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Well Drillers Near Tomah, Wisconsin

Tomah region wells typically encounter sand and clay overlying multiple sandstone units, with a transition from soft to hard/firm or color-variant sandstones below about 30–40 feet. Residential wells commonly terminate between 60–120 feet, tapping the upper sandstone for reliable yields.

Showing contractors within 60 miles of Tomah. 34 results found.

Kouba Group logo

Kouba Group

325 S Park St #2, Reedsburg, WI 53959

Phone: +1 866-799-1199
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View Local Geology Report ▼

A geological estimate for the Tomah area.

80 ft

Typical Well Depth

30 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

Based on synthesis from multiple well logs in Tomah and surrounding Monroe County, the region's geology is generally characterized by a surficial layer of sand (occasionally sand/clay or sandy clay) ranging from approximately 10–20 feet thick. This is underlain by soft, caving, or layered sandstone, often with silt or clay transitions, extending to about 60–90 feet. Below this depth, wells typically penetrate into firmer, harder, or lighter-colored (often white/tan) sandstone, which serves as the main aquifer. Shale may be present at greater depths in some locations but is not uniformly encountered. Wells constructed for residential use commonly reach total drilled depths of 60–120 feet, with static water levels averaging 10–50 feet below ground and sustainable yields in the 10–15+ GPM range. High-capacity municipal or commercial wells may be drilled deeper, up to 140 feet or more, targeting the lower sandstone aquifer.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 15 ftSand or Sandy ClaySurface sand, occasional sandy or silty clay, often loose and caving.Color: Tan / Buff
Hardness: Loose/Soft
15 – 35 ftSoft Sandstone / Mixed Sand and Silt/ClayTransition zone; may contain mixed sand, silt, clay or soft sandstone.Color: Yellow/Tan/Light
Hardness: Soft
35 – 60 ftSoft to Medium SandstoneMain aquifer zone begins here in many wells. Occasionally noted as layered, soft, or friable sandstone.Color: Tan/White/Yellow
Hardness: Soft-Medium
60 – 90 ftFirm/Hard SandstoneBecomes firmer, whiter, sometimes described as hard sandstone. Good aquifer.Color: Light/Tan/White
Hardness: Firm/Hard
90 – 120 ftWhite/Tan Sandstone (lower aquifer)High-yield portion of the aquifer, mostly uniform and competent sandstone.Color: White/Tan
Hardness: Hard
120 – 140 ftSandstone / Occasional Shale (deep wells only)Only some wells go this deep; may encounter shale, otherwise sandstone persists.Color: Gray/Green
Hardness: Firm/Hard