This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Sacramento Valley aquifer system | |
|---|---|
| Name | Sacramento Valley aquifer system |
| Location | Sacramento Valley |
| Country | United States |
| State | California |
| Type | Aquifer system |
Sacramento Valley aquifer system The Sacramento Valley aquifer system underlies the Sacramento Valley in Northern California and supports urban, agricultural, and ecological water demands across Sacramento County, Yolo County, and Butte County. It interacts with surface systems such as the Sacramento River and wetlands associated with the Sutter Bypass and Yolo Bypass, supplying water to municipalities like Sacramento, California and agricultural centers such as Davis, California and Chico, California. Management involves federal and state agencies including the United States Geological Survey, the California Department of Water Resources, and local districts such as the South Sacramento County Agricultural Improvement District.
The aquifer system consists of interconnected alluvial deposits beneath the floor of the Sacramento Valley and forms part of the larger Central Valley groundwater basin recognized by the California Department of Water Resources. Key populated places overlying the system include Sacramento, California, Redding, California, Marysville, California, and Gridley, California. Major infrastructure and projects influencing the system include the Central Valley Project, the State Water Project, and regional agencies such as the Sacramento Area Flood Control Agency and the Metropolitan Water District of Southern California. Historic events shaping use include policy responses after the California droughts and litigation such as proceedings connected to the Sierra Club and water rights adjudications involving the Sacramento River Watershed Program.
Geologic formations include Quaternary alluvium, Holocene floodplain deposits, and Pleistocene terrace gravels sourced from the Sierra Nevada and the Coast Ranges, with confining units influenced by the Great Valley Sequence. The hydrostratigraphy features unconfined and semi-confined aquifers, with transmissivity and storativity varying across subbasins such as the Sacramento Valley Subbasin recognized by the California State Water Resources Control Board. Tectonic setting and paleoclimate shifts tied to the Cenozoic history influence subsurface layering, while sediment provenance links to drainage systems including the Feather River and the American River.
Recharge sources include infiltration from the Sacramento River, floodplain percolation in the Sutter Basin and Yolo Bypass, irrigation return flow from agricultural areas around Butte County and Colusa County, and managed aquifer recharge projects coordinated by entities such as the California Department of Water Resources and local groundwater sustainability agencies established under the Sustainable Groundwater Management Act. Groundwater flow is generally from recharge areas near the Sierra Nevada foothills toward the valley center and drainage to the Sacramento-San Joaquin Delta, with hydrodynamics affected by pumping for utilities serving Sacramento Municipal Utility District service areas and irrigation districts like the Tehama-Colusa Canal Authority.
Primary uses are agricultural irrigation in regions including Yolo County and Colusa County, municipal supply for Sacramento, California and suburban communities, and industrial uses tied to food processing in Butte County and Yuba County. Management institutions include the Central Valley Regional Water Quality Control Board, local water districts, and groundwater sustainability agencies formed pursuant to the Sustainable Groundwater Management Act. Infrastructure such as groundwater wells, pumping plants operated by the United States Bureau of Reclamation, and conveyance facilities associated with the State Water Project and the Central Valley Project shape allocations and seasonal operations, often coordinated during California droughts and flood events.
Contaminants documented in the aquifer system include nitrate from fertilizer and septic systems affecting areas near Davis, California and Yuba City, California, volatile organic compounds historically linked to industrial sites and regulated under programs of the Environmental Protection Agency and the State Water Resources Control Board, and naturally occurring arsenic influenced by geochemistry in parts of Colusa County and Glenn County. Salinity increases have been monitored where excess irrigation return flows and reduced recharge alter groundwater chloride and total dissolved solids, prompting involvement by the Central Valley Regional Water Quality Control Board, the United States Geological Survey, and advocacy groups like the Natural Resources Defense Council in policy discussions.
Long-term monitoring networks are maintained by the United States Geological Survey, the California Department of Water Resources, and local water agencies with observation wells, borehole logs, and geophysical surveys. Research partnerships with academic institutions such as the University of California, Davis, the University of California, Berkeley, and Stanford University investigate aquifer storage and recovery, isotopic fingerprinting, and groundwater–surface water interactions using tools developed in research funded by programs linked to the National Science Foundation. Projects include managed aquifer recharge pilots, groundwater modeling using hydrogeologic frameworks adopted by the California Water Foundation, and tracer experiments in collaboration with the California Office of Emergency Services for resilience planning.
Legal governance integrates water rights doctrines litigated in state courts, regulatory frameworks from the California State Water Resources Control Board and the Central Valley Regional Water Quality Control Board, and the statutory regime of the Sustainable Groundwater Management Act which has led to formation of groundwater sustainability agencies across the valley. Federal statutes and programs, including actions by the United States Bureau of Reclamation and compliance with the Clean Water Act, intersect with local ordinances and multi-agency compacts involving entities such as the Ten West Initiative and regional planning bodies like the Sacramento Area Council of Governments.
Groundwater levels and quality influence riparian habitats along the Sacramento River and wetland complexes in the Sutter Basin and Yolo Bypass, affecting species of concern managed under plans by the California Department of Fish and Wildlife and federal agencies such as the United States Fish and Wildlife Service. Changes in groundwater-surface water exchange impact spawning grounds for anadromous fishes associated with the Central Valley Steelhead and Chinook salmon (Oncorhynchus tshawytscha), as well as wetland-dependent birds protected under agreements involving the National Audubon Society and regional habitat conservancies like the Butte County Association of Governments.
Category:Aquifers of California