Johnston County, OK Water Table Trend
Is the water table dropping in Johnston County, OK?
Johnston County's representative monitoring well shows depth to water declining at a typical pace for a declining county, a fitted trend of 3.8 ft per decade over 50 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Johnston County's source well, in detail
Depth to water at the last reading was 66.8 ft below land surface. Readings span 1977-01-27 to 2026-10-05, 134 measurements from USGS well USGS-342633096494401 (01s-04e-25 Add Johnston 25), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Johnston County compares nationally
Johnston County sits at rank 1272nd 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. Johnston County, Oklahoma is home to about 10,293 people. See the fastest-moving counties guide for how Johnston County stacks up against the most extreme cases nationally.
If you own a well in Johnston County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Johnston County, that trend is real, not assumed: 3.8 ft per decade over 50 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Johnston 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.