California Cooperative Groundwater Monitoring Network
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| California Cooperative Groundwater Monitoring Network | |
|---|---|
| Name | California Cooperative Groundwater Monitoring Network |
| Formation | 1980s |
| Type | Cooperative monitoring network |
| Purpose | Groundwater monitoring and data sharing |
| Headquarters | Sacramento, California |
| Region served | California |
| Parent organization | California Department of Water Resources |
California Cooperative Groundwater Monitoring Network is a statewide cooperative program coordinating groundwater monitoring between state agencies, United States Geological Survey, local water districts, and academic institutions to support water-resources management, policy implementation, and scientific research. The program integrates field sampling, well inventory, quality-assurance protocols, and data-sharing systems to inform decisions under statutes such as the Sustainable Groundwater Management Act and to support drought planning, environmental protection, and agricultural operations in Central Valley, Southern California, and coastal basins. The Network's partners include federal, state, tribal, and municipal entities, and its outputs are used by planners at California Environmental Protection Agency, researchers at University of California, Davis, and consultants working with agencies like Metropolitan Water District of Southern California.
Overview
The Network functions as a partnership among agencies including United States Geological Survey, California Department of Water Resources, State Water Resources Control Board, and regional entities such as Santa Clara Valley Water District, Fresno Irrigation District, and Kern County Water Agency. It links monitoring wells, municipal supply wells, agricultural producers, and research observatories across hydrologic regions like the Sacramento Valley, San Joaquin Valley, Los Angeles Basin, Salton Sea Basin, and the Mojave Desert. Objectives include tracking groundwater levels, chemistry, and trends to support decision-makers at California Natural Resources Agency and to inform litigation, permitting, and environmental reviews under statutes such as the Clean Water Act when groundwater-surface water interactions are at issue. The Network interfaces with academic programs at Stanford University, University of California, Berkeley, California State University, Fresno, and federal programs run by Bureau of Reclamation.
History and Development
Origins trace to cooperative mapping and monitoring efforts in the late 20th century involving agencies like USGS and state entities responding to groundwater depletion and contamination episodes in regions such as the Central Valley Project service area and the Los Angeles Basin subsidence concerns. Key milestones include integration with statewide initiatives led by California Department of Water Resources in the 1980s and 1990s, responses to contamination events that engaged Environmental Protection Agency programs, and formal alignment with the Sustainable Groundwater Management Act in the 2010s. Influential events that shaped methods included studies by California State Water Resources Control Board into nitrate contamination near Salinas Valley and investigations by USGS into aquifer storage and recovery in collaboration with Metropolitan Water District of Southern California and tribal partners such as the Yurok Tribe for basin-scale assessments.
Organization and Governance
Governance is shared among state and federal agencies, local water agencies, and academic partners; principal administrative oversight rests with California Department of Water Resources and programmatic coordination involves USGS personnel and regional water boards such as California Regional Water Quality Control Board, Central Valley Region. Participating entities include municipal utilities like San Francisco Public Utilities Commission, irrigation districts such as Westlands Water District, and research centers including Scripps Institution of Oceanography and the California Water Institute. The Network operates through memoranda of understanding and data-sharing agreements with partners including National Oceanic and Atmospheric Administration for coastal groundwater-surface interaction studies and United States Army Corps of Engineers when projects intersect with flood control infrastructure.
Monitoring Network and Methodology
The Network employs standardized protocols developed with USGS for water-level measurement, water-quality sampling, and well construction documentation, using instrumentation from manufacturers used by Lawrence Livermore National Laboratory and data loggers consistent with practices at Sandia National Laboratories for environmental monitoring. Monitoring extends across aquifer systems such as the Coastal Plain aquifer of Los Angeles, the Santa Ana River basin, and fractured-rock basins in the Sierra Nevada foothills. Techniques include manual and automated water-level monitoring, geochemical analysis for constituents identified by Office of Environmental Health Hazard Assessment and isotopic tracing used in studies affiliated with California Institute of Technology and University of California, Santa Barbara. Coordination with regional groundwater sustainability agencies such as those established under Sustainable Groundwater Management Act ensures temporal frequency and spatial coverage suited to basin management needs.
Data Management and Accessibility
Data stewardship leverages statewide databases maintained by California Department of Water Resources and interoperable standards promoted by USGS and academic partners including UC Berkeley Water Center. Data variables include static well logs, time-series water levels, major ion chemistry, and constituents of emerging concern tracked by State Water Resources Control Board. The Network adopts metadata standards aligned with federal practices used by National Water Information System and integrates with mapping platforms familiar to users of ESRI products and scientific analysis tools used at Lawrence Berkeley National Laboratory. Accessibility supports stakeholders ranging from tribal governments like the Yurok Tribe to utilities such as East Bay Municipal Utility District and researchers at California State University, Long Beach through public portals and exchange protocols.
Key Findings and Impact
Network analyses have documented regional declines in groundwater levels across Central Valley subbasins, spatial distribution of nitrate contamination near Salinas Valley and San Joaquin Valley agricultural areas, and seawater intrusion along coastal basins such as Orange County and Santa Cruz. Findings informed groundwater sustainability plans produced by local entities like Santa Clara Valley Water District and regulatory oversight by State Water Resources Control Board. The Network’s data supported infrastructure investments by Bureau of Reclamation and recharge projects coordinated with Metropolitan Water District of Southern California, and underpinned peer-reviewed studies published by researchers at UC Davis, Stanford University, and USGS that influenced policy debates in the California State Legislature.
Challenges and Future Directions
Challenges include sustaining long-term funding through state appropriations and federal grants administered by agencies including USGS and EPA, improving spatial coverage in small or under-monitored basins such as portions of the Mojave Desert and tribal lands, and integrating novel sensors and remote-sensing products from programs like NASA for improved aquifer characterization. Future directions emphasize enhanced interoperability with groundwater sustainability agencies formed under Sustainable Groundwater Management Act, expanded partnerships with tribal nations including Yurok Tribe and Maidu communities, adoption of advanced analytics used at Lawrence Livermore National Laboratory and Stanford Doerr School of Sustainability, and increased coordination with coastal resilience efforts led by California Coastal Commission.