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Well Drillers Near Janesville, Wisconsin

Janesville area wells typically encounter a thick sequence of glacial sand, gravel, and some clay, sometimes underlain by hardpan or clay-rich layers, with occasional deeper limestone/dolomite or sandstone at depth. Most residential wells (5-15+ GPM) are completed at 120-160 ft. High-capacity wells or wells seeking more robust yields may need to reach 200+ ft, particularly when targeting coarser sand and gravel or entering bedrock.

Showing contractors within 60 miles of Janesville. 60 results found.

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Water Wells

6400 Lake Rd, Windsor, WI 53598

Phone: (608) 846-4697
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View Local Geology Report ▼

A geological estimate for the Janesville area.

140 ft

Typical Well Depth

90 ft

Static Water Level

Rotary - Mud Circulation

Recommended Method

Detailed Summary

Based on a representative sample of well logs from the Janesville region, the typical geologic section comprises, from the surface downward: an initial surficial layer of fill or topsoil giving way quickly to thick sequences of sand with intermittent layers of gravel, hardpan, and clay to average depths of 120–160 ft. In some locations, coarser sand and gravel extend even deeper, up to 200–220 ft. Harder bedrock layers such as sandstone or limestone/dolomite may be encountered around 130–140 ft or deeper, but are not universal. Most residential wells supplying 5–15+ GPM terminate in the coarser sand/gravel sequences before hitting bedrock. Static water levels range widely but are most commonly found between 57 and 120 ft below ground surface. Rotary - Mud Circulation is the dominant drilling method, with continuous steel casing and granular bentonite or neat cement grout seals to casing depth.

Expected Geological Layers

Depth (Feet)Formation TypeDescriptionCharacteristics
0 – 4 ftFill/Topsoil or Fine SandSurficial fill, topsoil, or fine sand layers
Hardness: Soft
4 – 20 ftSand & Gravel (with pockets of Clay/Hardpan)Alternating or mixed sand, gravel, and possible hardpan or clay
Hardness: Medium
20 – 120 ftSand (sometimes w/ Hardpan, Gravel, or Clay)Thick sand sequence, usually clean but interbedded with hardpan, clay, or occasional gravel/cobble beds
Hardness: Medium to Firm
120 – 160 ftGravelly Sand / Coarse Sand & GravelCoarse sand with increasing gravel, sometimes with boulders or stones, best aquifer zone
Hardness: Loose to firm
160 – 200 ftCoarse Sand & Gravel, w/some zones of Hardpan or ClayOccasionally very coarse with boulders, or locally separated by clayey intervals
Hardness: Firm
200 – 220 ftSandstone or Dolomite/Limestone (when present)Hard, indurated bedrock, present in some wells deeper than others; not always encountered in every location
Hardness: Hard