The Department of Environmental Quality proposed to amend Utah Admin. Code r. 309-110-4, Drinking Water. Changes would add definitions for ultraviolet light disinfection terminology in support of the disinfection rule update and define "detectable residual" for other disinfectants. The deadline for comments is December 31, 2010, and the rule may become effective on January 7, 2011. http://www.rules.utah.gov/publicat/bull_pdf/2010/b20101201.pdf pp. 34-48.