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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)
530.383.4625 (mobile)

Latest News

Recent Presentations:

January 24, 2018 CGA Board Meeting
Groundwater Conditions - Roy Hull, DWR Northern Region Office

October 26, 2017 CGA Board Meeting:

SGMA 101 - Dave Ceppos, Center for Collaborative Policy

DWR Groundwater Conditions and Available Data - Roy Hull, DWR Northern Region Office


Upcoming Meetings:

The Colusa Groundwater Authority has set their 2018 meeting schedule. They will meet quarterly, on the fourth Wednesday of the month beginning in January, 2018.

All meetings are held at 1:00 p.m. at the Colusa Industrial Park Conference Room, 100 sunrise Blvd., Colusa, CA 95932

January 24, 2018 - Start time changed to 1:30 p.m.
April 25, 2018
July 25, 2018
October 24, 2018

See the SGMA Page for Agendas, Presentations and Meeting Summaries from past GSA Workgroup meetings, Public Outreach meetings and PPAC meetings.

(6/27/17) The Colusa County Board of Supervisors has approved a recommendation by the Colusa County Groundwater Commission to approve the appointment of Commissioners Darrin Williams and Jeff Moresco to serve as the Private Pumper representatives on the Colusa Groundwater Authority Board.

The Colusa County GSA Workgroup has finalized the Joint Exercise of Powers Agreement Establishing the Colusa Groundwater Authority (5/11/2017)

A fact sheet on the SGMA Draft Emergency Regulation for State Intervention Fees is now available:

: This new tool allows local agencies, groundwater sustainability agencies (GSAs), and watermasters to submit, modify, and view the information required by the Sustainable Groundwater Management Act (SGMA), and enables the public and interested stakeholders to view submitted information and provide comments, where applicable.

Download the latest GSA Workgroup Documents:

FINAL Colusa Joint Exercise of Powers Agreement Establishing the Colusa Groundwater Authority (5/11/2017)


Results of June, 2016 Subsidence resurvey in the Arbuckle Area
Presentation (DWR) | Letter from DWR


Click here to view a presentation on GSP Regulations, Groundwater Sustainability Plan Contents. Presented by Bill Ehorn, DWR Northern Region Office a the Northern Sacramento Valley IRWMP TAC meeting on August 17, 2016

The latest Water Resources Update Newsletter is now available:
July, 2017 Special SGMA Edition


Recent informational articles on SGMA in the local newspapers:

September 14, 2016 Colusa County SGMA Update
August 1, 2016 SGMA Implementation in Colusa County
July 25, 2016 GSAs, GSPs and PPAC
July 11, 2016 What is SGMA


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:


On May 26, 2016, the Colusa County Private Pumper Advisory Committee (PPAC) sent a letter to all private pumpers in the County to provide them with information regarding SGMA implementation efforts in Colusa County, and to let them know how they can stay informed and engaged as critical groundwater management decisions are being made. Click here to read the letter.

The California Water Commission, at their May 18, 2016 meeting, approved the Groundwater Sustainability Plan Emergency Regulations. These regulations will guide GSAs as they implement SGMA locally. The regulations went into effect June 1, 2016.
Final GSP Regulations
Press Release


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.


Sustainable Groundwater Planning Grant Program
Colusa County has received grant funding from the 2015 Counties with Stressed Basins, Proposition 1 Sustainable Groundwater Planning Grant Program. This funding will be applied to development of a countywide groundwater monitoring and data management program. Information on funding recommendations, proposal evaluations and more can be viewed and downloaded at:


SGMA Public Meeting
A public meeting to provide information on local implementation of the Sustainable Groundwater Management act (SGMA) was held:
January 11, 2016
6:00-8:00 p.m.
Colusa County Fairgrounds
Atwood Hall
Meeting Notes


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: