
Drillworx
Wausau, WI 54401
A typical Wausau-area well penetrates a surficial zone of clay (occasionally with gravel or sand), with some sites adding a thin decomposed rock layer, quickly reaching hard granite bedrock that dominates the profile.
Showing contractors within 60 miles of Wausau. 35 results found.













Check depths and logs of existing wells in the area before you drill.
Open well map →Costs, permits, maintenance tips for private wells in Wisconsin.
Open guide →A geological estimate for the Wausau area.
Analysis of a cross section of well logs throughout the greater Wausau region reveals a highly consistent geology. Most residential wells begin with a surface clay layer, ranging from 3 to 20 feet, sometimes mixing with sand or gravel and occasionally underlain by a thin decomposed or weathered rock interval. Below this, virtually all wells encounter fractured Precambrian granite to the full depth drilled (typically ~180–300+ feet, depending on yield and location, but sometimes deeper for high-capacity or low-yield sites). The static water level is usually 10–40 ft below ground, and productive residential wells commonly end in the granite at 180–260 ft, though site-specific yields can require deeper drilling.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 6 ft | Clay (with possible sand/gravel/cobbles) | Brown to gray clay, sometimes containing sand, gravel, or cobbles; upper glacial deposits; soft; can be locally mixed with silt or topsoil. | Color: Brown/Gray Hardness: Soft |
| 6 – 25 ft | Decomposed/weathered rock (where present) | Decomposed or weathered granite, locally soft rock, occasionally mixed with clay or sand; not always present or continuous. | Color: Gray/Yellowish Hardness: Soft to friable |
| 20 – 300 ft | Granite Bedrock | Competent, fractured Precambrian crystalline granite; highly variable fracture yield; potable water source for most completed wells. | Color: Pink to reddish-gray Hardness: Very hard |