Illinois Well Data › Winnebago County
Winnebago County, Illinois: well depth, yield & drilling cost
✓ 12,176 ISGS records · verified 2026-10-12
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How deep are wells in Winnebago County, Illinois?
The median drilled well depth in Winnebago County is 135 ft, based on 11,957 wells with recorded depths in the state ISGS database. Half of all wells fall between 77 ft and 190 ft; 90% are shallower than 250 ft. Wells drilled since 2016 have a median depth of 205 ft.
How much does it cost to drill a well in Winnebago County?
Applying published per-foot rates to the local median depth of 205 ft: drilling and casing alone typically runs $5,125–$13,325; a complete system including pump, pressure tank, and hookup typically runs $12,300–$20,500. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in Winnebago County?
Few static water level measurements are recorded for this county.
How much water do wells in Winnebago County produce?
The median tested yield is 10 gpm (middle half: 10 gpm–15 gpm), from 8,945 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in Winnebago 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 |
|---|---|
| Martin, Charles | 77 |
| Smith, Allen E. | 72 |
| Bull Well Drilling Inc | 36 |
| Deppe, Edward M. | 16 |
| Beaman, Jessie J. | 12 |
| Schuur, Bill | 11 |
| Skinner, Todd | 10 |
| Municipal Well & Pump, Inc. | 7 |
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Well records by ZIP code in Winnebago County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Roscoe (61073) — 3,066 wells, median 125 ft
- Rockford (61109) — 1,620 wells, median 148 ft
- Rockford (61112) — 1,168 wells, median 140 ft
- South Beloit (61080) — 842 wells, median 81 ft
- Machesney Park (61115) — 726 wells, median 100 ft
- Rockford (61102) — 656 wells, median 145 ft
- Rockton (61072) — 651 wells, median 72 ft
- Winnebago (61088) — 498 wells, median 240 ft
- Cherry Valley (61016) — 454 wells, median 120 ft
- Rockford (61106) — 393 wells, median 145 ft
- Shirland (61079) — 335 wells, median 160 ft
- Rockford (61101) — 311 wells, median 122 ft
- Pecatonica (61063) — 286 wells, median 200 ft
- Rockford (61108) — 228 wells, median 150 ft
- Durand (61024) — 193 wells, median 191 ft
- Seward (61077) — 139 wells, median 159 ft
- Rockford (61107) — 131 wells, median 150 ft
- Loves Park (61111) — 120 wells, median 119 ft
- Rockford (61104) — 64 wells, median 100 ft
- Rockford (61103) — 56 wells, median 132 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.