The Ottawa District Office of the Ministry of the Environment, Conservation and Parks (MECP) received a report regarding a possible harmful algal bloom.

That possible HAB was observed at 11:34 AM on Friday, October 3, 2025, at 155 McCreary’s Beach Road, (McCreary’s Beach Resort), Drummond-North Elmsley Township, at a pond, adjacent to Mississippi Lake. 

Based on conversations with the Leeds/Lanark/Grenville Health Unit, a site visit will not be conducted. There are no public beaches, recreational camps, or small drinking water systems that draw drinking water from the lake.

Another possible HAB was observed at 3:25 PM on Saturday, October 4, 2025, on Charlie Drive in Drummond-North Elmsley Township, at Ebbs Bay, Mississippi Lake.

Based on conversations with the Southeast Health Unit, a site visit will not be conducted.

For general information on blue-green algae, please refer to the MECP’s website at Blue-green algae | ontario.ca.