IT is safe to go back into the water at Llyn Clywedog after it was confirmed that levels of a dangerous algae had subsided.

People and pets had been urged to stay out of the Powys reservoir’s water since November after high levels of blue-green algae were recorded.

This led to a restriction of activities at the reservoir, especially where immersion in the water was likely.

The algae produce 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.

But this week, it was confirmed that levels of the algae have now subsided below the warning threshold.

Regular monitoring by Natural Resources Wales has taken place at Llyn Clywedog Reservoir since the algae was identified. The last two consecutive weekly samples taken from the reservoir are below the warning threshold.

Natural Resources Wales have advised site owners Hafren Dyfrdwy that the blue-green algae bloom has subsided.

Hafren Dyfrdwy have informed those who operate on the water (sailing, water sports and fishing), and the adjacent landowners and visitors that that the algal levels have now dropped.

The build-up of blue-green algae at Llyn Clywedog reservoir is a natural occurrence which occurs from time to time during warm conditions. It is always possible that a blue-green algae bloom may return.