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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

The Colusa Groundwater Authority (CGA) has a new website:

All content related to the CGA, including meeting schedule, agendas, minutes, presentations, SGMA news, etc. can be found on the new site, and will be removed from the County Water Resources site.

Upcoming Meetings:

Colusa Groundwater Authority Special Meeting
March 28, 2018
10:00 a.m. - noon
Colusa Industrial Properties Conference Room
100 sunrise Blvd., Colusa, CA 95932

Visit the new CGA website at  for more information.

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:


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: