San Joaquin Valley – Modesto
Statistics
- Basin Name
- San Joaquin Valley – Modesto
- Basin Number
- 5-022.02
- SGMA Basin Priority
- High
- Critically Overdrafted
- No
- Hydrologic Region Name
- San Joaquin River
- Counties
- Stanislaus
Basin Notes
2003: Bulletin 118 basin description
2014: CASGEM basin prioritization – High. Comment: Water quality degradation due to industrial and agricultural practices.
2018: Draft basin prioritization – High. Comments: 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) In Appendix A – Selected General Plans for the San Joaquin River Watershed, Modesto depends heavily on groundwater, but is cooperating with the Modesto Irrigation District to develop a new surface water supply that will be used to stabilize groundwater overdraft problems.
Final Basin Prioritization: High.
2022: January 22 – GSP submitted to DWR
2024: January 18 — DWR deemed GSP incomplete
July 12 – revised GSP submitted to DWR
July 18 – DWR opens comment period until 9/16
At-A-Glance
California Water Library Documents About This Basin
CV-SALTS Preliminary Management Zone Proposal for Priority 2 Management Zones
Valley Water Collaborative | December 30th, 2024
The Nitrate Control Program is designed to achieve the following three management goals in the Central Valley Region: Goal 1 – Ensure a safe drinking water
Modesto Subbasin Groundwater Sustainability Plan (Revised)
Publisher not available | July 12th, 2024
Submitted to the Department of Water Resources (DWR) in January 2022, the first version of this GSP was reviewed by DWR in January 2024 and determined to be incomplete (D
Replenishing Groundwater in the San Joaquin Valley: 2024 Update
Public Policy Institute of California (PPIC) | June 6th, 2024
Strategies to replenish groundwater basins—long used in some areas of the San Joaquin Valley—have increasingly come into focus as the region seeks to bring its overd
Statement of Findings regarding the Determination of Incomplete Status of the San Joaquin Valley -- Modesto Subbasin Groundwater Sustainability Plan
California Department of Water Resources (DWR) | January 18th, 2024
The Department of Water Resources (Department) is required to evaluate whether a submitted groundwater sustainability plan (GSP or Plan) conforms to specific requirements
CV-SALTS Modesto Management Zone Implementation Plan
Valley Water Collaborative | September 5th, 2023
The Central Valley Regional Water Quality Control Board (Central Valley Water Board) adopted amendments to the Water Quality Control Plan for the Sacramento River and San
Quality of Groundwater Used for Domestic Supply in the Modesto, Turlock, and Merced Subbasins of the San Joaquin Valley, California
U.S. Geological Survey (USGS) | January 6th, 2023
More than 2 million Californians rely on groundwater from privately owned domestic wells for drinking-water supply. This report summarizes a water-quality survey of domes
Modeling the dynamic penetration depth of post-1950s water in unconfined aquifers using environmental tracers: Central Valley, California
Journal of Hydrology (Elsevier) | December 5th, 2022
The penetration depth of post-1950s recharge (D-1950) in aquifers is a marker that is frequently used to identify groundwater that is susceptible to anthropogenic contami
Post-Drought Groundwater Storage Recovery in California's Central Valley
American Geophysical Union (AGU) | October 5th, 2021
California's Central Valley has experienced chronic groundwater depletion over the past few decades, the rate of which was amplified by droughts in 2007–2009 and 2012?
Groundwater and Urban Growth in the San Joaquin Valley
Public Policy Institute of California (PPIC) | September 20th, 2021
The San Joaquin Valley is ground zero for the Sustainable Groundwater Management Act (SGMA). It has the largest groundwater deficit in California and faces some of the
Critical Aquifer Overdraft Accelerates Degradation of Groundwater Quality in California's Central Valley During Drought
American Geophysical Union (AGU) | September 1st, 2021
It has been established that wells are at risk to run dry when groundwater levels decline during drought, but associated impacts to water quality are poorly understood.
Groundwater development leads to decreasing arsenic concentrations in the San Joaquin Valley, California
Science of the Total Environment (Elsevier) | January 18th, 2021
In the San Joaquin Valley (SJV), California, about 10% of drinking water wells since 2010 had arsenic concentrations above the U.S. maximum contaminant level of 10μg/L.
Base of fresh water, groundwater salinity, and well distribution across California
National Academy of Sciences (NAS) | December 9th, 2020
The depth at which groundwaters transition from fresh to more saline—the “base of fresh water”—is frequently used to determine the stringency and types of measure
Divergent effects of climate change on future groundwater availability in key mid-latitude aquifers
Nature Portfolio (Springer Nature) | July 24th, 2020
Groundwater provides critical freshwater supply, particularly in dry regions where surface water availability is limited. Climate change impacts on GWS (groundwater stora
Domestic well vulnerability to drought duration and unsustainable groundwater management in California's Central Valley
Environmental Research Letters (IOP) | March 18th, 2020
Millions of Californians access drinking water via domestic wells, which are vulnerable to drought and unsustainable groundwater management. Groundwater overdraft and th
Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells
Journal of Contaminant Hydrology (Elsevier) | July 19th, 2019
Nitrate in drinking water may cause serious health problems for consumers. Agricultural activities are known to be the main source of groundwater nitrate contaminating ru
A hybrid machine learning model to predict and visualize nitrate concentration throughout the Central Valley aquifer, California, USA
Science of the Total Environment (Elsevier) | June 9th, 2017
Intense demand for water in the Central Valley of California and related increases in groundwater nitrate concentration threaten the sustainability of the groundwater res
Simulations of Ground-Water Flow and Particle Pathline Analysis in the Zone of Contribution of a Public-Supply Well in Modesto, Eastern San Joaquin Valley, California
U.S. Geological Survey (USGS) | July 1st, 2008
Land subsidence in the San Joaquin Valley, California, as of 1980
U.S. Geological Survey (USGS) | July 1st, 1984