Suspected blue green-algae prompts safety warning at Surrey pond

It comes during a heatwave with temperatures of up to 38C

Author: Grace McGachy Published 22nd Jun 2026

Suspected blue-green algae has been found at Frensham Great Pond, prompting authorities to advise the public against swimming or entering the water.

Rangers discovered the potential algae presence and have notified the Environment Agency for further examination and verification.

This warning comes amid a heatwave in Surrey this week with temperatures which could soar to more than 38C as extreme heat warnings and health alerts have been issued across the UK.

Despite the heat, it is crucial to avoid the water as blue-green algae can pose a health risk to both humans and animals.

To ensure safety, it is also important to keep pets away from the pond.

The situation at Frensham Great Pond is being closely monitored to safeguard public welfare.

Visitors are asked for their cooperation during this period, with updates to be provided as soon as the pond is deemed safe for use again.

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