(Francisco Kjolseth | The Salt Lake Tribune) Elliott Purser, center, and Cody Hook with Sandy City load up cases of water into the trunk of a resident at the Sandy Operations Center at 9150 South, 150 East on Sunday, Feb. 17, 2019. The city says the problem with its water supply started about Feb. 6, when a fluoride pump malfunctioned because of a power outage. It flooded the water system with fluoride and that also led to high levels of lead and copper, enough that it made some people sick.