Gregg Drilling LLC

Gregg Drilling has more than 37 years experience with geotechnical and environmental site investigations. We are one of the largest site investigation providers in the Western U.S. offering a full suite of on-land and marine site investigation services including: drilling, cone penetration testing, sampling, remediation, and well services. In addition, our experienced personnel can maintain a high productivity rate saving time and money to the overall project.

Gregg is a diversified geotechnical and environmental drilling contractor. Originally founded in 1985, we currently have 150 employees and offices at the following locations: Signal Hill, CA (Corporate Office), Martinez, CA, and Palo Alto, CA.

Gregg’s clients include government agencies, industrial owners, engineering consulting firms and construction firms. Gregg is an Alaska Native-owned 8a-certified small business focused on quality and safety standards in site investigation.

Gregg has been widely recognized as a leader and innovator in subsurface investigation, providing clients in industry and government with excellent service, efficient performance, and a high standard of safety.

Gregg has set the standard among drilling companies through the pursuit of one simple goal: to provide clients with high-quality, innovative services performed in a safe, timely and cost-effective manner.