Toxic blue-green algae found at Powys lake prompts warning for users

As a result Powys County Council is recommending that activities - especially where immersion in the water is likely - are restricted.

The algae, actually a type of bacteria called cyanobacteria, produces toxins which can cause skin rashes, nausea, vomiting, stomach pains, fever and headache if swallowed. 

Occasionally it can cause more serious illness such as adverse effects on the liver and nervous system.

The blue-green algae (cyanobacteria) occurs naturally in inland waters, estuaries and seas and cannot be removed or treated. It thrives in warm conditions and is likely to come and go throughout the summer season.

Given the potential health risks caused by blue-green algae people are advised not to swim in the water or to become immersed, e.g. stand-up paddle boarding, not to swallow the water, to avoid contact with the algae, not to eat fish caught in Llandrindod Lake, not to allow pets or livestock to come into contact with the water and to observe and abide by notices positioned around the lake.

Anyone who has come into contact with water containing blue-green algae should shower with fresh water immediately.

Anyone who has come into contact with affected water and has become ill should obtain medical attention.

For further help and advice please contact Powys County Council’s Countryside Access and Recreation Team on 01597 827500.

A Lakeside Boathouse spokesperson said: “We have made the decision to stop all paddle boarding and kayaking until further notice.

“We are still open and will allow canoes, dragon boats, rowing boats and a canoe raft. 

“We will continue to monitor the water as well as assisting the fishing club with oxygen monitoring et cetera. Levels are currently at an OK level and the aerators are on.

“Please keep all dogs away from the water’s edge as this can be fatal.”

Alderford Lake near Whitchurch is also currently closed because of blue-green algae.