BLC Well Drilling & Pump Service Ltd.
Milltown, WI54858
Milltown area wells typically encounter surficial topsoil, followed by thick sand and gravel with local clay zones, and underlain at depth by sandstone and/or traprock.
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A geological estimate for the Milltown area.
Typical Well Depth
Static Water Level
Recommended Method
A representative geological profile for the Milltown region, based on a synthesis of multiple well logs, generally shows a surface layer of topsoil or thin organic deposits, underlain by extensive sand and gravel (often with minor clay or hardpan interbeds), sometimes transitioning into clay layers. Below 60–80 ft, wells most commonly encounter sandstone (sandy rock or sandrock) and in some cases a deeper traprock or basaltic formation extending to the bottom of well borings. Water is generally encountered at moderate depths within the sand/gravel or upper sandstone, yielding adequate supply for residential wells at moderate depths.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 2 ft | Topsoil | Thin layer of organic-rich soil, silt, or loam | Color: Brown, dark Hardness: Soft |
| 2 – 22 ft | Clay/clayey sand or hardpan (locally with gravel) | Dense clay, sandy clay, or clay intermixed with gravel; occasional hardpan horizons | Color: Gray-yellow Hardness: Hard |
| 22 – 62 ft | Sand and Gravel | Coarse to medium sand and gravel, sometimes silty or with interbedded clay; primary aquifer zone for domestic wells | Color: Yellow to gray Hardness: Medium |
| 62 – 83 ft | Sandstone/Sandrock | Soft to firm sandstone or sandy rock formation, sometimes noted as silty or fine/coarse textured | Color: Light brown, gray Hardness: Soft-Firm |
| 83 – 110 ft | Gravel/Basement Rock (Traprock or Basalt) | Hard crystalline ('traprock'), or coarse gravel at base of the well; less common but present in deeper wells | Color: Dark gray-black Hardness: Very Hard |