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
Email: mfahey@countyofcolusa.com
530.458.0719 (office) | 530.383.4625 (cell)

Latest News

At the February Groundwater Commission meeting, the Commission adopted Annual Goals and Objectives for 2020

2020 Groundwater Commission Meeting Schedule:  
All meetings are held from 10:00 a.m. to noon
at Colusa Industrial Properties, 100 Sunrise Boulevard, Colusa, CA 95932

February 12, 2020 
June 3, 2020 at 1:00 p.m., Meeting and Public Hearing
August 5, 2020
November 4, 2020

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 CGA website.

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 was completed in 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

Read a good overview of California Groundwater, including information on SGMA

Domestic Well Users and SGMA (PDF)- View 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.