Marion County, OH Water Table Trend
Is the water table dropping in Marion County, OH?
Marion County's representative monitoring well shows depth to water declining, slower than most declining counties, a fitted trend of 0.8 ft per decade over 61 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Marion County's source well, in detail
Depth to water at the last reading was 38.2 ft below land surface. Readings span 1965-10-01 to 2026-07-16, 71 measurements from USGS well OH015-403601083110400 (Mn-2 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 Marion County compares nationally
Marion County sits at rank 1043rd 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. Marion County, Ohio is home to about 64,976 people. See the fastest-moving counties guide for how Marion County stacks up against the most extreme cases nationally.
If you own a well in Marion County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Marion County, that trend is real, not assumed: 0.8 ft per decade over 61 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Marion 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.