PRE-PRINT DRAFT: Luh, J.; Baum, R.; Bartram, J. Int. J. Hyg. Environ. Health. http://dx.doi.org/10.1016/j.ijheh.2012.12.007 Equity in water and sanitation: developing an index to measure progressive realization of 1 the human right 2 3 Jeanne Luh, Rachel Baum, and Jamie Bartram* 4 5 The Water Institute, Department of Environmental Sciences and Engineering, Gillings School of 6 Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, CB#7431, 7 Chapel Hill, NC 27599, USA 8 9 * Corresponding author phone: +1-919-966-3934; fax: +1-919-966-7911; e-mail: 10 jbartram@email.unc.edu 11 12