While the addition of chlorine is one of the safest and most effective means for water disinfection, under certain circumstances chlorine in combination with naturally occurring organic compounds in water can lead to the formation of undesirable disinfection- byproducts (DBPs). One of the most common DBPs is a family of volatile compounds called trihalomethanes (THMs) which are regulated in the United States (U.S.) to a level of 80 ppb (parts per billion) by the U.S. Environmental Protection Agency. As water age increases (the time from water treatment in a plant to ultimate use), THM formation progresses with water utility operators closely monitoring their system’s locational running annual average (LRAA) for THMs.