⟁ Illinois Well Data field records · 2026 survey

Illinois Well Data › Jefferson County

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

✓ 632 ISGS records · verified 2026-08-20

70 ftmedian well depth
33 ft–115 fttypical depth range
7 gpmmedian yield (320 tests)

How deep are wells in Jefferson County, Illinois?

The median drilled well depth in Jefferson County is 70 ft, based on 628 wells with recorded depths in the state ISGS database. Half of all wells fall between 33 ft and 115 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.

Get quotes from drillers active in Jefferson County

Free for property owners. We route your request only to licensed drillers who actually file well logs in Jefferson County — never sold elsewhere.

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 320 pump tests. A typical household needs 5–10 gpm.

Pull every recorded well near a Jefferson County address — $29

Drilled depth distribution

0–50 ft 246 50–100 ft 154 100–150 ft 123 150–200 ft 39 200–300 ft 33 300–400 ft 14 400–600 ft 11 600+ ft 8
Looking at a specific property in Jefferson County?

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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.