M&A Profile

Industry-recognized technical leaders in water resources consulting for more than 30 years

About M&A

Montgomery & Associates (M&A) has a history of partnering with clients to address their evolving challenges. Our loyal base of clients includes municipalities, private water companies, government agencies, mining companies, industrial entities, and tribal groups who have come to expect state-of-the-art technical innovation combined with a strong, practical understanding of groundwater science. We employ a group of professionals in our U.S. and South American offices who specialize in hydrology, geology, soil science, policy and regulatory affairs, groundwater modeling, GIS analyses and 3D visualization, database management, and instrumentation and monitoring. Most of our principals have more than 20 years of experience; nearly all have master’s or doctoral degrees, along with one or more professional registrations. M&A staff members frequently present at conferences, participate in professional organizations, and serve on advisory boards.

Officially founded in 1984 by Dr. Errol “Monte” Montgomery, M&A’s roots date back to the 1960s. The company grew out of Monte’s long professional affiliation with Dr. John Harshbarger who founded the renowned Department of Hydrology & Water Resources at the University of Arizona in 1967. In 2018, M&A acquired HydroMetrics Water Resources Inc., an industry leader in California, which has allowed us to expand our ability to serve clients complying with California’s Sustainable Groundwater Management Act (SGMA) and solidify the core services we provide across the western United States and South America.


Our corporate office is located in Tucson, Arizona. Branch offices are located in Arizona, California, Colorado, Nevada, Utah, Argentina, Chile, and Perú.