Fresno County, CA Water Table Trend
Fresno County, CA: what the water table is actually doing
Fresno County's representative monitoring well shows depth to water declining, slower than most declining counties, a fitted trend of 1 ft per decade over 68 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Fresno County's source well, in detail
Depth to water at the last reading was 130.8 ft below land surface. Readings span 1958-02-26 to 2026-07-22, 1502 measurements from USGS well USGS-365325120391504 (012s012e16h005m), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Fresno County compares nationally
Fresno County sits at rank 1086th of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Fresno County, California is home to about 1,024,125 people. See the fastest-moving counties guide for how Fresno County stacks up against the most extreme cases nationally.
If you own a well in Fresno County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Fresno County, that trend is real, not assumed: 1 ft per decade over 68 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Fresno County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.