Mantua Reservoir Recreational Monitoring 2021

Report a Bloom

24-Hour DEQ Environment Incidents Line: (801) 536-4123

Call Utah Poison Control Center

Poison Control (800) 222-1222

If you believe you or your pet have been exposed to a harmful algal bloom, call (800) 222-1222.

Update July 22, 2021 (HABs)

The Warning Advisory for Harmful Algal Blooms (HABs) at Mantua Reservoir remains in place.

On July 21st, the DWQ HABs monitoring team visited Mantua Reservoir. HABs were observed along the north shore. Cyanotoxin and cell density samples were collected and results are pending. As UDWQ and UDOH continue to visit and monitor waterbodies, updates will be posted.


Update July 12, 2021 (Waterborne Pathogens/HABs)

The Warning Advisory for Harmful Algal Blooms (HABs) at Mantua Reservoir remains in place.

On July 6th, the DWQ waterborne pathogens monitoring team and HABs monitoring team visited Mantua Reservoir. HABs were observed at the northeast boat ramp and along the north shore. Samples from near the boat ramp did not contain E. coli above recreational thresholds. Routine sampling for waterborne pathogens will continue monthly.


Update July 8, 2021 (HABs)

The Bear River Health Department has issued a Warning Advisory for Mantua Reservoir.

Samples taken from the reservoir on July 6th contained toxigenic cyanobacteria cell densities at 1,176,194 cells/mL, which is above the UDWQ/UDOH recommended Warning Advisory threshold of 100,000 cells/mL.

Keep yourself, your family, and your pets safe during a harmful algal bloom.

Mantua Algal Bloom

Mantua Reservoir, July 6, 2021
Click for a larger version.


Update June 11, 2021 (Waterborne Pathogens)

On June 1st, the DWQ waterborne pathogens monitoring team visited Mantua Reservoir. Samples from near the boat ramp did not contain E. coli above recreational thresholds. Routine sampling will continue monthly.


Update June 4, 2021 (HABs)

On June 1st, the DWQ HABs monitoring team visited Mantua Reservoir. The monitoring team did not observe a harmful algal bloom. Cyanotoxin and cell density samples were not collected. As UDWQ and UDOH continue to visit and monitor waterbodies, updates will be posted.