GRCA warns of blue-green algae bloom at Conestogo Lake

The Grand River Conservation Authority is warning Conestogo Lake users not to swim in the lake because of a blue-green algae bloom.

According to a release, on MondaytheGRCAtook samples of the algae bloom for analysis and foundthe algae contains a toxin called microcystin which can make people or animals sick if they ingest it. When the algae dies, that toxin is released into the water.

After about five to seven days, the toxin breaks down.

Signs warning of the bloom are posted at the park gatehouse and beach, and the GRCA is also notifying cottage owners around the lake.

The GRCA also says:

• Don't swim in the reservoir
• Keep children and pets away from the algae
• Avoid contact with the algae
• Don't eat fish from the lake
• Don't use the water for drinking or any other purpose
• Boating is allowed, but boaters should avoid touching the algae.

There have been no report of illness because of the algae. The Ontario government has more information on blue-green algae here.