GAMA OnLine Tools
The State Water Board GAMA Program and the U.S. Geological Survey have created tools to help users understand groundwater quality in California. The following online tools allow users to access data through web maps and data querying tools.
Recommended browser is Google Chrome. If you have any problems when using these tools, please contact Dori Bellan.
- The GAMA Program’s online groundwater information system integrates and displays groundwater quality data from several different sources on an interactive Google-based map interface. This system provides access to approximately 87 million analytical results from over 290,000 wells in California. Analytical tools and reporting features help users assess groundwater quality and identify potential groundwater issues in California.
- Modern, shallow groundwater in California’s Central Valley can contain elevated concentrations of nitrate and other anthropogenic contaminants. As that water moves deeper into the aquifer, it moves into the zone tapped by wells that supply drinking water. This USGS web application presents a new model of the Central Valley that allows users to predict how this front of modern water will move deeper into the aquifer across the whole basin. It identifies the depth of water that was recharged before and after 1950 using multiple geochemical tracers collected from domestic and public drinking-water-supply wells. Outputs map how the modern/premodern interface moves in three dimensions through time. This study is a product of the statewide Groundwater Ambient Monitoring and Assessment Program-Priority Basin Project (GAMA-PBP), a cooperative partnership between the USGS and the California State Water Resources Control Board.
- The U.S. Geological Survey trends analysis tool allows the user to observe trends in 38 inorganic constituents from the GAMA Priority Basin Project, alongside the same inorganic constituents from the Division of Drinking Water public supply drinking water data. Several tools to analyze trends are included, as well as the ability to differentiate between statistically-significant increasing or decreasing trends, and trends dependent of well depth.
- The Aquifer Risk Map is an interactive web tool designed to identify areas of the state where domestic wells (serving less than five connections) and state small water systems (serving between 5 and 15 connections) may be at a relatively higher risk of accessing groundwater that does not meet primary drinking water standards. The aquifer risk map was developed to fulfill requirements included in Senate Bill 200 (Monning, statues of 2019) and is a component of California’s Safe and Affordable Funding for Equity and Resilience (SAFER) program. The primary purpose of this map interface is to inform Water Boards staff in support of the SAFER annual Fund Expenditure Plan. In accordance with SB 200, the Aquifer Risk Map will be updated on an annual basis. See the white paper presenting the methodology behind this map. See the SAFER program for additional information.
- This web application provides an online, publicly available, centralized location for ground and surface water spatial data. This includes groundwater source well locations, surface water intakes, vulnerability assessments, nearby potentially contaminating activities, and other data relevant to source water protection. The Division of Drinking Water is currently developing a tool to assess potentially contaminating activities at a defined distance, for purposes of creating a source water assessment.
- The U.S. Geological Survey has created the Groundwater Quality Results Mapping Tool. This interactive web map plots water-quality data from domestic and public-supply wells sampled by the USGS for the California GAMA Priority Basin Project, and allows users to download datasets.
- The GAMA Program’s publications are all available through the new GAMA Publications webmap. This interactive web map displays all published reports from GAMA projects, while also providing study unit information. Reference layers are also available for spatial comparisons.
- This tool is intended to provide a knowledge of relative groundwater age across California, using the tritium-helium dating technique employed by the GAMA Program work with the LLNL, previously published. It allows the user to analyze relative groundwater age of the tritium-containing groundwater (young portion) to observe vulnerability to groundwater contamination via recharge.
- This interactive tool is intended for private domestic well owners to evaluate if their well is near a 1,2,3-Trichloropropane-impacted well. Enter your address or point of interest into the search bar to locate impacted wells nearby. Additional information about 123-TCP is provided.
- This interactive tool is intended for private domestic well owners to evaluate if their well is near a nitrate-impacted well. Enter your address or point of interest into the search bar (top left) to locate impacted wells nearby. Additional information about nitrate is provided.
- As part of the Recycled Water Policy adopted by the State Water Board, agencies, municipalities, and local stakeholders are to develop salt and nutrient management plans (SNMPs) for groundwater basins in California. This webmap tracks the status of SNMP development.
Digitized Well Completion Reports - (Coming Soon!)
- Lead by the U.S. Geological Survey, the GAMA Program is digitizing well completion reports as we analyze the groundwater quality of shallow aquifers across California. Digitized data will include latitude/longitude, type of well, year completed, total depth, top of opening depth and number of openings, aquifer type, depth to static water level, including a link to the well completion report.