A health warning has been issued for Lake Ohakuri after potentially toxic blue-green algae was found.
Routine monitoring results provided by the Waikato Regional Council have confirmed the finding.
Tingling around the mouth, headaches, breathing difficulties and visual problems are only some of the possible effects of the toxin transfered through water. Contact with water affected by blooms of blue-green algae can cause asthma and hayfever attacks in some individuals.
It could also cause skin rashes, stomach upsets, and in some cases neurological effects such as tingling around the mouth, headaches, breathing difficulties and visual problems.