My soils are sand/sandy loam/a bit of clay/and more sand, so drilling is easy.
When I lived in So. Cal. I talked to a well driller that said he had to go thru 100's of feet of rock to drill a well. Back in the late 1980's they were charging $20/foot. That could run into some serious money quickly. One well that I know of was over 500' down.
