City Considers Options for Treating Algae

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City Considers Options for Treating Algae

The City of Anacortes is moving forward with plans to treat algae blooms in Heart Lake, aiming to start sometime in early spring.

While lake samples did not test positive for toxic blue-green algae last fall, the city is taking precautions and going ahead with treatment, said Forest Lands Manager Jonn Lunsford.

Toxic algae can harm both lake organisms and people. It was last identified in Heart Lake in 2013, he said.

This summer, the city used an aquatic herbicide to treat the lake for milfoil, an invasive plant that gets tangled up with boat motors and swimmers. The treatment is likely what led to the algae bloom, Lunsford said.

The city’s plan is to treat the lake with aluminum sulfate, which deprives the algae of a key food source, phosphorous.

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Uncertain Environmental Consequences of Herbicide Use - Florida water managers spray upward of $15 million worth of herbicides annually to keep the invasive plant in check on public lands — with uncertain environmental consequences.

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