Illinois Well Data › St. Clair County

St. Clair County, Illinois: well depth, yield & drilling cost

Name: St. Clair County, Illinois water well statistics
Creator: Illinois Well Data
License: https://creativecommons.org/licenses/by/4.0/

✓ 5,727 ISGS records · verified 2026-10-12

80 ftmedian well depth

42 ft–242 fttypical depth range

18 gpmmedian yield (1,557 tests)

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How deep are wells in St. Clair County, Illinois?

The median drilled well depth in St. Clair County is 80 ft, based on 5,663 wells with recorded depths in the state ISGS database. Half of all wells fall between 42 ft and 242 ft; 90% are shallower than 343 ft. Wells drilled since 2016 have a median depth of 110 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 110 ft: drilling and casing alone typically runs $2,750–$7,150; a complete system including pump, pressure tank, and hookup typically runs $6,600–$11,000. Actual quotes depend on site access, geology, and casing requirements.

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 18 gpm (middle half: 8 gpm–40 gpm), from 1,557 pump tests. A typical household needs 5–10 gpm.

Drilled depth distribution

0–50 ft 1,896 50–100 ft 1,216 100–150 ft 412 150–200 ft 255 200–300 ft 980 300–400 ft 555 400–600 ft 318 600+ ft 31

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	90
Dohrman, Dale Raymond	39
Beckett, Donald	37
Schmalfeldt, Todd	31
Ray Mueller	12
Gebke, Randy	11
Dowdy, Tony Jr.	9
Greg A. Evans	8

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Well records by ZIP code in St. Clair County

Median depth, water level, and yield for each ZIP code with recorded wells.

Millstadt (62260) — 969 wells, median 259 ft
Mascoutah (62258) — 426 wells, median 42 ft
Freeburg (62243) — 374 wells, median 52 ft
O Fallon (62269) — 349 wells, median 41 ft
Scott Air Force Base (62225) — 343 wells, median 41 ft
Smithton (62285) — 272 wells, median 222 ft
Belleville (62223) — 242 wells, median 194 ft
New Athens (62264) — 232 wells, median 43 ft
Lebanon (62254) — 224 wells, median 44 ft
Lovejoy (62059) — 194 wells, median 250 ft
East Saint Louis (62206) — 192 wells, median 210 ft
Belleville (62220) — 176 wells, median 216 ft
East Saint Louis (62202) — 176 wells, median 80 ft
Saint Libory (62282) — 166 wells, median 46 ft
Summerfield (62289) — 140 wells, median 182 ft
Dupo (62239) — 129 wells, median 345 ft
East Carondelet (62240) — 112 wells, median 82 ft
Belleville (62221) — 107 wells, median 39 ft
Lenzburg (62255) — 99 wells, median 44 ft
Marissa (62257) — 87 wells, median 55 ft
Caseyville (62232) — 84 wells, median 98 ft
East Saint Louis (62201) — 74 wells, median 108 ft
East Saint Louis (62207) — 55 wells, median 45 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.