Sacramento Valley – Colusa

Source: CA DWR

Sacramento Valley – Colusa


  • Basin Name
  • Sacramento Valley – Colusa
  • Basin Number
  • 5-021.52
  • SGMA Basin Priority
  • Medium
  • Critically Overdrafted
  • No
  • Status
  • Subject to SGMA
  • DWR Region & POC
  • Northern Region Office
    Erin Smith
    (530) 529-7314

  • Number of Wells
  • 5972
  • Hydrologic Region Name
  • Sacramento River Hydrologic Region
  • Counties
  • Colusa, Glenn, Plumas, Tehama, Yolo


Located in California’s Sacramento River hydrologic region, the Sacramento Valley – Colusa is 705,170 acres in size. This Medium priority basin is home to an estimated 43,827 people (2010 value), which have been at a rate of 23.68. Sacramento Valley – Colusa is a(n) basin with approximately 5972 wells, of which approximately 86 are water supply wells. Groundwater accounts for approximately 32.1 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2014: Basin prioritization – medium. Comments: Severely declining GW levels along the west-side of Glenn Co. Moderately declining GW levels in the Capay area. High TDS shallow aquifer in Maxwell- Williams area.
Increase in housing development along I5. GW-SW interaction is important to maintaining waterfowl refuges. Area is being highlighted as solution area for Delta outflow issues…proposed increase in CU and GW pumping.

2016: Basin boundary modification

Revised basin boundary description

2018: Priority – high

Per 2018 draft basin prioritization: Groundwater-related transfer  “Type A” in which local groundwater is pumped to compensate for exported supply

Butte County basin boundary/consolidation request for Colusa and the Wyandotte Creek 5-021.69, Corning 5-021.51,  Vina 5-021.57, West Butte 5-021.58, East Butte 5-021.59, Sutter 5-021.62 subbasins pending

GSA Information

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