There are health warnings in place for Lake Rotoehu and the Rangitaiki River upstream from Aniwhenua because of blue green algal blooms.
This cyanobacteria is 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. The blooms are a result of poor water quality and warm weather.

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All other Rotorua lakes currently remain safe for swimming.
He says people should look on Environment Bay of Plenty's website for the latest water quality monitoring and lake health warnings: www.envbop.govt.nz
Residents and visitors are also advised to look out for warning signs and check the latest Toi Te Ora – Public Health advisories on www.toiteorapublichealth.govt.nz
Throughout summer Environment BOP carries out weekly blue green algae monitoring for lakes Rotorua, Rotoiti, Rotoehu, Okaro and the Kaituna River.