zone 7 water quality team at [email protected].
About Zone 7 Water
Zone 7 Water Agency is one of the 10 active zones of the Alameda County Flood Control and Water Conservation District. The District was established by the State Legislature in October 1949 to solve problems of flooding, drainage, channel erosion and water supply and conservation in Alameda County. In 1957, by popular vote, Zone 7 became a special district governed by a seven-member board of directors. Along with flood protection, Zone 7 supplies water to all of eastern Alameda County and a population of over a quarter million residents. Treated water is sold wholesale to local retailers, including the cities of Livermore and Pleasanton, the Dublin San Ramon Services District, and the California Water Service Company. Zone 7 also distributes untreated water to local agriculture operations and golf courses.