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The local Medical Officer of Health has issued a health advisory for Lake Rotoehu. 

Recent sampling results confirm that there is a level of algal bloom activity in this lake.  The laboratory results show that the cyanobacteria present in these lakes are below health warning levels.  However, some of the species of algae which have been found in the lakes do produce toxins which can be harmful to people and animals, especially dogs. Therefore lake users should do their own assessment of risk based on the colour of the water, whether there’s suspended material in it, any scum on the surface, and any associated odour.  If any of these is present people should stay out of the water.

Check the Toi Te Ora health warnings page for further information or the Lake Rotoehu Kennedy Bay and Ōtautū Bay site details for sampling history.