
Welser Well Drilling LLC
St Clair, MI48079
St Clair region wells commonly penetrate thick clay layers with occasional sand or hardpan lenses underlain by sandstone or gravelly layers, suitable for residential supply at 80-130 ft depth.
Showing contractors within 60 miles of St Clair. 34 results found.
A geological estimate for the St Clair area.
Typical Well Depth
Static Water Level
Recommended Method
Geologic profiles of water wells in St Clair County, MI, show a typical sequence beginning with a thin topsoil, followed by alternating lenses of yellow and gray clay (70-115 ft thick), sometimes interbedded with thin sand or hardpan. Beneath the clay, wells may encounter a water-bearing sand or a hardpan zone (gravel/clay mix), but the most consistent deeper formation is sandstone or, less commonly, shale. Most residential wells obtain 5-15+ GPM from sand/gravel zones or the upper part of the sandstone at depths of 80-130 ft. Static water levels are usually 30-40 ft below grade. Rotary with mud circulation and bentonite/cement grout is standard practice.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 1 ft | Topsoil | Brown-black organic topsoil | Color: Brown/black Hardness: Soft |
1 – 8 ft | Clay - Yellow | Yellow silty or sandy clay | Color: Yellow Hardness: Firm |
8 – 90 ft | Clay - Gray | Gray clay, occasionally layered with minor sand or silt lenses | Color: Gray Hardness: Firm/Hard |
90 – 120 ft | Hardpan / Mixed Clay/Gravel | Hard silty clay, occasionally with gravel or sand; sometimes noted as 'hardpan' or 'clay & gravel' | Color: Mixed gray/brown Hardness: Hard |
120 – 130 ft | Sand / Water-Bearing Sand or Sandstone Transition | Sand with increasing cementation—transition to sandstone or sometimes minor shale at top | Color: Yellow-brown Hardness: Loose to friable |
130 – 156 ft | Sandstone (or locally Shale/Sandstone mix) | Massive sandstone, sometimes interbedded with shale (rarely), functioning as the main aquifer base in deep wells | Color: Gray-yellow; black where organic/shale is present Hardness: Hard |