Ukiah Valley

Source: CA DWR

Ukiah Valley


  • Basin Name
  • Ukiah Valley
  • Basin Number
  • 1-052
  • SGMA Basin Priority
  • Medium
  • Critically Overdrafted
  • No
  • Hydrologic Region Name
  • North Coast
  • Counties
  • Mendocino
  • Adjacent Basins


Located in California’s hydrologic region, the Ukiah Valley is 37,537 acres in size. This Medium priority basin is home to an estimated 32,713 people (2010 value), which have been at a rate of .

Ukiah Valley is a(n) basin with approximately 936 wells, of which approximately 49 are water supply wells. Groundwater accounts for approximately 62.64 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2010: Ukiah Valley Water Supply Assessment expresses concerns regarding SWRCB assertion that all or most of the “groundwater” in the basin is, for legal purposes, underflow from the Russian River and associated tributaries…which support endangered fishery. (Per 2014 Basin prioritization)

2014: CASGEM groundwater basin prioritization process ranked the Ukiah Valley Groundwater Basin medium priority.

2018 Basin Prioritization: Status remains unchanged.  Basin is Medium Priority.

GSA Information