Illinois Well Data › Cook County
Cook County, Illinois: well depth, yield & drilling cost
✓ 11,688 ISGS records · verified 2026-08-20
How deep are wells in Cook County, Illinois?
The median drilled well depth in Cook County is 200 ft, based on 11,486 wells with recorded depths in the state ISGS database. Half of all wells fall between 151 ft and 250 ft; 90% are shallower than 340 ft. Wells drilled since 2016 have a median depth of 200 ft.
How much does it cost to drill a well in Cook County?
Applying published per-foot rates to the local median depth of 200 ft: drilling and casing alone typically runs $5,000–$13,000; a complete system including pump, pressure tank, and hookup typically runs $12,000–$20,000. 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 Cook County — never sold elsewhere.
What is the static water level in Cook County?
Few static water level measurements are recorded for this county.
How much water do wells in Cook County produce?
The median tested yield is 18 gpm (middle half: 10 gpm–25 gpm), from 7,684 pump tests. A typical household needs 5–10 gpm.
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Drilled depth distribution
Who drills wells in Cook 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 |
|---|---|
| Schmalfeldt, Todd | 55 |
| Brad Snelten | 55 |
| Snelten, Greg | 30 |
| Knierim, Ken/K & K Well Drlg. | 23 |
| Huemann, Joseph J. | 23 |
| Stinnett, David | 22 |
| Will County Well & Pump | 20 |
| Schwall, John J. | 14 |
See every driller with wells on record in Cook County, ranked →
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See every recorded well near any address — depths, water levels, yields, original driller's logs — in a one-time report.
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.