Porcupine Reservoir is located approximately 4 miles east of Avon in Cache 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 Porcupine Reservoir monitoring information below. Updates: October 31, 2023: Waterborne pathogen (E. coli)  monitoring update Recreational monitoring has ended…