
Faherty & Son Well Drilling LLC
Platteville, WI53818
Typical Platteville area wells penetrate clay, Galena limestone, Upper Platteville dolomite, Trenton (McGregor) limestone, and St. Peter sandstone, sometimes reaching deeper into shale or lower dolomite units.
Showing contractors within 60 miles of Platteville. 22 results found.















A geological estimate for the Platteville area.
Typical Well Depth
Static Water Level
Recommended Method
Representative Platteville regional wells begin with a shallow clay layer, grading into Galena limestone, then Upper Platteville dolomite. This is followed by the Trenton (McGregor) limestone and a thick St. Peter sandstone aquifer. A minority of deeper wells encounter a basal shale (Readstown), and/or lower dolomite (Prairie du Chien) beneath the St. Peter. The majority of residential wells target the Trenton or the upper to mid St. Peter sandstone for reliable yields (5-30 GPM). Most bedrock wells are constructed to between 180 and 260 feet; high-capacity or deeper exploratory wells may extend to 330+ feet.
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 10 ft | C | CLAY (surface clay, reddish brown to grey possible) | Hardness: Soft |
| 10 – 70 ft | L | GALENA LIMESTONE (slightly dolomitic, fossiliferous, medium hard) | Hardness: Medium-Hard |
| 70 – 110 ft | L | UPPER PLATTEVILLE DOLOMITE (fine to medium crystalline, interbedded, hard) | Hardness: Hard |
| 110 – 160 ft | L | TRENTON (MCGREGOR) LIMESTONE (sometimes includes shaley partings around 140-145 ft) | Hardness: Medium |
| 160 – 210 ft | N | ST. PETER SANDSTONE (well cemented, coarse to fine, primary aquifer) | Color: Light brown/tan Hardness: Soft to Medium |
| 210 – 282 ft | N | ST. PETER SANDSTONE (continued, common target for high yield, upper part often more permeable) | Color: Light brown/tan Hardness: Soft |
| 282 – 295 ft | H | READSTOWN OR OTHER SHALE (only in deepest wells, thin, not always penetrated) | Color: Dark gray/green Hardness: Soft |
| 295 – 333 ft | L | LOWER MAGNESIUM PRAIRIE DU CHIEN (dolomitic limestone; infrequent/local) | Hardness: Hard |