Mark Walker became a member of the faculty of the Environmental and Resource Sciences Department at the University of Nevada - Reno in September, 1997. Prior to this, he was a hydrologist with the New York State Water Resources Institute at Cornell University.

His research interests include assessing the health risks posed by nonpoint sources, such as Cryptosporidium and Leptospira. He is exploring ways to develop risk assessment tools, including methods to determine presence of pathogens in environmental samples. As State Extension Water Specialist, Mark is working with county and regional faculty to identify priorities and opportunities for Extension involvement in community water resources issues.  This includes developing and carrying out training programs for rural water suppliers in Nevada using videoconferencing facilities. Part of his current effort is devoted to assessing exposure to elevated concentrations of arsenic in private drinking water wells in Churchill County.  With support provided by the U.S. Department of Agriculture’s Cooperative State Research Education and Extension Service and Senator Harry Reid's office, he is evaluating exposure to arsenic through private wells and examining seasonal trends in arsenic concentration that might be associated with application of irrigation water.

For a recent presentation exploring the links between occurrence of leptospirosis and watershed development, click here.

For a recent presentation about the influences of canine waste accumulation on surface water quality, click here.