Connelly and Associates, Inc.

Connelly and Associates, Inc. Geotechnical, Environmental, Water Well & Geothermal Drilling - Founded in 1991 and Baltimore, Maryland region, operating in five states.

Established in 1991 as a small environmental drilling contractor with one rig, Connelly and Associates, Inc. now ranks as one of the largest geotechnical, environmental, and well drilling firms in the Washington, D.C. Based out of Frederick, Maryland and Manassas, Virginia, we send experienced drill crews to perform drilling services for water wells, geothermal wells, monitoring wells, soil and ro

ck core borings, geotechnical instrumentation, or supply other services in support of engineering and environmental consultants. We are experienced and certified to install well pumps, pressure systems, and complete geothermal ground loop connection including flushing and filling the system. From track to large truck and ATV-mounted drill rigs, we have the equipment and crews at the ready to complete your drilling project safely and on time. Our drillers are licensed, OSHA trained professionals with experience in all types of borehole advancement, including air and mud rotary, wash borings, hollow stem augering and diamond core drilling.

07/15/2026

Thank you to Connelly and Associates, Inc. for being a Hole Sponsor for the Golf Classic! ⛳️

07/02/2026
We’re excited to welcome Mark Fisher, CSP to our team! With more than twenty years of experience leading safety programs...
05/22/2026

We’re excited to welcome Mark Fisher, CSP to our team! With more than twenty years of experience leading safety programs on major construction and infrastructure projects, Mark brings practical expertise, strong leadership, and a steadfast commitment to protecting our people and supporting our clients.

Address

1513 Tilco Drive
Frederick, MD
21704

Opening Hours

Monday 6am - 5pm
Tuesday 6am - 5pm
Wednesday 6am - 5pm
Thursday 6am - 5pm
Friday 6am - 5pm

Telephone

+13016968820

Website

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