WA 253-604-4878
OR 360-718-9410

Geotechnical Drilling Services

Geotechnical site investigations are used to determine existing ground conditions, underlying geology, and hydrology. We use a wide range of drilling, soil sampling, and in-situ sampling techniques to provide data for engineering and design. This data can then be used to determine the type and use of preventative measures to mitigate possible settlement, soil movement, or the presence of groundwater that may adversely impact existing or proposed structures.

Your team at Holt Services Inc utilizes state-of-the art equipment and instruments to conduct your geotechnical testing with accuracy and to exacting standards.

Geotechnical Drilling

Instrumentation installation


The Newest, Largest, Most Diverse Fleet of Drilling Rigs for Your Geotechnical Drilling Project

Whether your project is simple or complex, the experienced, knowledgeable drillers at Holt Services are equipped to complete your geotechnical drilling project to exacting standards. Get the equipment, quality, and rigorous safety standards of a large company and the friendly, personalized service of a family-owned business.

Contact us today to talk with a geotechnical drilling professional and get a quote. Standard quotes are typically provided within 24 hours, often the same day.

"Awesome job with the sonic rig in downtown Bellevue!!! I am truly amazed!!! A big THANK YOU to the crew!!"


Washington HQ
10621 Todd Rd. E, Edgewood, WA 98372

Oregon Office

12305 NE 56th St, Vancouver, WA 98682

Washington CL #HOLTSSI898JG
Oregon Construction Contractors Board #198764
Idaho Public Works CL #015401-CC-4
Montana CL #MWC449
Alaska CL #39039
California Type C-57, #1008224
New Mexico CL #5205166
Utah Water Well Driller License #909

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