Well Drillers Near Holly, Michigan

A geological estimate for the Holly area.

Detailed Summary

Regional subsurface geology in Holly, MI is dominated by a sequence of surface sand (with or without some silt), underlain by alternating brown/gray clays and occasional thin sand layers. The most prominent aquifer is a medium-to-coarse sand and gravel unit (34–35 ft thick), typically encountered from 53 ft to 87–90 ft. Above this aquifer, the clay/silt layers have cumulative thicknesses of 40–50 ft, often split into brown (nearer surface) and gray subunits. Shallower sand layers (e.g., at 7–8 ft) are thin and generally unsaturated. Deeper consolidated formations (e.g., shale, sandstone) reported in some regional logs are not present within the common drilling depth in Holly. The typical residential well for 10–20+ GPM production is set in the basal sand/gravel; static water levels average 30–50 ft. Modern wells use rotary mud drilling, PVC casing 5" to 77 ft, and bentonite grout from grade to casing base.

Expected Geological Layers