Toxic Algae Cyanobacteria

Toxic algae (also known as Cyanobacteria) is naturally present in many New Zealand waterways. It's found in ‘clean’ rivers but can grow when river flows are low and stable, and temperatures are consistently warm. Council routinely monitors its level and informs the community when action needs to be taken.


Most parts of rivers will not have cyanobacteria. Take usual care and be aware of cyanobacteria and risks. Check weekly council monitoring and alert updates.