County of Tuolumne GSA

San Joaquin Valley - Modesto

What changed at each monthly refresh. Bold lines are notable changes. Subscribe to the RSS feed to get each update in a feed reader.

Readings through Sep 2026: first edition

• 13 of 62 RMS wells read in the last 12 months are below their MT.
• Plan's undesirable-result rule not met in the latest readings.
• Under the outlook the plan rule is met by Sep 2027 (chance about 60%).

Forecasts use the NOAA outlook (CPC's Oct 2026 issue: water year 2027 at 122% of normal precipitation).