⟁ Illinois Well Data field records · 2026 survey

Illinois Well Data › Clay County

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

✓ 1,260 ISGS records · verified 2026-08-20

91 ftmedian well depth
40 ft–140 fttypical depth range
10 gpmmedian yield (597 tests)

How deep are wells in Clay County, Illinois?

The median drilled well depth in Clay County is 91 ft, based on 1,251 wells with recorded depths in the state ISGS database. Half of all wells fall between 40 ft and 140 ft; 90% are shallower than 180 ft. Wells drilled since 2016 have a median depth of 202 ft.

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

Applying published per-foot rates to the local median depth of 202 ft: drilling and casing alone typically runs $5,050–$13,130; a complete system including pump, pressure tank, and hookup typically runs $12,120–$20,200. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Clay County?

Few static water level measurements are recorded for this county.

How much water do wells in Clay County produce?

The median tested yield is 10 gpm (middle half: 4 gpm–20 gpm), from 597 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 408 50–100 ft 238 100–150 ft 347 150–200 ft 181 200–300 ft 55 300–400 ft 2 400–600 ft 2 600+ ft 18

Who drills wells in Clay 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
Beckett, Donald3
Hemmen, Jake2
Haake, Ralph1
Harriss, Chuck1
Geotherm Drilling Co. Inc.1

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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.