Tazewell County, IL Water Table Trend
Tazewell County, IL: what the water table is actually doing
Over 30 years of USGS readings, the well tracking Tazewell County's aquifer is declining, slower than most declining counties: 0.7 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Tazewell County's source well, in detail
Depth to water at the last reading was 35.5 ft below land surface. Readings span 1993-12-13 to 2024-01-18, 188 measurements from USGS well USGS-401921089282102 (22n3w-29.8a2 (Mth-17n)), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Tazewell County compares nationally
Tazewell County sits at rank 1007th 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. Tazewell County, Illinois is home to about 129,821 people. See the fastest-moving counties guide for how Tazewell County stacks up against the most extreme cases nationally.
If you own a well in Tazewell County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Tazewell County, that trend is real, not assumed: 0.7 ft per decade over 30 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Tazewell 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.