⟁ Illinois Well Data field records · 2026 survey

Illinois Well Data › Jefferson County

Jefferson County, Illinois: well depth, yield & drilling cost

✓ 650 ISGS records · verified 2026-10-12

70 ftmedian well depth
33 ft–118 fttypical depth range
7 gpmmedian yield (327 tests)

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How deep are wells in Jefferson County, Illinois?

The median drilled well depth in Jefferson County is 70 ft, based on 646 wells with recorded depths in the state ISGS database. Half of all wells fall between 33 ft and 118 ft; 90% are shallower than 200 ft. Wells drilled since 2016 have a median depth of —.

How much does it cost to drill a well in Jefferson County?

Applying published per-foot rates to the local median depth of 70 ft: drilling and casing alone typically runs $1,750–$4,550; a complete system including pump, pressure tank, and hookup typically runs $4,200–$7,000. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in Jefferson County?

Few static water level measurements are recorded for this county.

How much water do wells in Jefferson County produce?

The median tested yield is 7 gpm (middle half: 3 gpm–12 gpm), from 327 pump tests. A typical household needs 5–10 gpm.

Drilled depth distribution

0–50 ft 251 50–100 ft 157 100–150 ft 128 150–200 ft 39 200–300 ft 37 300–400 ft 14 400–600 ft 11 600+ ft 9
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Well records by ZIP code in Jefferson County

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

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.