1. a Department of Civil, Construction and Environmental Engineering, North Carolina State University (NC State), 915 Partners Way, Raleigh, NC 27606, USA
2. b Center for Human Health and the Environment, NC State, Raleigh, NC, USA
3. c Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA
4. d Division of Public Health, North Carolina Department of Health and Human Services, Raleigh, NC, USA
5. e Raleigh Water, Raleigh, NC, USA