Saline County, IL Water Table Trend
Saline County's groundwater trend, from USGS's own readings
Saline County's long-term well puts the trend at 0.3 ft per decade, holding roughly steady, based on 425 measurements since 1984.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Saline County's source well, in detail
Depth to water at the last reading was 9.9 ft below land surface. Readings span 1984-08-07 to 2026-10-07, 425 measurements from USGS well USGS-374453088261701 (9s7e-9.4a (Se Illinois College Crn)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Saline County compares nationally
Saline County sits at rank 861st 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. Saline County, Illinois is home to about 22,826 people. See the fastest-moving counties guide for how Saline 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 Saline 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.