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Water Resources

Welcome to the Colusa County Water Resources Division. We are involved in the following activities:

  • Planning and implementation of the Sustainable Groundwater Management Act (SGMA)
  • Northern Sacramento Valley Integrated Regional Water Management Planning (NSV IRWMP)
  • California Statewide Groundwater Elevation Monitoring (CASGEM)
  • Irrigated Lands Regulatory Program
  • Sites Reservoir Outreach
  • Other water-related activities

100 Sunrise Boulevard, Suite A
Colusa, CA 95932

Staff contact: 
Mary Fahey, Water Resources Manager
530.458.7709 (office)

Latest News

The next meeting of the Colusa County Groundwater Commission is
February 13, 2019 at 10:00 a.m.
Colusa Industrial Properties
100 Sunrise Blvd., Colusa, CA 95932
Click HERE to download the Agenda

This meeting will feature a Public Forum with presentations on:
- Bay Delta Water Quality Control Plan Updates
- 2017 Sacramento Valley Land Subsidence Survey
- Sustainable Groundwater Management Act implementation and Funding


For information related to local implementation of the Sustainable Groundwater Management Act (SGMA), visit the Colusa Groundwater Authority (CGA) website:

All content related to the CGA, including meeting schedule, agendas, minutes, presentations, SGMA news, etc. can be found on the new site.

Upcoming Meetings:

Colusa Groundwater Authority Board Meeting
January 15, 2019
1:00-3:00 p.m.
Westside Water District
5005 Hwy 20, Williams, CA

Visit the new CGA website at  for more information.

Colusa County Groundwater Commission
February 13, 2019
10 a.m. - noon

Colusa Industrial Properties Conference Room
100 sunrise Blvd., Colusa, CA 95932

See the Meetings Page for more information


Proposition 1 Sustainable Groundwater Planning grant for Counties with Stressed Basins (2016-2018)

A Program to Advance Groundwater Sustainability for Colusa County through Policy, Institutional and Technical Refinement

Financed Under: The Water Quality, Supply, and Infrastructure Improvement Act of 2014, Sustainable Groundwater Planning Grant Program (Proposition 1)
Administered by: The State of California Department of Water Resources
Contractor: Davids Egineering, Inc.


The County of Colusa received $250,000 in grant funding in 2016 from the Sustainable Groundwater Planning Grant Program for Counties with Stressed Basins. The Work Plan includes a groundwater monitoring network update and development of a data management system. This project will be completed by the end of May, 2018, and much of the work will be integrated into the Colusa Subbasin Groundwater Sustainability Plan.


Please visit and "like" the Colusa County Groundwater Facebook Page


Click this link to read a good overview on California Groundwater, including information on SGMA:


Domestic Well Users and SGMA - Click on this link for a brochure with information for domestic well owners and how they may be affected by SGMA.

For information on groundwater meetings in Colusa County, including Agendas, Minutes and Presentations, please see the Meetings page.


Progress Report: Subsidence in the Central Valley, California
Click on the link below to download a recent NASA report on subsidence in the Central Valley. On pages 10 and 11 you will find information for the Sacramento Valley: