Never swim or take part in any activity that may result in accidental consumption or exposure to water affected by algal blooms if a health warning is in place for that area, even if there are no visible signs of a bloom.  Do not let stock or dogs swim or drink from the water.

If a health warning is in place, it means that cyanobacteria (blue-green algae) are present in large numbers in that bay/lake. Cyanobacteria are capable of producing toxins that are harmful to humans and animals if swallowed or if exposed to skin (such as may occur when swimming, skiing or kayaking etc).

If no health warning is in place you should still assess the situation carefully before entering the water. If the water is cloudy, discoloured, or has small globules suspended in it, it is better to be cautious and totally avoid that lake or bay. Wind blowing onto shore may concentrate a bloom in a bay and make it unsafe for recreational contact. This can occur at any time of the year, but is more common in warmer summer months. Even if the water appears completely normal to the naked eye, it can still have large numbers of algae present.  

If you experience health symptoms that come on within minutes of contact with the water, you should avoid further contact with the water and, if symptoms persist, contact Community and Public Health 03 379 9480 or see your doctor.

For further assistance please contact Customer Service on 03 353 9007 or toll free on 0800 324 636.