According to our records, this business is located at 950 Howe Rd. in Martinez (in Contra Costa County), California 94553, the location GPS coordinates are: 38.003482 (latitude), -122.111462 (longitude). Gregg Drilling & Testing is categorized under Oil Field Contractors (SIC code 1381). Known organization vice president is Chris Christensen. Current estimates show that the unit has a sales volume of $9,900,000 and staff of approximately 55 people. You can contact the company by phone at (925) 313-5800; the following fax number is also provided: (925) 313-0302. Business website can be accessed at www.greggdrilling.com.