Ellis County, OK Water Table Trend
Ellis County's groundwater trend, from USGS's own readings
Ellis County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.1 ft per decade over 38 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Ellis County's source well, in detail
Depth to water at the last reading was 13.8 ft below land surface. Readings span 1979-04-14 to 2017-09-18, 43 measurements from USGS well USGS-362450099383101 (22n-23w-03 Add 1), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Ellis County compares nationally
Ellis County sits at rank 733rd 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. Ellis County, Oklahoma is home to about 3,601 people. See the fastest-moving counties guide for how Ellis County stacks up against the most extreme cases nationally.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Ellis 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.