⟁ Illinois Well Data field records · 2026 survey

Illinois Well Data › Dekalb County

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

✓ 3,554 ISGS records · verified 2026-08-20

202 ftmedian well depth
160 ft–270 fttypical depth range
20 gpmmedian yield (2,186 tests)

How deep are wells in Dekalb County, Illinois?

The median drilled well depth in Dekalb County is 202 ft, based on 3,512 wells with recorded depths in the state ISGS database. Half of all wells fall between 160 ft and 270 ft; 90% are shallower than 400 ft. Wells drilled since 2016 have a median depth of 200 ft.

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

Applying published per-foot rates to the local median depth of 200 ft: drilling and casing alone typically runs $5,000–$13,000; a complete system including pump, pressure tank, and hookup typically runs $12,000–$20,000. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Dekalb County?

Few static water level measurements are recorded for this county.

How much water do wells in Dekalb County produce?

The median tested yield is 20 gpm (middle half: 15 gpm–30 gpm), from 2,186 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 22 50–100 ft 167 100–150 ft 507 150–200 ft 915 200–300 ft 1,184 300–400 ft 352 400–600 ft 268 600+ ft 97

Who drills wells in Dekalb 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
Stone, Bradley W.31
Knierim, Ken/K & K Well Drlg.15
Matt Liberg8
Weirich, William Theodore6
Neely, Mark S.6
Nice, Mark E.6
Jablonski, John A.4
Roop, Randy/Jonas Martin Drlg.3

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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.