Illinois Well Data › Knox County
Knox County, Illinois: well depth, yield & drilling cost
✓ 1,864 ISGS records · verified 2026-10-12
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How deep are wells in Knox County, Illinois?
The median drilled well depth in Knox County is 180 ft, based on 1,838 wells with recorded depths in the state ISGS database. Half of all wells fall between 100 ft and 389 ft; 90% are shallower than 610 ft. Wells drilled since 2016 have a median depth of 290 ft.
How much does it cost to drill a well in Knox County?
Applying published per-foot rates to the local median depth of 180 ft: drilling and casing alone typically runs $4,500–$11,700; a complete system including pump, pressure tank, and hookup typically runs $10,800–$18,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Knox County?
Few static water level measurements are recorded for this county.
How much water do wells in Knox County produce?
The median tested yield is 10 gpm (middle half: 6 gpm–20 gpm), from 1,517 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Knox 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 |
|---|---|
| Allen, Joseph | 41 |
| Dryden, Michael | 14 |
| Gingerich, Corwin | 8 |
| Cosby, Doug | 3 |
| Wiesenhofer, Andrew | 2 |
| Bassham, Billy | 2 |
| Gelement, Val | 1 |
| Stoll, Austen | 1 |
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Well records by ZIP code in Knox County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Knoxville (61448) — 267 wells, median 125 ft
- Abingdon (61410) — 207 wells, median 195 ft
- Henderson (61439) — 188 wells, median 145 ft
- Dahinda (61428) — 133 wells, median 245 ft
- Maquon (61458) — 120 wells, median 194 ft
- Gilson (61436) — 119 wells, median 220 ft
- Yates City (61572) — 110 wells, median 60 ft
- Williamsfield (61489) — 102 wells, median 130 ft
- Galesburg (61402) — 102 wells, median 101 ft
- Rio (61472) — 88 wells, median 478 ft
- Saint Augustine (61474) — 83 wells, median 225 ft
- Galesburg (61401) — 67 wells, median 100 ft
- Victoria (61485) — 63 wells, median 498 ft
- East Galesburg (61430) — 62 wells, median 155 ft
- Wataga (61488) — 56 wells, median 345 ft
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.