TL;DR
Parowan's deep valley-fill aquifer makes for efficient drilling, with most domestic wells at 200 to 400 feet. Like the rest of Iron County, the basin is tightly managed — plan on a change application on an existing water right, especially for irrigation wells.
Summary
From historic downtown to the Parowan Valley farms, here is what to expect when drilling a well in Iron County's mother town — depths, costs, water rights, and irrigation wells.