# Blue-green algae blooms in UK and US

> Live situation record from CLSTR: https://clstr.news/situations/blue-green-algae-blooms-in-uk-and-us
> Updated: 2026-08-09T14:11:45.000Z. Sources: 2. Developments: 2.

Toxic blue-green algae blooms have triggered health warnings and closures in both the United Kingdom and the United States.

In the UK, authorities in the Shetland Islands issued warnings and banned swimming at certain coastal locations and Spiggie Loch due to high concentrations of cyanobacteria. Officials noted that while water supplies were unaffected, the toxins pose risks of skin irritation, nausea, and potential fatalities in pets.

In the US, officials in Stoughton reported suspected algae blooms following the death of a dog after swimming in Ames Pond. Health officials have urged residents to keep pets away from the water as these blooms can develop rapidly.

## Timeline

### 2026-08-09: Algae blooms cause wildlife deaths and health warnings in US and UK

Toxic blue-green algae blooms are causing wildlife deaths and posing risks to pets and humans in the US and UK.

2 sources. https://clstr.news/cluster/algae-blooms-cause-wildlife-deaths-and-health-warnings-in-us-and-uk

### 2026-07-29: Blue-green algae blooms prompt beach closures and warnings in UK waters

Health officials have closed two beaches over blue‑green algae risks, and Shetland Council warned of a bloom in Spiggie Loch, citing potential toxin exposure and ongoing monitoring.

8 sources. https://clstr.news/cluster/blue-green-algae-blooms-prompt-beach-closures-and-warnings-in-uk-waters

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Cite as: Blue-green algae blooms in UK and US. CLSTR, https://clstr.news/situations/blue-green-algae-blooms-in-uk-and-us