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Well Drillers Near Oconomowoc, Wisconsin

Typical Oconomowoc-area wells encounter a surficial layer of clay or stony clay, followed by thick sand/gravel, locally interbedded with some clay, and frequently transition into limestone or dolomite bedrock at depths greater than ~110-130 ft.

Showing contractors within 60 miles of Oconomowoc. 48 results found.

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C&C Pumps

1480 WI, Hartford, WI 53027

Phone: (262) 789-7334
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View Local Geology Report ▼

A geological estimate for the Oconomowoc area.

105 ft

Typical Well Depth

25 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

The representative geologic profile for Oconomowoc and the surrounding area, based on sampled well logs, generally consists of about 0-10 feet of clayey or stony material overlying a substantial sand and gravel aquifer (often with intermittent silt or clay layers) extending from around 10 feet to ~110-130 feet. In deeper and southern/western locations, a clay or clay-with-gravel layer may occur from about 40 feet to 125 feet. Below these unconsolidated sediments, limestone (or dolomite) bedrock is consistently encountered, serving as an alternate aquifer, especially for higher capacity or deeper wells. The static water level most commonly ranges from 13 to 35 feet below ground. Residential wells typically end within the deep sand/gravel or just at the top of bedrock, usually between 50 and 125 ft deep to reliably yield 5-15+ gallons per minute.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 10 ftClay/Stoney Clay/BouldersCaving to non-caving, brown/grey mottled, variable stoniness and occasional boulders.Color: Brown-grey
Hardness: Soft to firm
10 – 45 ftSand & Gravel with minor clayClean sand and gravel, mostly water-bearing, may include sublayers of silt or grading from coarse to fine, occasional traces of clay.Color: Yellow/grey/tan
Hardness: Loose to medium
45 – 80 ftInterbedded sand, gravel, and claySome intervals of more clayey gravel, otherwise generally sandy/gravelly, water-bearing.Color: Grey/tan
Hardness: Loose to stiff (clay)
80 – 125 ftClay with sand/gravel and possible tillBecomes more clay-dominated with depth in some areas, may have minor boulders, gravel stringers, or silt—transitional to deeper aquifer or bedrock.Color: Grey/tan/brown
Hardness: Firm to hard (clay); loose (sand stringers)
125 – 210 ftLimestone/Dolomite BedrockMassive, hard bedrock, fractured zones may be water-bearing. Aquifer for deeper or high capacity wells.Color: Buff/light grey
Hardness: Hard