Prime swimming spots in Wairarapa and Kāpiti affected by toxic algae

Friday, 12 February 2021

Swimmers and dog owners have been warned that toxic algae has been detected at popular swimming spots in the Ruamāhanga River and Ōtaki Rivers.

Toxic algal blooms are affecting a growing number of Wairarapa and Kāpiti’s top swimming spots, with people warned to keep children and pets away from the water’s edge.

Greater Wellington Regional Council has advised caution to swimmers in the Ruamāhanga and Kāpiti Coast catchments and to keep dogs on leashes.

There are amber alert level warnings for Ōtaki River and the whole of the Ruamāhanga River.

Senior environmental scientist Dr Mark Heath said strongly advised to check for toxic algae before swimming.

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“With warm and dry weather predicted over the next week it is likely that this risk will increase.”

Greater Wellington urged people to check for LAWA website warnings and alerts, following the emergence of toxic algal blooms in several rivers in both the Ruamāhanga and Kāpiti Coast catchments.

“These warnings are in addition to amber alert warnings that are already in place along the Waikanae River in Kāpiti, as well as Waipoua River and Waingawa River in the Ruamāhanga catchment.

“It’s important we all scrub up on the facts, so we can all keep safe this summer, as toxic algae can be harmful to people and dogs,” Heath said.

Algal mats grow on the rocks in the riverbed and form leathery dark green or black mats, which can break off and accumulate at river edges.

“As the algal mats dry out they can become light brown colour, and have a distinctive deep earthy or musty smell,” Heath said.

Dogs were mostly at risk because they like the smell and taste of toxic algae. Even a small amount – about the size of a 50 cent piece, can be enough to kill a dog.

Owners especially needed to be vigilant of their dogs sniffing out toxic algal mats which can wash up at river edges.

Stuff contacted the major veterinary clinics in Wairarapa and Ōtaki and there were no reports of toxic algae poisoned dogs recently.

Greater Wellington monitored popular swimming spots on a weekly basis to make sure the community knows when it’s safe to swim.

If you have been in contact with toxic algae and are feeling unwell see your doctor or ring Healthline 0800 611 116.