South Dakota Well Data › Day County
Day County, South Dakota: well depth, water level & drilling cost
✓ 576 SD DANR records · verified 2026-10-19
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How deep are wells in Day County, South Dakota?
The median drilled well depth in Day County is 125 ft, based on 576 wells with recorded depths in the state SD DANR database. Half of all wells fall between 57 ft and 240 ft; 90% are shallower than 428 ft. Wells drilled since 2016 have a median depth of 110 ft.
How much does it cost to drill a well in Day County?
Applying published per-foot rates to the local median depth of 125 ft: drilling and casing alone typically runs $3,125–$8,125; a complete system including pump, pressure tank, and hookup typically runs $7,500–$12,500. Actual quotes depend on site access, geology, and casing requirements.
Drilled depth distribution
Who drills wells in Day County?
Companies by number of wells completed in this county, per the completion reports South Dakota drillers file with DANR.
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Well records by ZIP code in Day County
Median depth, water level, and yield for each ZIP code with recorded wells.
- Waubay (57273) — 154 wells, median 70 ft
- Webster (57274) — 131 wells, median 166 ft
- Bristol (57219) — 73 wells, median 115 ft
- Grenville (57239) — 52 wells, median 81 ft
Method: medians computed from SD DANR records (SD DANR NR68 well completion reports, water wells only (monitoring, test-hole, geothermal-loop and dewatering records excluded); depths 0-5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.