Gunlock Reservoir is located approximately 15 miles northwest of St. George. 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 June 2, 2025: Waterborne pathogen (E. coli) monitoring update GOOD NEWS: E. coli counts were measured below…