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GAMA – Groundwater Ambient Monitoring & Assessment Program
Groundwater Reports
Reports, tables, and links pertinent, or related to, groundwater quality in the State of California.
GAMA Program Fact Sheets
- GAMA Program Fact Sheet
- GeoTracker GAMA Fact Sheet
- Groundwater Fact Sheet
- GAMA Domestic Well Project Fact Sheet
GAMA Reports – Priority Basin Project
Data Summary Reports (DSR):
- Groundwater-Quality Data in the Western San Joaquin Valley Study Unit, 2010: Results from the California GAMA Program
- Groundwater-Quality Data in the Cascade Range and Modoc Plateau Study Unit, 2010: Results from the California GAMA Program
- Borrego Valley, Central Desert, and Low-Use Basins
- Northern Coast Ranges
- North Sacramento Valley
- Middle Sacramento Valley
- Southern Sacramento Valley
- North San Francisco Bay
- San Francisco Bay
- Salinas/Monterey
- Madera/Chowchilla
- North San Joaquin Valley
- Central Eastside San Joaquin Valley
- Southeast San Joaquin Valley
- Kern County
- Sierra Regional
- Central Sierra
- Tahoe/Martis
- Southern Sierra
- Owens/Indian Wells
- Mojave Valley
- Coachella Valley
- Antelope Valley
- Colorado River
- Santa Clara River Valley
- Upper Los Angeles Basin
- Coastal LA Basin
- Upper Santa Ana
- South Coast Ranges - Coastal
- South Coast Interior
- San Diego
- Status of Groundwater Quality in the California Desert Region, 2006-2008: California GAMA Priority Basin Project
- Status and Understanding of Groundwater Quality in the San Francisco Bay Groundwater Basins, 2007: California GAMA Priority Basin Project
- Status and Understanding of Groundwater Quality in the Madera-Chowchilla Study Unit, 2008: California GAMA Priority Basin Project
- Status of groundwater quality in the Coastal Los Angeles Basin
- Status of Groundwater Quality in the Upper Santa Ana Watershed
- Status and Understanding of Groundwater Quality in the two Southern San Joaquin Valley Study Units
- Status and Understanding of Groundwater Quality in the Tahoe-Martis, Central Sierra, and Southern Sierra Study Units, 2006-2007, California GAMA
- Status of Groundwater Quality in the San Fernando–San Gabriel Study Unit, 2005: California GAMA Priority Basin Project
- Status and Understanding of Groundwater Quality in the San Diego Drainages Hydrogeologic Province
- Status and Understanding of Groundwater Quality in the Monterey Bay and Salinas Valley Basins
- Status and Understanding of Groundwater Quality in the Santa Clara River Valley
- Status of groundwater quality in the Southern, Middle, and Northern Sacramento Valley study units
- Status and Understanding of Groundwater Quality in the Northern San Joaquin Basin, 2005: California GAMA Priority Basin Project
- Status and Understanding of Groundwater Quality in the Central-Eastside San Joaquin Basin
- Status and Understanding of Groundwater Quality in the North San Francisco Bay Groundwater Basins
Fact Sheets:
- Groundwater Quality in the Antelope Valley, California
- Groundwater Quality in the Coachella Valley, California
- Groundwater Quality in the Colorado River Basins, California
- Groundwater Quality in the Indian Wells Valley, California
- Groundwater Quality in the Mojave Area, California
- Groundwater Quality in the Owens Valley, California
- Groundwater Quality in the San Francisco Bay Groundwater Basins, California
- Groundwater Quality in the Coastal Los Angeles Basin, California
- Groundwater Quality in the Kern County Subbasin
- Groundwater Quality in the Southeast San Joaquin Valley
- Groundwater Quality in the Central Sierra Nevada
- Groundwater Quality in the Southern Sierra Nevada
- Groundwater Quality in the Tahoe and Martis Basins
- Groundwater Quality in the Upper Santa Ana Watershed
- Groundwater Quality in the San Fernando–San Gabriel Groundwater Basins (Upper LA Basin)
- Groundwater Quality in the San Diego Drainages Hydrogeologic Province
- Groundwater Quality in the Monterey Bay and Salinas Valley Groundwater Basins
- Groundwater Quality in the Santa Clara River Valley, California
- Groundwater Quality in the Northern Sacramento Valley
- Groundwater Quality in the Middle Sacramento Valley
- Groundwater Quality in the Southern Sacramento Valley
- Groundwater Quality in the North San Francisco Bay Groundwater Basins, California
- Groundwater Quality in the Northern San Joaquin Valley, California
- Groundwater Quality in the Central Eastside San Joaquin Valley, California
- USGS GAMA Program Fact Sheet
Journal Articles:
- Geogenic Sources of Benzene in Aquifers Used for Public Supply, California, Matthew K. Landon and Kenneth Belitz
- Estimation of aquifer scale proportion using equal area grids: Assessment of regional scale groundwater quality
- Occurrence and concentrations of pharmaceutical compounds in groundwater used for public drinking-water supply in California
- Assigning land use to supply wells for the statistical characterization of regional groundwater quality: Correlating urban land use and VOC occurrence
- Effects of Ground-Water Development on Uranium: Central Valley, California, USA
- Relations of hydrogeologic factors, groundwater reduction-oxidation conditions, and temporal and spatial distributions of nitrate, Central-Eastside San Joaquin Valley, California, USA
- Factors Controlling the Regional Distribution of Vanadium in Groundwater
- Probability of Detecting Perchlorate under Natural Conditions in Deep Groundwater in California and the Southwestern United States (Fram, Belitz - USGS)
- USGS GAMA Publications
GAMA Reports – Domestic Well Project
- El Dorado County Summary Report
- San Diego County Summary Report
- Tehama County Summary Report
- Tulare County Summary Report
- Yuba County Summary Report
- Tables and Selected Maps for County Focus Areas available at the Domestic Well Project page
GAMA Reports – Special Studies Project
White Paper on GAMA Special Studies:
Project Reports:
- Source Determination of Nitrate in Groundwater using Nitrogen, Oxygen, and Boron Isotopes: San Diego County GAMA Domestic Well Project
- Stable isotopic composition of boron in groundwater - analytical method development
- California GAMA Special Study: Nitrate Fate and Transport in the Salinas Valley
- California GAMA Domestic Wells: Nitrate and Water Isotopic Data for Tulare County
- California GAMA Program: Development of a Field Deployable Dissolved Gas Extraction Apparatus
- California GAMA Special Study: Ion exchange and trace element surface complexation reactions associated with applied recharge of lowTDS water in the San Joaquin Valley, California
- California GAMA Special Study: An isotopic and dissolved gas investigation of nitrate source and transport to a public supply well in California's Central Valley
- Impact of Artificial Recharge on Dissolved Noble Gasses in Groundwater in California
- Evaluation of Noble Gases Recharge Temperatures in a Shallow Unconfined Aquifer
- Tracking Water Quality Changes during Groundwater Banking at Two Sites in San Joaquin County
- Impact of Dairy Operations on Groundwater Quality
- Fate and Transport of Wastewater Indicators: Results from Ambient Groundwater and from Groundwater Directly Influenced by Wastewater
- Sources and Transport of Nitrate in Shallow groundwater in the Llagas Basin of Santa Clara County, California
- Denitrification in a Shallow Aquifer Underlying a Dairy Farm: New Approaches to Characterization and Modeling
- Sources and Transport of Nitrate in Groundwater in the Livermore Valley Basin, California: An Integrated Approach to Basin Assessment and Resource Protection
- Interpretation of Tritium-3Helium Groundwater Ages and Associated Dissolved Noble Gas Results from Public Water Supply Wells in the Los Angeles Physiographic Basin
- Genetic Detection of Endocrine Disrupting Chemicals in Ambient Water
- California GAMA Special Study: Interpretation of Isotopic Data in the Sonoma Valley, California
- California GAMA Special Study: Groundwater Age Simulation and Deconvolution Methods for Interpretation of 3H- 3He Data
- California GAMA Domestic Wells Data Report: Water and Nitrate Isotopic Data for San Diego County
GAMA in the News
- State Water Board Releases GeoTracker GAMA Interactive Groundwater Quality Website
- Groundwater survey floats good news for North Coast area, January 28, 2011
- South S.J. wells tapping into a few hot spots, October 1, 2010
- High concentrations of arsenic found in 9 percent of northern San Joaquin Valley groundwater, September 29, 2010
- State's Nitrates Problem Grows Unchecked, May 17, 2010
- Merced County's Groundwater Gets Clean Bill of Health -- for the Most Part, Merced Sun-Star, April 15, 2010
- Scientists find ancient water in the Sierra, January 12, 2010
- Initial findings of water quality study discussed, December 17, 2009
- Sacramento Bee Report on Central Valley Water Quality, August 19, 2009
- Water Quality Tests Defined Emerging Trends, McKinleyville Press, July 2009
- The Water Down Below, Eureka Times - Standard, July 19, 2009
- Study: Local water quality ranks among cleanest in state, December 12, 2008
- Tulare County Dairies and Wells, Sacramento Bee, February 2008
- Tests Show Traces in Groundwater, Bakersfield Californian, May 2007
- Tulare County Private Wells Test High for Nitrates, Visalia Times Delta, November 2006
- CA Sets the Stage for Comprehensive Groundwater Management, Tim Parker
- USGS GAMA Press Releases
Other Groundwater Reports
Many other groups, including non-profit environmental advocacy groups, university researchers, and others have prepared reports related to groundwater quality in California. A selection of these reports is available below:
- California’s Contaminated Groundwater (Natural Resources Defense Council - NRDC)
- Effects of Groundwater Development on Uranium: Central Valley, California (National Ground Water Association - NGWA)
- Factors Controlling the Regional Distribution
of Vanadium in Groundwater (NGWA)
- USGS Develops New Field Method for Detecting Chromium VI in Ground Water (2003)
- Where Does My Water Come From? (Water Education Foundation)
Assembly Bills and Related Reports
- Federal Clean Water Act - 2002 CWA Section 305(b) Report
- SWRCB Ambient Monitoring Plan - Monitoring Plan (SWAMP and GAMA, 2000)
- AB 599 – The Groundwater Quality Monitoring Act of 2001 - Complete text of chaptered bill
- SWRCB Report to the Governor and Legislature: A Comprehensive Groundwater Quality Monitoring
Program for California
- AB 2021 Reports – See Department of Pesticide Regulation below
- 1988 Report to Legislature - Nitrate in Drinking Water
- AB 2222 - Groundwater Information Accessibility and Identification of Communities Reliant on Contaminated Groundwater
California Aquifer Susceptibility (CAS) Project
California Aquifer Susceptibility Assessment:
Lawrence Livermore National Laboratory CAS Reports:
- Groundwater Age Dating from Public Water Supply Wells in the Los Angeles Physiographic Basin
- A Contamination Vulnerability Assessment for the Livermore-Amador and Niles Cone Groundwater Basin
- A Contamination Vulnerability Assessment for the Sacramento Area Groundwater Basin
- A Contamination Vulnerability Assessment for the Bakersfield Area
- A Contamination Vulnerability Assessment for the Santa Clara and San Mateo County Groundwater Basins
- California GAMA Program: Groundwater Ambient Monitoring and Assessment Results for the Sacramento Valley and Volcanic Provinces of Northern California
USGS CAS Reports:
- Low Level Volatile Organic Compounds in Active Public Supply Wells as Ground-Water Tracers in the Los Angeles Physiographic Basin, California
- Stable Isotopes and Volatile Organic Compounds Along Seven Ground-Water Flow Paths in Divergent and Convergent Flow Systems, Southern California, 2000
- Assessing the Susceptibility to Contamination of Two Aquifer Systems Used for Public Water Supply in the Modesto and Fresno Metropolitan Areas, California 2001 and 2002
- Evaluation of Volatile Organic Compounds in Two Mojave Desert Basins – Mojave River and Antelope Valley – in San Bernardino, Los Angeles, and Kern Counties, California, June-October 2002
Water Quality Criteria Tables
The State Water Resources Control Board Compilation of Water Quality Goals:
- A new 16th Edition of the staff report “A Compilation of Water Quality Goals” dated April 2011, has been released. Please cease using earlier editions of this report and earlier versions of the Water Quality Goals tables, as they contain outdated information.
- Water Quality Goals Staff Report
California Department of Public Health:
- CDPH Chemicals and Contaminants in Drinking Water Web Page
- Comparison of Federal and California Primary Drinking Water Standards
- Drinking Water Regulations and Statutes
GAMA Presentations
Department of Water Resources
- DWR Bulletin 118 - The Department of Water Resources publishes descriptions, maps, and GIS compatible data files for over 400 delineated groundwater basins in California.
Department of Pesticide Regulation
The Department of Pesticide Regulation (DPR) maintains a Ground Water Protection Program. Groundwater regulations related to pesticide use and application can be found here, along with maps and files of sensitive groundwater protection areas.
- AB 2021 Reports – the Pesticide Contamination Prevention Act, State Water Board
Section
- 2009/2010 Annual Report to the Legislature
- 2008/2009 Annual Report to the Legislature
- 2007/2008 Annual Report to the Legislature
- 2006/2007 Annual Report to the Legislature
- 2005/2006 Annual Report to the Legislature
- 2004/2005 Annual Report to the Legislature
- DPR Groundwater Regulations
