RGH Consultants was founded in 1991 as a full service firm with expertise in geotechnical engineering, engineering geology, and construction observation and testing. RGH has grown to become one of the largest locally owned geotechnical engineering firms in the northern Bay Area. Headquartered in Santa Rosa, California, RGH has satellite offices in Napa and Middletown, California. Our staff of professional engineers and geologists, field engineers and engineering technicians collectively have decades of experience in geotechnical engineering, engineering geology, construction observation, and materials testing in northern California. In addition to our experience in northern California, our staff has performed engineering and geological services on projects throughout the United States and in other countries and territories.