Grand Lake Halifax

After eliminating other possible contaminants, the provincial government has concluded that a blue-green algae bloom is the cause of toxins in the water at Grand Lake, near Halifax.

Elizabeth Kennedy, the provincial director of the water branch, says final test results came back Wednesday that eliminated dozens of petroleum products, as well as pesticides, as the source.

Testing has confirmed the presence of blue-green algae consistent with levels dangerous to dogs, according to media release from the province. Pesticides and other contaminants were below detectable levels, the release said.

Kennedy said there's no way to treat the bloom.

a person standing in front of a fence: Elizabeth Kennedy says it's likely the lake will see more blooms, especially following hot weather. © CBC Elizabeth Kennedy says it's likely the lake will see more blooms, especially following hot weather.

"Once that's in the lake, we can't ever guarantee that it's safe from those risks," she said. "People would have to consider what water they're going to be drinking."

The toxins were first detected a week ago after two dogs died and a person was sent to hospital.

Kennedy says it's likely the lake will see more blooms, especially following hot weather.

"Across Nova Scotia, we're seeing blue–green algae …  more frequently," she said. "With climate change, we anticipate that this is going to be a growing concern."


Video: Province confirms toxins from blue-green algae contaminated Grand Lake (Global News)

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