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Well Drillers Near Custer, South Dakota

Typical Custer area wells encounter a shallow unconsolidated drift layer, underlain by thick sequences of gray and brown schist (often fractured and water-bearing).

Showing contractors within 60 miles of Custer. 16 results found.

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A geological estimate for the Custer area.

120 ft

Typical Well Depth

70 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

Based on well logs from across the Custer area, the most common lithological sequence is an initial unconsolidated or drift cover (often referred to as 'dirt', 'drift', or 'overburden'), generally less than 10-15 feet thick. Beneath this cover lies a sequence of schist, varying in color from gray to brown, often with notable fracturing that enhances water yield. The schist constitutes the main aquifer-bearing formation, typically extending from just beneath the drift down to depths of 120-180 feet or more. Fractured zones within the schist commonly provide the best groundwater yields. Outlier lithologies and thin interbeds (such as minor quartzite or slate) are seldom significant and not included in this representative profile.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 10 ftUnconsolidated drift / overburdenLoose soil, sand, minor clay. Initial cover before rock.Color: Brown to gray
Hardness: Very loose
10 – 120 ftBrown and gray schist (moderately to highly fractured)Metamorphic rock, occasionally fractured producing water; gray and brown colors; occasional minor quartzite/sandy layers.Color: Gray, brown
Hardness: Hard, but water-bearing when fractured
120 – 180 ftGray and brown schist (deeper, less fractured)Primarily schist continuing to depth; generally less fractured, but some wells report water at these levels.Color: Gray, brown
Hardness: Hard