⟁ Illinois Well Data field records · 2026 survey

Illinois Well Data › Union County

Union County, Illinois: well depth, yield & drilling cost

✓ 1,592 ISGS records · verified 2026-08-20

250 ftmedian well depth
147 ft–392 fttypical depth range
10 gpmmedian yield (801 tests)

How deep are wells in Union County, Illinois?

The median drilled well depth in Union County is 250 ft, based on 1,586 wells with recorded depths in the state ISGS database. Half of all wells fall between 147 ft and 392 ft; 90% are shallower than 540 ft. Wells drilled since 2016 have a median depth of 297 ft.

How much does it cost to drill a well in Union County?

Applying published per-foot rates to the local median depth of 297 ft: drilling and casing alone typically runs $7,425–$19,305; a complete system including pump, pressure tank, and hookup typically runs $17,820–$29,700. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Union County?

Few static water level measurements are recorded for this county.

How much water do wells in Union County produce?

The median tested yield is 10 gpm (middle half: 7 gpm–15 gpm), from 801 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 17 50–100 ft 148 100–150 ft 246 150–200 ft 173 200–300 ft 377 300–400 ft 241 400–600 ft 269 600+ ft 115

Who drills wells in Union County?

Companies and licensed drillers by number of wells logged in this county, per records filed with the Illinois State Geological Survey.

DrillerWells since 2016
Beanland, Glen49
Beanland, Leonard Ralph38
Gregory Horman5
Horman, Paul3
Durbin, Kandra M.3
Greg A. Evans1
Harriss, Chuck1

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Method: medians computed from ISGS records (ISGS water wells; engineering, mineral and stratigraphic test borings, mine shafts, outcrops and monitoring wells are excluded, as are wells the survey records as plugged; depths 0-5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.