Business Details
35 Years
experience
Trusted Geotechnical & Environmental Drilling Services
Established in 1991, Connelly & Associates has grown from a small environmental drilling contractor with one rig to one of the largest geotechnical drilling firms in the Washington, D.C. and Baltimore region. Our team operates one of the most advanced and diverse drilling fleets in the Mid-Atlantic, serving both urban and remote environments. We specialize in sonic drilling, geotechnical and environmental drilling, limited access projects, and water well and geothermal drilling. Our employees maintain professional conduct while utilizing well-maintained, state-of-the-art equipment to deliver accurate results.Clients regard us as trusted partners rather than subcontractors, valuing our commitment to safety, compliance with OSHA and EPA standards, and decades of technical expertise. Our mission emphasizes operational excellence that enhances employee experience and client value. Leadership includes President Samuel A. Connelly, who brings over 25 years of drilling experience, and Vice Presidents Eamon Connelly and Emily Sottile, who oversee financial and personnel operations respectively.
Services
Sonic Drilling
Geotechnical Drilling
Environmental Drilling
Limited Access Drilling
Water Well Drilling
Geothermal Drilling
Mud Rotary Drilling
Air Rotary Drilling
Direct Push Drilling
Details
- Year established: 1991
Highlights and features
- 30+ years of specialized drilling experience in the Mid-Atlantic region
- Modern fleet with advanced sonic and geotechnical drilling equipment
- Strict compliance with OSHA, EPA, and state safety standards
- Certified crews handling complex projects in challenging environments
- Proven track record with major infrastructure and renewable energy projects
What people say
Quality service
Best equipment
Dependable crews
Unparalleled knowledge
Professionalism
Services
Sonic Drilling
Utilizing sonic energy for clean, efficient drilling in unconsolidated formations. Enables accurate sampling without borehole collapse. Ideal for environmental and geotechnical investigations requiring undisturbed samples.
Geotechnical Drilling
Provides subsurface soil data through standard penetration testing and borehole sampling. Critical for foundation planning and engineering analysis. Delivers precise information about subsurface conditions for construction projects.
Environmental Drilling
Installs monitoring wells and vapor intrusion systems. Creates safe boreholes for contamination assessment. Supports remediation efforts with accurate environmental sampling and data collection.
Limited Access Drilling
Delivers drilling solutions for restricted or hard-to-reach locations. Utilizes specialized equipment to access challenging sites while maintaining precision and safety standards during operations.
Geothermal Drilling
Constructs drilling systems for geothermal loop installations. Supports sustainable energy solutions with precise borehole creation. Ensures efficient heat exchange system performance for residential and commercial applications.
People
Samuel A. Connelly
President
Over 25 years of drilling experience. Leads daily operations and client relations. Holds a Master Water Well license. Serves as President since 2020 after 14 years in management roles.
Eamon Connelly
Vice President
Manages financial operations and risk control. Holds MBA in accounting. Graduated from Towson University and Hood College. Ensures fiscal responsibility and strategic financial planning.
Emily Sottile
Vice President
Oversees personnel and organizational development. Joined in 2005 with human resources expertise. Graduate of The Evergreen State College. Focuses on employee relations and company culture.
Questions
What geographic areas do you serve?
We primarily serve the Mid-Atlantic region including Maryland, Virginia, West Virginia, and Washington, D.C. Our fleet supports projects in both urban and remote locations.
What types of drilling services do you offer?
We provide sonic drilling, geotechnical drilling, environmental drilling, limited access drilling, and water well/geothermal drilling services using advanced equipment tailored to project requirements.
Are you available for emergency projects?
While we prioritize scheduled work, we assess urgent requests case-by-case. Our modern fleet allows rapid mobilization for critical stabilization or drilling needs.
What safety certifications do your crews hold?
Our teams maintain strict compliance with OSHA and EPA standards. All operations follow rigorous safety protocols with regular training to ensure regulatory adherence and field safety.
How do you handle complex drilling challenges?
We deploy specialized equipment like sonic rigs and direct push technology. Our crews have proven experience with technically demanding projects including bridge replacements and renewable energy infrastructure.
Can you handle both environmental and construction drilling needs?
Yes, we provide integrated services for environmental assessments and construction foundations. Our capabilities span monitoring well installation, rock coring, and subsurface exploration for diverse projects.
Reviews (4)
Stephen
Sep 19, 2025
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We continue to use Connelly because of their reliability and quality. They have the fleet and staff to be able to cover our wide range of projects. When we work with Connelly, we know we are getting quality drilling with data we can rely on.
Michael White
Dec 07, 2020
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Critical: Professionalism Very rude - aggressive drivers - I would be cautious working with this company- not very professional
Jessica Kiser
Jun 11, 2020
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Like another reviewer, I am writing this review about the reckless behavior of one of their trucks this morning on 495. They cut me off without signal as I was in an adjacent lane behind their truck, forcing me to slam on my brakes and swerve violently into the next lane of traffic to avoid hitting them. They continued to do this to other drivers along the same route. If the company would like to contact me, I can give you the time of incident and US DOT number for the truck. I would not use this company for their lack of respect for safety and others.
Tom Connelly
Oct 06, 2018
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Geothermal installation and water well drilling on adjacent lot. All work completed within budget and time constraints. Site restored to original configuration and reseeded.
