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Well Drillers Near Marion, South Dakota

The typical Marion area well passes through topsoil, yellow and blue/brown clays, with main aquifers in sand and gravel below 170-300 ft; final depths often reach 300-350 ft, with static water 50-80 ft below surface.

Showing contractors within 60 miles of Marion. 8 results found.

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A geological estimate for the Marion area.

180 ft

Typical Well Depth

60 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

Based on synthesis of multiple well logs in the Marion region of Turner County, SD, the typical geological sequence begins with a thin layer of topsoil, underlain by a considerable section of yellow and blue/brown clay (commonly 15-120 ft thick). This is followed by sand and local gravel/sandstone units, often intermittently layered with more clay. Deeper wells commonly penetrate additional clay and occasional till or hardpan before encountering thicker sand/gravel aquifers generally between 170 and 300 ft. Substantial yields (5–15+ GPM for residential use) are most often from sand/gravel layers in this interval. Bedrock or hard conglomerate (occasionally granite or cemented material) may be found below 300-350 ft. Static water levels are typically 50–80 ft below land surface. Typical residential wells are cased to the base of the aquifer layer.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 2 ftTopsoil/Fine Silty SandSoft, organic-rich, may include fill or fine sandColor: Black/Brown
Hardness: Soft
2 – 30 ftClay (Silty/Lean, sometimes yellow)Plasticky, sometimes mottled, may include a little gravelColor: Yellow/Brown
Hardness: Plastic/Soft
30 – 80 ftClay (Blue or Brown)Dense, low permeability, forms a confining unitColor: Blue/Brown/Gray
Hardness: Firm/Plastic
80 – 120 ftSand (Minor gravel, some blue/sandy clay)Fine to medium sand with localized clay or gravel, variably moistColor: Tan/Blue/Brown
Hardness: Loose/Medium
120 – 170 ftClay/Sandy ClayMostly clay with some sandy or gravelly lenses, forming aquitardColor: Blue/Brown/Gray
Hardness: Firm
170 – 300 ftSand & Gravel (Main aquifer zone)Medium to coarse sand with significant gravel, major water-bearing strata; some zones interlayered with thin clay or siltColor: Tan/Gray
Hardness: Loose/Medium
300 – 336 ftGravel/Clayey GravelSimilar to above, increasing gravel content, possibly with clay layersColor: Gray
Hardness: Medium
336 – 350 ftClay/Till/HardpanDense clay, occasional pebbly till or hardpan, forms lower aquitard; may act as base for casingColor: Gray/Brown
Hardness: Hard/Very Firm
350 – 490 ftHard Rock/Granite/Cemented Layer (locally variable, seldom used for water supply)Hard, cemented or granitic rock, not typically water-bearing in domestic wells in this regionColor: Red/Gray
Hardness: Very Hard