About Us

Established in 1991 as a small environmental drilling contractor with one rig, Connelly and Associates, Inc. now ranks as one of the largest geotechnical drilling firms in the Washington, D.C. and Baltimore, Maryland region.  We provide services of the highest level.  Our employees conduct themselves in a professional manner and enjoy their work. Our equipment is well maintained, dependable and constantly updated. Our clients regard us as partners in the process and not simply another subcontractor. We continue our success with a consistent focus on these ideals.

Our Mission

To continue a tradition of excellence by assertively optimizing operational best practices which initiates an enhanced employee working experience and provides added value to our clients.

Our Certifications

National Drilling Association – Participating Member
National Ground Water Association – Certified Contractor


Licensed Construction Firm
Licensed Master Well Driller

Licensed Class A Contractor
Certified Water Well Systems Provider

West Virginia
Licensed Drilling Contractor
Licensed Water Well Driller
Licensed Pump Installer

Licensed Water Well Contractor