Scientists have confirmed the presence of a harmful algal bloom on Mirror Lake. This is the second bloom to be reported in the lake since 2020. According to the Adirondack Daily Enterprise, experts say both people and their pets should avoid contact with the water of Mirror Lake. Harmful algal blooms — or HABs — can contain toxins that can make people, pets and wildlife sick. While Wiltse said the AWI isn’t sure if the HAB on Mirror Lake contains toxins, he said people should keep away from the water for at least the next several days.