skip to main content
Site banner

Keep an eye out for toxic algae in our rivers and streams this summer. During summer, with higher temperatures and lower water levels, the algae (cyanobacteria) can form extensive blooms which can be toxic, particularly to dogs if they eat it. Even a small amount can kill a dog. In rivers, cyanobacteria generally form brown or black mats that grow on rocks in the riverbed. Greater Wellington Regional Council has useful information about how to spot toxic algae and has an interactive water quality map – see

Watch out for toxic algae in rivers



+ Text Size -