The rollover took place on a rural property at roughly 10:50 p.m. on July 4, according to Wakaw RCMP.
Police said three occupants were riding in the side-by-side ATV when the driver lost control and rolled it. None of them were wearing a helmet, according to a press release.
EMS pronounced a 51-year-old passenger dead at the scene. His name was not released by police.
Both the driver, a 48-year-old man, and the other passenger were not hurt, RCMP said.
Officers arrested Patrick Strong on scene and he has been charged with impaired operation of a motor vehicle causing death as well as refusing to provide a breath sample. The Saskatoon man is expected to make his first provincial court appearance on Aug. 11.