Welcome to Hier Drilling Company Castle Rock, Colorado Hier Drilling is owned by George Hier and daily operations are managed by George, his son Bruce and daughter Robbie Person. They have continued for three generations since the founding of the company in 1944 by Archie Hier. The office is in Castle Rock, Colorado, and is centrally positioned in the business’ basic operational territory covering the counties of Douglas, Elbert, Arapahoe, El Paso, Adams and Jefferson. Contact us today with questions or for an estimate.     Over 60 years of experience! Copyright © 2006 by Hier Drilling Company. All rights reserved.