# Global toxic algae bloom occurrences

> Live situation record from CLSTR: https://clstr.news/situations/global-toxic-algae-bloom-occurrences
> Updated: 2026-08-18T12:47:17.000Z. Sources: 4. Developments: 2.

Toxic algae blooms have been reported in various regions, prompting health and safety warnings for humans and animals.

In Minnesota, hot summer weather and high phosphorus levels from runoff have caused thick green algae blooms in lakes. The Minnesota Pollution Control Agency warned that these blooms can cause symptoms like rashes, diarrhea, and vomiting in humans, and pose a lethal risk to pets, including liver failure and death.

Similar warnings have been issued in Canada and the United Kingdom. In Canada, blue-green algae was confirmed in Hattie Cove within Pukaskwa National Park, leading authorities to advise against swimming or using the water for household purposes. In the United Kingdom, the Environment Agency confirmed toxic blue-green algae in the River Thames near a designated bathing area in Kingston, advising swimmers and pet owners to avoid the water.

## Timeline

### 2026-08-18: Toxic blue-green algae detected in Canada and the UK

Toxic blue-green algae blooms have been confirmed in Hattie Cove, Canada, and the River Thames, UK, prompting health warnings for swimmers and pet owners.

4 sources. https://clstr.news/cluster/toxic-blue-green-algae-detected-in-canada-and-the-uk

### 2026-07-31: Toxic Algae Blooms Threaten Minnesota Lakes and Pets

Minnesota's warm summer fuels toxic algae blooms in lakes, risking human irritation and deadly pet poisonings; officials urge avoidance and prompt veterinary care.

2 sources. https://clstr.news/cluster/toxic-algae-blooms-threaten-minnesota-lakes-and-pets

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Cite as: Global toxic algae bloom occurrences. CLSTR, https://clstr.news/situations/global-toxic-algae-bloom-occurrences