
D&T Pump & Well Service
Gays Mills, WI54631
Typical Gays Mills area wells pass through a thin surficial clay layer, underlain by substantial limestone/dolomite, then significant shale and/or sandstone, with water yields primarily sourced from the limestone/dolomite and upper sandstone.
Showing contractors within 60 miles of Gays Mills. 23 results found.









A geological estimate for the Gays Mills area.
Typical Well Depth
Static Water Level
Recommended Method
Based on regional well logs, the most common sequence begins with a few feet of clay or soil, followed by a thick zone of limestone/dolomite (with some broken/creviced and softer sections), transitioning to either shale or sandstone. In deeper wells, hard shale generally underlies the limestone, with hard sandstone sometimes beneath the shale. Typical residential wells are cased past the thick limestone and into upper shale/sandstone, with static water levels and yields suitable for household supply (5-20 GPM). High-capacity wells may be drilled deeper into basal sandstones.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 6 ft | Clay/Soil | Red to brown clay, dirt, or silty soil, occasionally with loose rock. | Color: Brown/red Hardness: Soft |
| 6 – 100 ft | Limestone/Dolomite | Mainly limestone/dolomite, variable zones of broken/creviced and soft/loose limestone, can include hard segments; major aquifer. | Color: Light gray to tan Hardness: Hard |
| 100 – 200 ft | Shale (occasional voids/transition zones) | Shale, often with transition from fractured limestone or minor sandstone/voids. | Color: Yellow/gray Hardness: Medium to soft |
| 200 – 250 ft | Sandstone | Fine to medium sandstone, sometimes interbedded with shale, upper part often yields good water. | Color: White/tan Hardness: Medium-hard |
| 250 – 330 ft | Hard Shale/Hardened Sandstone | Hard shale and/or hard, cemented sandstone, often deeper zones in high-capacity wells. | Color: Gray Hardness: Hard |