Missouri Well Data › St. Charles County
St. Charles County, Missouri: well depth, water level & drilling cost
✓ 3,389 MoDNR records · verified 2026-10-12
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How deep are wells in St. Charles County, Missouri?
The median drilled well depth in St. Charles County is 565 ft, based on 3,253 wells with recorded depths in the state MoDNR database. Half of all wells fall between 410 ft and 680 ft; 90% are shallower than 740 ft. Wells drilled since 2016 have a median depth of 600 ft.
How much does it cost to drill a well in St. Charles County?
Applying published per-foot rates to the local median depth of 600 ft: drilling and casing alone typically runs $15,000–$39,000; a complete system including pump, pressure tank, and hookup typically runs $36,000–$60,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in St. Charles County?
The median static water level is 160 ft below ground surface (middle half of wells: 120 ft–210 ft), from 3,096 measurements.
How much water do wells in St. Charles County produce?
The median tested yield is 50 gpm (middle half: 30 gpm–75 gpm), from 3,064 pump tests. A typical household needs 5–10 gpm.
Drilled depth distribution
Who drills wells in St. Charles County?
Drillers by number of wells certified in this county, per well certification records filed with the Missouri Geological Survey. Missouri licenses individual drillers rather than companies, so these are the people who signed the certification.
| Driller | Wells since 2016 |
|---|---|
| DANIEL FLYNN | 227 |
| JOSHUA LAVY | 158 |
| DAVID GUZY | 154 |
| ALAN BURGESS | 74 |
| JEFF HATFIELD | 66 |
| David Weatherford | 56 |
| BRAD LAVY | 46 |
| KEITH JULIAN | 32 |
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Well records by ZIP code in St. Charles County
Median depth, water level, and yield for each ZIP code with recorded wells.
- O Fallon (63366) — 833 wells, median 665 ft
- Foristell (63348) — 607 wells, median 540 ft
- Wentzville (63385) — 477 wells, median 625 ft
- New Melle (63365) — 295 wells, median 560 ft
- Defiance (63341) — 155 wells, median 450 ft
- Lake Saint Louis (63367) — 128 wells, median 680 ft
- Saint Peters (63376) — 108 wells, median 82 ft
- Augusta (63332) — 103 wells, median 470 ft
- Saint Charles (63301) — 86 wells, median 80 ft
- Portage Des Sioux (63373) — 65 wells, median 80 ft
- Cottleville (63338) — 52 wells, median 700 ft
- O Fallon (63368) — 50 wells, median 635 ft
Method: medians computed from MoDNR records (MoDNR certified water wells; depths 0-5,000 ft, with the file's 99999.9 and 88888 sentinel values excluded rather than clamped). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.