Ahrens joined the San Antonio Water System in 2004 and currently serves as the Vice President of Water Resources and Conservation. Ahrens is responsible for the development of a high quality, diversified water supply for a community of more than 1.3 million people in Bexar County. Ahrens leads the areas of water conservation, drought management, water rights acquisitions, and water supply project development and he interacts with numerous public officials at all levels of government. Ahrens received his undergraduate degree from Texas State University in Geography – Urban and Regional Planning.