Well Drillers Near Rapid City, South Dakota
Typical Rapid City well log: clay-rich overburden, sand/gravel and/or weathered limestone, underlain by shale and limestone bedrock. Most residential wells reach limestone aquifers at ~120-300 ft. Water table is generally 10-60 ft below grade.
Showing contractors within 60 miles of Rapid City. 18 results found.
- Typical depth
- 220 ft
- Water table
- 45 ft
- Contractors
- 18
18 Contractors
Grimm's Pump & Industrial Supply
Taylor Drilling Company
WaterTree | Drinking Water • Water Softeners • Water Treatment
Geo Enterprises, Inc.
Alexander Drilling Company
Scion Drilling LLC
Dependable Well Service
Johnathan Johnson Well Service
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View Local Geology Report
A geological estimate for the Rapid City area.
- Typical Well Depth
- 220 ft
- Static Water Level
- 45 ft
- Recommended Method
- Rotary - Mud Circulation
Detailed Summary
The representative geological profile for the Rapid City region includes a surficial unit of fill, topsoil, or brown clay (often mixed with gravel or cobbles) extending to 3-10 ft. Below this, a clay-rich or silty sandy gravel (sometimes with boulders or limestone fragments) forms the next layer, typically reaching 10-40 ft. Weathered shale or fat clay is consistently encountered beneath the sand/gravel, often extending to 60-120 ft. The principal aquifer is usually contained within well-cemented limestone and interbedded sandstones, often beginning near 120 ft (Minnelusa or analogous formations) and extending as deep as 300 ft or more, locally underlain by additional sandstones. The static water level is most commonly reported 20-85 ft below surface. Domestic wells for 5-15+ GPM are typically completed at 200-260 ft.
Expected Geological Layers
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 3 ft | Topsoil/Fill | Brown clay, local fill, or topsoil with some pebbles or concrete/asphalt in disturbed areas. | Color: Brown, dark brown Hardness: Soft |
| 3 – 12 ft | Clay with Gravel/Cobbles | Brown or olive clay, silty sand, commonly with subrounded pebbles/cobbles; base course or sandy fat clay, local gravel. | Color: Brown, olive-brown Hardness: Firm-plastic |
| 12 – 40 ft | Sandy Gravel/Fat Clay | Rusty brown, dense sandy gravel with silty/clayey matrix; common cobbles, some black staining, moisture increases at base. | Color: Rusty brown, dark brown Hardness: Dense |
| 40 – 120 ft | Weathered Shale/Fat Clay | Dark gray to olive-brown weathered shale or stiff high-plasticity clay; some sand or gravel lenses, gradual transition to limestone. | Color: Dark gray, olive brown Hardness: Stiff-hard |
| 120 – 200 ft | Limestone (Minnelusa/analog) | Light to off-white, hard, well-cemented limestone bedrock with minor interbedded sandstones or shale; principal aquifer unit. | Color: Light to off-white Hardness: Hard |
| 200 – 308 ft | Interbedded Sandstone and Limestone | Red/yellow sandstone, interbedded with limestone streaks, minor shale partings; transition to lower pink sandstone at base. | Color: Red, yellow, pink Hardness: Hard |