Groundwater Information

Groundwater Levels

The California Department of Water Resources (DWR) produces Groundwater Level Change maps which summarize the change in groundwater level measurements over time. Groundwater level data are collected from wells in the northern Sacramento Valley by DWR Northern Region Office Staff and local cooperating entities. Groundwater levels are measured seasonally as part of DWR’s ongoing data collection program.

Visit DWR’s website here: Northern Sacramento Valley Groundwater Elevation Change Maps Website

Presentations

February 12, 2020
Colusa Groundwater Authority Meeting
Groundwater Update, Erin Smith, DWR Northern Region Office
Presentation (PDF)

January 24, 2018
Colusa Groundwater Authority Meeting
Groundwater Conditions, Roy Hull, DWR Northern Region Office
Presentation (PDF)

July 15, 2016
SGMA Governance Workgroup Meeting Number 5
Groundwater Conditions Related to GSP Regulations - Grant Davids, Davids Engineering, Inc.
Presentation (PDF)

June 16, 2016
Groundwater Commission Meeting
Groundwater Conditions, Monitoring Wells - Roy Hull, DWR Northern Region Office
Presentation (PDF)

January 19, 2016
Davids Engineering, Inc., Colusa County Groundwater Assessment
Presentation (PDF)

January 11, 2016
Public Meeting on the Sustainable Groundwater Management Act 
Agenda (PDF) | Presentation (PDF)

May 12, 2015
Groundwater Public Outreach Meeting 

• Agenda-Groundwater Public Outreach Meeting 5.12.2015 (PDF)
• Groundwater Rights, Robert E. Donlan (PDF)
• Spring 2015 Groundwater Conditions, Roy Hull, DWR (PDF)
• SGMA, Kate Williams, CA Water Foundation (PDF)

Presentations from past Groundwater Commission meetings:

• SGMA and Colusa County Implementation, Center for Collaborative Policy (PDF)
• DWR Presentation on Fall, 2015 Groundwater Conditions (PDF)
• DWR Presentation on Summer, 2015 GW Levels and Subsidence Studies (PDF)
• DWR Presentation on GW Legislation 10.2014 (PDF)
• DWR Presentation on 2014 GW Levels (PDF)
• DWR Presentation on 2013 Groundwater Levels (PDF)
• Grant Davids Presentation on Changing Land and Water Use (PDF)
• Downey Brand Presentation on Groundwater Law & Hydrology (PDF)
• Wood Rogers Presentation on Groundwater Monitoring & Resource Management (PDF)

Northern Sacramento Valley Groundwater Newsletter Series

These informative newsletters were developed by the University of California Cooperative Extension in cooperation with the California Department of Water Resources, Northern District. They were published from April, 2003 through July, 2004 and funded by the Renewable Resources Extension Act.

• Seeking an Understanding of the Groundwater Aquifer Systems in the Northern Sacramento Valley (PDF)
• Incentives for Groundwater Management in the Northern Sacramento Valley (PDF)
• Possible Approaches to Groundwater Management in the Northern Sacramento Valley (PDF)
• Groundwater Level Monitoring: What is it? How is it done? Why do it? (PDF)
• Well Design, Construction, and Development: Important Considerations Before Making the Investment (PDF)
• Pumps and Pumping Plant Efficiency: Basics Worth Remembering (PDF)

The following newsletters were published beginning in September, 2005 through 2006, and funded by the Four County Drinking Water Qualtiy Program.

• Seeking an Understanding of the Groundwater Aquifer Systems in the Northern Sacramento Valley: An Update (PDF)
• Conjunctive Water Management: What is it? Why consider it? What are the challenges (PDF)
• Land Subsidence: What is it? Why is it an Important Aspect of Groundwater Management (PDF)
• Monitoring Groundwater Quality: An Important Aspect of Groundwater Management (PDF)