Greater Wellington Regional Council is advising people not to swim or walk dogs off-lead in and around the Waikanae
River below SH1 due to high levels of toxic algae.
Latest assessments show that toxic algae exceed safe levels in the river west of SH1, where river stones are covered and
detached mats have been seen.
“With continuing warm weather and a dry spell, we are seeing late season growth, so we are urging people to be careful
near the Waikanae River in particular, says Dr Mark Heath, Senior Environmental Scientist at Greater Wellington.”
Toxic algae are below warning levels in all other monitored waterways throughout the region.
Given the rapid growth of toxic algae, and its potential change in coverage between weekly monitoring points, people are
also urged to be able to recognise and avoid it. They should check out information signs around popular swimming holes
and visit Greater Wellington’s Is it Safe to Swim? website and Facebook page for more information about, and images of, toxic algae.
Toxic algae grow on submerged river stones in a shiny brown/dark green coating. When it dies it floats to the surface
and forms small brown mats at the water’s edge. It is important to keep an eye on babies and toddlers who are inclined
to put objects in their mouths, and dogs are naturally drawn to its odour. Anyone who swallows toxic algae should seek
medical attention.