A major bummer for campers this long weekend at Wildwood Conservation Area.

The Perth District Health Unit and Southwestern Public Health say you must avoid swimming in the reservoir because of a toxic blue/green algae bloom.

Exposure could cause skin irritation and flu like symptoms, or worse.

The public is being told to avoid all contact with the water, same goes for your pets. And any fish caught are not to be eaten.

The Upper Thames River Conservation Authority and the local health units will continue to monitor the situation.