Cleath-Harris Geologists
Cleath-Harris Geologists is a geological consulting firm providing services in hydrogeology, engineering geology, environmental services, and mineral resources.
Last updated September 2, 2026
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Overview
Cleath-Harris Geologists has been providing geological consulting services for over thirty five years. The firm is dedicated to providing personalized service and building client relationships based on trust, integrity, and performance. Its team consists of professional geologists with certifications in hydrogeology and engineering geology.
History
Cleath-Harris Geologists has been providing geological consulting services for over thirty five years. The firm is led by Timothy S. Cleath, founder and vice president, and Spencer J. Harris, president. Tim Cleath is a certified hydrogeologist and certified engineering geologist in California, with over 35 years of experience. Spencer Harris is also a certified hydrogeologist and certified engineering geologist, with over 25 years of experience managing water resource projects.
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