Mona Reservoir is located in Mona City at the north end of Juab Valley (Juab County). DEQ’s recreational water quality monitoring checks for two health concerns: Harmful Algal Blooms (HABs) and Waterborne Pathogens (E. coli). Find the most recent monitoring information below. Updates: July 8, 2025: Waterborne pathogen (E. coli) monitoring update GOOD NEWS: E.…