This utility story video focuses on Milwaukee Water Works (MWW), a WRF subscriber for over 25 years and participating utility on over 25 WRF projects during that time. In 1993, MWW experienced a Cryptosporidium event, which resulted in a boil water advisory. Over the next five years, Milwaukee implemented an unprecedented $89 million renovation of facilities to strengthen the barriers related to source water protection, disinfection, and filtration. At the time, the $51 million design-build project was the largest ozone retrofit in the world. To ensure the success of this project, MWW relied on WRF research on ozone inactivation of emerging pathogens, ozone contactor optimization, bromate formation reduction strategies, quenching agents, and diffuser design.