Illinois Well Data › Mercer County
Mercer County, Illinois: well depth, yield & drilling cost
✓ 1,579 ISGS records · verified 2026-08-20
How deep are wells in Mercer County, Illinois?
The median drilled well depth in Mercer County is 395 ft, based on 1,571 wells with recorded depths in the state ISGS database. Half of all wells fall between 123 ft and 470 ft; 90% are shallower than 515 ft. Wells drilled since 2016 have a median depth of 394 ft.
How much does it cost to drill a well in Mercer County?
Applying published per-foot rates to the local median depth of 394 ft: drilling and casing alone typically runs $9,850–$25,610; a complete system including pump, pressure tank, and hookup typically runs $23,640–$39,400. Actual quotes depend on site access, geology, and casing requirements.
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What is the static water level in Mercer County?
Few static water level measurements are recorded for this county.
How much water do wells in Mercer County produce?
The median tested yield is 25 gpm (middle half: 15 gpm–40 gpm), from 1,229 pump tests. A typical household needs 5–10 gpm.
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Drilled depth distribution
Who drills wells in Mercer County?
Companies and licensed drillers by number of wells logged in this county, per records filed with the Illinois State Geological Survey.
| Driller | Wells since 2016 |
|---|---|
| White, Matt | 42 |
| Allen, Joseph | 20 |
| Stoll, Austen | 18 |
| Gingerich, Corwin | 17 |
| Henry, John | 8 |
| Meyer, Seth | 7 |
| Gelement, Val | 7 |
| Harvey, Lucius | 5 |
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Free lookup Property report — $29Method: 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.