From the Englewood Herald (Tom Munds):
Utilities Director Stu Fonda said the project to include UV disinfection in the water treatment process is necessary in order to comply with newly enacted federal water purification standards. “The new standards require all water treatment plants have UV systems in place to eliminate the cryptosporidium in the water by 2013 ,” Fonda said. “Our current system meet federal standards for cryptosporidium and frankly, if it wasn’t for the new regulations, we probably wouldn’t be adding the UV to our system.” He did say the UV system might make a slight improvement in water taste and odor because the ultraviolet light reduces the amount of chemical disinfectant used in the water.
More water treatment coverage here.