Hardin County, OH Water Table Trend
Hardin County's groundwater trend, from USGS's own readings
Over 56 years of USGS readings, the well tracking Hardin County's aquifer is holding roughly steady: 0.4 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Hardin County's source well, in detail
Depth to water at the last reading was 14.1 ft below land surface. Readings span 1970-03-18 to 2026-02-11, 142 measurements from USGS well OH015-404648083412600 (Hn-2a Oh), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Hardin County compares nationally
Hardin County sits at rank 904th 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. Hardin County, Ohio is home to about 30,402 people. See the fastest-moving counties guide for how Hardin 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 Hardin 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.