Illinois Well Data › St. Clair County
St. Clair County, Illinois: well depth, yield & drilling cost
✓ 4,597 ISGS records · verified 2026-08-20
How deep are wells in St. Clair County, Illinois?
The median drilled well depth in St. Clair County is 79 ft, based on 4,546 wells with recorded depths in the state ISGS database. Half of all wells fall between 42 ft and 238 ft; 90% are shallower than 342 ft. Wells drilled since 2016 have a median depth of 100 ft.
How much does it cost to drill a well in St. Clair County?
Applying published per-foot rates to the local median depth of 100 ft: drilling and casing alone typically runs $2,500–$6,500; a complete system including pump, pressure tank, and hookup typically runs $6,000–$10,000. Actual quotes depend on site access, geology, and casing requirements.
Free for property owners. We route your request only to licensed drillers who actually file well logs in St. Clair County — never sold elsewhere.
What is the static water level in St. Clair County?
Few static water level measurements are recorded for this county.
How much water do wells in St. Clair County produce?
The median tested yield is 15 gpm (middle half: 8 gpm–40 gpm), from 1,222 pump tests. A typical household needs 5–10 gpm.
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Drilled depth distribution
Who drills wells in St. Clair 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 |
|---|---|
| Haake, Ralph | 85 |
| Dohrman, Dale Raymond | 36 |
| Beckett, Donald | 32 |
| Schmalfeldt, Todd | 31 |
| Ray Mueller | 12 |
| Gebke, Randy | 10 |
| Dowdy, Tony Jr. | 9 |
| Harriss, Chuck | 8 |
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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.