During the warmer months lakes, rivers and coastal bays can be affected by blooms of algae. Most of these blooms are harmless even if we can see them, but some can be toxic.
Blooms may develop rapidly. When they decompose they may cause a bad smell and affect other lifeforms in the water. Some blooms can be harmful to humans and animals, such as dogs, especially when they break down.
It is best to avoid contact with the water if:
If you feel unwell as a result of contact with algal bloom, you should contact your doctor, or call Healthline on 0800 611 116.
Last updated 19.12.2023