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Stewart Brothers is involved in drilling campaigns at some of the most technically advanced facilities in the world. We have worked for Department of Defense installations, Department of Energy Laboratories, Transuranic waste facilities, EPA Superfund sites, and other facilities throughout the western US.  Whether it’s split-spoon sampling, geotechnical samples or installing injection/extraction wells, Stewart Brothers Drilling Company has the environmental and geotechnical experience you need. 


Stewart Brothers Drilling Company supports most environmental and geotechnical drilling projects with our all-terrain, CME 750 Hollow Stem Auger rig. This rig and crew are capable of drilling in a variety of auger sizes. It also supports an auto-hammer system for Standard Penetration Testing (SPT) sampling services. We utilize heavier drilling equipment to install deep observation wells, conventional coring for soil sampling, and discrete water sampling. 

Environmental Drilling Services:

  • Monitoring Wells
  • Injection/Extraction Wells
  • Environmental & Geotechnical Sampling
  • Standard Penetration Testing (SPT)
  • Piezometer Installation
  • Split Spoon Sampling
  • Air Rotary Well drilling


  • Continuous Coring (4 inch)
  • Auto Hammers
  • Large Diameter Augers
  • Soil Vapor Extraction Wells
  • Cathodic Protection/ Anode bed wells
  • Air Sparge Wells
  • Shelby Tube Sampling

Our technically experienced drilling crew is properly trained for the safety and health concerns of DOE, DOD, MSHA or other similarly restricted sites. Whatever your need, we’d be happy to discuss the options available to meet it.