South Dakota Well Data › Clay County

Clay County, South Dakota: well depth, water level & drilling cost

Name: Clay County, South Dakota water well statistics
Creator: South Dakota Well Data
License: https://creativecommons.org/licenses/by/4.0/

✓ 548 SD DANR records · verified 2026-08-24

110 ftmedian well depth

90 ft–145 fttypical depth range

22 ftmedian static water level

115 ftmedian depth since 2016

How deep are wells in Clay County, South Dakota?

The median drilled well depth in Clay County is 110 ft, based on 547 wells with recorded depths in the state SD DANR database. Half of all wells fall between 90 ft and 145 ft; 90% are shallower than 200 ft. Wells drilled since 2016 have a median depth of 115 ft.

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

Applying published per-foot rates to the local median depth of 115 ft: drilling and casing alone typically runs $2,875–$7,475; a complete system including pump, pressure tank, and hookup typically runs $6,900–$11,500. Actual quotes depend on site access, geology, and casing requirements.

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Drilled depth distribution

0–50 ft 82 50–100 ft 93 100–150 ft 238 150–200 ft 71 200–300 ft 29 300–400 ft 18 400–600 ft 13 600+ ft 3

Who drills wells in Clay County?

Companies by number of wells completed in this county, per the completion reports South Dakota drillers file with DANR.

Driller	Wells since 2016
4 Boys TT, LLC DBA HEINE ELECTRIC & IRRIGATION	38
THEIN WELL COMPANY, INC.	18
LAYNE CHRISTENSEN CO	7
CHRISTENSEN WELL & IRRIGATION,	6
SAM WELL COMPANY	4
QUALITY WELL SERVICE LLC	3
GEOTEK ENGINEERING & TESTING	3
ALTON WELL	2

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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.