Tulare County, CA Water Table Trend
Tulare County's groundwater trend, from USGS's own readings
Tulare County's long-term well puts the trend at 30.6 ft per decade, declining faster than most declining counties, based on 15 measurements since 1987.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Tulare County's source well, in detail
Depth to water at the last reading was 142.1 ft below land surface. Readings span 1987-04-21 to 2025-08-19, 15 measurements from USGS well USGS-361003119212501 (020s024e22c001m), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Tulare County compares nationally
Tulare County sits at rank 1443rd 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. Tulare County, California is home to about 483,546 people. See the fastest-moving counties guide for how Tulare County stacks up against the most extreme cases nationally.
If you own a well in Tulare County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Tulare County, that trend is real, not assumed: 30.6 ft per decade over 38 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Tulare 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.