Marion County, IN Water Table Trend
Is the water table dropping in Marion County, IN?
Marion County's long-term well puts the trend at 0.3 ft per decade, holding roughly steady, based on 241 measurements since 1987.
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 34.8 ft below land surface. Readings span 1987-09-22 to 2026-09-14, 241 measurements from USGS well USGS-394632086092701 (Marion 35 (Ma 35)), 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 889th 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, Indiana is home to about 981,628 people. See the fastest-moving counties guide for how Marion 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 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.