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GAMA – Groundwater Ambient Monitoring & Assessment Program

The Groundwater Ambient Monitoring and Assessment (GAMA) Program is California's comprehensive groundwater quality monitoring program.

GAMA collects data by comprehensively testing groundwater sources for naturally occurring and man-made chemicals. GAMA compiles these test results with existing groundwater quality data from several agencies into a publicly accessible information system, GeoTracker GAMA.

GAMA - Providing a Better Understanding of California’s Groundwater

Over 36 million California residents get their water from a safe to drink public source, while nearly 2 million are served either by a private domestic well or smaller water systems (less than 15 service connections). Private domestic well owners are encouraged to test their well water quality regularly.

Nine out of ten public water systems rely on groundwater for at least a portion of their supply. Contaminated groundwater often results in treatment, well closures, or new well construction, which increases costs for consumers.

California is very reliant on groundwater supplies. Having access to safe, clean water is critical to sustain society, the environment, business, industry, and agriculture. Comprehensively monitoring groundwater quality under the GAMA Program is an important part of managing our water resources.

GAMA Program Background

The GAMA Program was created by the State Water Board in 2000. It was later expanded by Assembly Bill 599 - the Groundwater Quality Monitoring Act of 2001. The main goals of the GAMA Program are to:

  • Improve statewide groundwater monitoring
  • Increase availability of groundwater quality information to the public

Fact Sheets


Visit the links on this page to learn more about the GAMA program and groundwater quality. Contact us at GAMA@waterboards.ca.gov or call (916) 341-5585 with questions or comments.