A variety of resources and articles related to SGMA, Groundwater Sustainability Plans, Groundwater Sustainability Agencies and other groundwater-related data and information, organized by topic.
Explore groundwater levels at monitoring wells throughout the Subbasin.
For engineering or scientific access to our groundwater database.
This site offers the most current local and statewide water conditions down to your region and even your neighborhood.
California's Groundwater Live provides a statewide analysis of up-to-date groundwater conditions.
Hosts real-time hydrologic and climate data.
A DWR map application for viewing a variety of data, including groundwater levels, land subsidence, and water quality information.
Provides a real-time glance at weather and hydrologic conditions nationwide.
This tool from The Nature Conservancy shows potential trends in plant health among groundwater dependent ecosystems (GDE's).
OpenET uses best available science to provide easily accessible satellite-based estimates of evapotranspiration (ET) for improved water management across the western United States. Using the Data Explorer, users can explore ET data at the field scale for millions of individual fields or at the original quarter-acre resolution of the satellite data.
Learn about the basics of SGMA and subscribe to DWR updates.
The irrigation district providing surface water and groundwater recharge for much of Yolo County. Also maintains a library of historical reports relating to water in Yolo County.
The Water Resources Association of Yolo County (WRA) is a consortium of entities authorized to provide a regional forum to coordinate and facilitate solutions to water issues in Yolo County.. Also reprsents Yolo County in the Westside Integrated Regional Water Management (IRWM) group.
An independent news blog providing daily updates in California water news.
A catalog of various water reports organized by topic and hydrologic region.
An online video library of groundwater information.
A variety of resources and reports organized by sustainability indicator.
Stanford Water in the West: Fair Water - The study, published in Society and Natural Resources, evaluated 137 surveys of Yolo County farmers to gauge their perceptions of fairness for groundwater allocation strategies and dispute resolution options. (April 2020)
Groundwater management in Yolo County is discussed in many of the publications in this Special Issue of California Agriculture.
This guide is designed to help you get involved in developing a local groundwater sustainability plan, a requirement of California’s Sustainable Groundwater Management Act.
Using this guide and online toolkit, a diverse range of people can equip themselves to effectively participate in shaping the vision and plan for their community around maintaining groundwater supplies.(September 2017)
The Sustainable Groundwater Management Act (SGMA) requires the State Water Resources Control Board to adopt, by emergency regulation, a schedule of fees to cover the costs associated with state intervention.
On May 16, 2016, the State Water Board adopted resolution 2017-33 to adopt an Emergency Regulation for Implementation of the Sustainable Groundwater Management Act of 2014 (SGMA). On June 19, 2017, the regulation was submitted to the Office of Administrative Law (OAL) for review. OAL approved the regulation on June 29, 2017.
For State Water Resources Control Board Intervention Fees for Unmanaged Portions of Groundwater Basins, please see the Draft Emergency Regulation for State Intervention Fact Sheet. (5/16/2017)
To Consolidate or Coordinate: Status of the Formation of Groundwater Sustainability Agenies in California
This report provides a preliminary look at whether local agencies are pursuing consolidate (single GSA) or coordinated (multiple GSA) approaches to managing groundwater basins, and why. Yolo County is a highlighted case study! (December 2016)
Designing Effective Groundwater Sustainability Agencies: Criteria for Evaluation of Local Governance Options
The primary purpose of this document is to assist stakeholders and decision makers in evaluating the design of GSAs. It aims to empower them to think critically about whether proposed GSAs will meet their needs now and in the future, and—if not—which tools may help to achieve these goals. The framework presented here draws on experience in other natural resource management contexts and on research on governance and institutional design to provide lessons learned and illustrative examples. (March 2016)
Measuring What Matters: Setting Measurable Objectives to Achieve Sustainable Groundwater Management in California
To understand how GSAs might develop effective measurable objectives and to inform the GSP regulations currently under development by the Department of Water Resources (DWR), this report provides a review of the state of knowledge and practice related to setting measurable objectives for groundwater management.
The Sustainable Groundwater Management Act (SGMA) gives local agencies the authorities to manage groundwater in a sustainable manner and allows for limited state intervention when necessary to protect groundwater resources. The SGMA requires the creation of groundwater sustainability agencies to develop and implement local plans allowing 20 years to achieve sustainability. The SGMA provides a state framework to regulate groundwater for the first time in California history. (October 2015)
This Groundwater Sustainability Agency Formation Guide is meant to provide local agencies with a resource for GSA formation and GSP coordination. (September 2015)
California’s Groundwater features current knowledge of groundwater resources including information on the location, characteristics, use, management status, and conditions of the State’s groundwater. The publication also presents findings and recommendations that support the future management and protection of groundwater.
This analysis by NCWA presents the current conditions of the groundwater resource in the Sacramento Valley and outlines the management challenges ahead.
This Groundwater Management Plan (GWMP) is intended to comply with Assembly Bill 3030 and Senate Bill 1938 (Water Code sections 10750 through 10756). The Plan covers the service area of the District.
County-wide modeling of the groundwater aquifer and surface water system.
July 2004 - Groundwater Monitoring Program, Data Management System, and Update of Groundwater Conditions in the Yolo County Area
Provides a County-wide assessment of groundwater levels and quality and establishes a comprehensive groundwater monitoring program under the AB 303 program.
Explores groundwater conditions and water demand in the northern part of Yolo County.
This report was compiled by West Yost Associates to assess the impact of groundwater pumping in Eastern Yolo County during the 1991 drought.
1989 - Texture distribution of the younger alluvial sediments and parts of the Tehama Formation in portions of Yolo, Solano, Colusa, and Sacramento Counties, California
A thesis report that used well logs to determine the depth of alluvial deposits and the top of the underlying Tehama Formation.
Investigates groundwater supply, extraction, and potential for groundwater overdraft in Yolo County, providing an early approximation of the Subbasin's water balance.
InSAR, or Interferometric Synthetic Aperture Radar, uses radar measurements from satellites to estimate the displacement in the ground surface. The data from DWR is updated quarterly and accessible on SGMA Data Viewer.
The California Department of Water Resources conducted a re-observation of subsidence in the Sacramento Valley Network in summer 2017. The Final Report was released in December 2018. For more information please contact Project Manager Seth Lawrence and Surveyor James West in DWR's Red Bluff regional office.
This project assessed the viability of the InSAR technology for evaluating subsidence within Yolo County.
This report confirms that land subsidence in California is not just a historical occurrence, but is an ongoing problem in many regions. The report presents key examples of significant historical subsidence and current active occurrences of subsidence, including the impacts and costs. The Yolo County GPS and Extensometer Subsidence Network efforts are briefly discussed in the report.
The observation data was collected in June 2016 with the leadership of Jim Frame, Frame Surveying & Mapping, from Davis. The WRA, Yolo County, Conaway Ranch and the Yolo County Flood Control & Water Conseration District provided the funding for this project.
The Yolo County Subsidence Network monitoring project was the template and inspiration for DWR to expand a monitoring project throughout the Sacramento Valley. Jim Frame, Frame Surveying and DWR staff coordinated the surveying activities. In Yolo County, the cities of Davis and Woodland, Observations in Yolo County took place between May 2 to May 22, 2008.
This report by Don D'Onofrio and Jim Frame provides updated data to their 1999 and 2003 reports.
This report presents the results of the 2002 GPS survey event in comparison to 1999.
A brief description of GPS surveying is followed by a summary of each of four surveys between 1985 and 1989. In addition to periodic conventional spirit levelling, an examination was made of the changes in GPS-derived ellipsoidal height differences (summary differences) between pairs of adjacent bench marks in central Sacramento Valley from 1986 to 1989.
Examines the extent and impacts of land subsidence in the Sacramento Valley between 1949 and 1990.
This USGS report identifies apparent land subsidence between two surveys in 1949 and 1967.
The Irrigated Lands Regulatory Program (ILRP) is a statewide program initiated in 2003 with focus on protecting surface waters; groundwater regulations were added in 2012. The Yolo County Farm Bureau administers the program within Yolo County.
Provides annual reports on the status of water quality monitoring in the Sacramento Valley.
The study examines the sources of nitrate contamination in wells and age of groundwater within Yolo County.
Ground-water-quality conditions were investigated in Yolo and Solano Counties during the summers of 1980 and 1981 by sampling 188 representative wells. Chemical analyses of the water samples show that the ground water is suitable for domestic and most agricultural purposes. Water samples from wells near the Sacramento River generally contained lower concentrations of dissolved solids and higher concentrations of trace elements than the rest of the study area.
Water Quality Databases
Data from Irrigated Lands Regulatory Program, cleanup sites, oil & gas production, underground storage tanks, and land disposal sites. Includes programs run by State Water Board and other agencies.
Accumulation of groundwater quality data from state & regional boards, DWR, Department of Pesticide Regulations, USGS, Lawrence Livermore National Laboratory, and local entities.
Data from hazardous waste facilities and contaminated sites.
Compliance monitoring and results for all public water systems.
Tracks places of interest; manages permits and inspections. Includes Waste Discharge Requirements (WDRs) and WDRs waiver records.
An online catalogue of documents pertaining to Cache Creek and adjacent areas in Yolo and Lake counties has been made available through the Water Resources Center Archives. Users of the catalogue can locate technical reports, newsletters, maps, photographs and videos regarding Cache Creek.
The Cache Creek Area Plan (CCAP) is a rivershed management plan adopted by Yolo County in 1996 for 14.5 miles of lower Cache Creek, between the Capay Dam and the town of Yolo. The Technical Advisory Committee monitors the status of the creek and publishes annual status reports.
Provides links and descriptions of historical reports about Putah Creek and the surrounding area.
A collection hosted by the Sacramento River Forum. Here you can find a large amount of information, maps, books, documents, and personal knowledge on the Sacramento River.
Provides continuous monitoring of flows along Putah Creek, a riparian flow forecast, and hydrogeological modeling of the creek.
Streamflow Depletion by Wells - Understanding and Managing the Effects of Groundwater Pumping on Streamflow
A USGS publication explaining how groundwater pumping reduces the amount of groundwater that flows to streams and, in some cases, can draw streamflow into the underlying groundwater system. Streamflow reductions (or depletions) caused by pumping have become an important water-resource management issue because of the negative impacts that reduced flows can have on aquatic ecosystems, the availability of surface water, and the quality and aesthetic value of streams and rivers.
A 16,600 acre wetland area managed by the California Department of Fish and Wildlife according to the Land Management Plan.
The plan identifies and prioritized water resource issues and projects in five categories:
- Water supply and drought preparedness
- Water quality
- Flood control and storm drainage
- Riparian and aquatic ecosystem enhancement
A variety of technical reports on irrigation operations and conjuctive use projects for the Cache Creek watershed.