William E. Motzer

Senior Geochemist

Photo of William


Dr. Motzer has over 34 years of experience as a Professional Geologist and more than 26 years of experience in conducting surface, subsurface, and environmental forensic investigations. He is a recognized expert in water quality and forensic geochemistry, with particular expertise in stable and other isotopic "fingerprinting," age dating techniques, and water quality/contaminant geochemistry, particularly with regard to NDMA, pharmaceuticals, perchlorate, hexavalent chromium, arsenic, lead, mercury, and nitrate.

Bill has been responsible for the management of environmental audits, site assessments, and investigations on more than 400 projects throughout California and other western states for attorneys, private corporations, water districts, municipalities, and state agencies. In addition, he has 10 years' experience as a minerals/mining exploration geologist, specializing in base and precious metal deposits, and has been retained as an expert witness for mine litigation issues. He has contributed to several book chapters and is the author of numerous journal articles.

Bill has contributed significant time and energy to several professional organizations, including GRA, where he served as San Francisco Bay Branch President in 2007 and 2008. He regularly contributes articles to the GRA's publication HydroVisons, and is past co-chair of the Technical Committee. He is a past Board Councilor and Vice President for the SEGH (2008-2012), Northern California Section Chair (2010-2012) for SME, and is a contributing editor for the California Section of ACS newsletter, The Vortex. The Vortex.

Academic Background and Professional Credentials:

Professional Geologist California, No. 4202
Certified Hydrogeologist California, No. 952
Professional Geologist Alaska, No. 459
Registered Geologist Arizona, No. 25354
Professional Geologist Idaho, No. 453
Professional Geologist Illinois, No. 196-000101
Registered Geologist Oregon, G1353
Registered Geologist Washington, No. 1867
Registered Professional Geologist American Institute of Professional Geologists, CPG-8635

Ph.D., Geology, University of Idaho, 1986
M.S., Geology, University of Idaho, 1978
B.S., Geology, University of Idaho, 1969