Newton Reservoir is located off Route 142 west of Trenton in Cache County. DEQ’s recreational water quality monitoring checks for Harmful Algal Blooms (HABs). Find the most recent Newton Reservoir monitoring information below.
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Updates
November 1, 2025: Recreational water quality monitoring update
Recreational water quality monitoring has ended for the season. Monitoring will resume in June or July 2026. Harmful algal blooms can occur year-round, so know what to look for and always check before recreating.
July 29, 2025: Harmful algal bloom (HAB) monitoring update
GOOD NEWS: Our monitoring team did not see any visible signs of a harmful algal bloom. Learn more about harmful algal blooms.
Site visited: Southeast side near boat ramp
June 25, 2025: Waterborne pathogen (E. coli) and HAB monitoring update
GOOD NEWS: E. coli counts were measured below recreational thresholds and our monitoring team did not see any visible signs of a harmful algal bloom.
Site sampled: Southeast side near boat ramp