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Well Drillers Near Hartford, South Dakota

Hartford area geology is dominated by a surficial sequence of clay/silt overlying a thick, heterogeneous sand and gravel aquifer, with a lower confining clay unit. Residential wells for good yield (5-15+ GPM) are typically completed in the sand/gravel zone, 15–25 ft deep.

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

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A geological estimate for the Hartford area.

18 ft

Typical Well Depth

10 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

Based on a synthesis of well logs and test borings throughout the Hartford (Minnehaha County) area, the most representative geologic profile consists of an upper clay/silt (often mottled or silty clay) layer from surface to 2–4 ft, occasionally including some fill/topsoil. This is underlain by a medium-fine sand to very coarse sand and gravel aquifer, typically from ~4 ft to 15–23 ft. The sand/gravel unit is variably sorted, with finer sand lenses and pebble/cobble intervals, showing signs of moderate oxidation. Water table is generally at 9–15 ft. The sand/gravel is in turn underlain by a thick clay or silty clay (often gray-brown to gray) which serves as a confining bed below ~20–30 ft. Most residential and monitoring wells terminate within the sand/gravel. Casing depths, grout, and sealing procedures confirm this arrangement. Occasional thin silt or minor gravel zones occur but are less consistent. For 5–15+ GPM production, wells are typically 15–25 ft deep, screened in sand/gravel above the lower clay.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 2.5 ftFill/Topsoil/Silty ClayTopsoil, fill, and/or silty clay. Reddish-brown to black, damp, sometimes with some gravel; low permeability.Color: Dark brown to black
Hardness: Soft plastic
2.5 – 16 ftSand and Gravel (Principal Aquifer)Medium to very coarse sand, some fine sand lenses, with variable rounded gravel and occasional cobbles. Generally well to moderately well sorted but with localized silt or clay lenses. Most water-bearing. Thickness varies 10–18 ft. Minor oxidation. Some intervals show product odor in industrial areas.Color: Light brown, grayish, some orange-brown oxidation
Hardness: Loose/unconsolidated
16 – 24 ftClay/Silty Clay (Confining Unit)Dense clay or silty clay with local silt or sand stringers. Usually gray to brown, plastic; poor water yield. Occasional mottling.Color: Gray-brown to gray
Hardness: Stiff to plastic