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Home / Hawkes Bay Today

Central Hawke’s Bay: Toxic algal bloom in Tukituki River prompts health warning

Hawkes Bay Today
9 Dec, 2025 10:49 PM2 mins to read

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The area (in red) where unsafe levels of toxic algal bloom have been discovered. Photo / LAWA

The area (in red) where unsafe levels of toxic algal bloom have been discovered. Photo / LAWA

Toxic algal bloom discovered in a section of the Tukituki River has led to a health warning for people and animals to avoid contact with the river in that area.

Health NZ Te Whatu Ora issued a health warning on Wednesday for the Tukituki River near Walker Rd in Waipawa, close to where the Waipawa River joins the Tukituki.

The warning follows the discovery of potentially dangerous levels of toxic algae (microcoleus) there by Hawke’s Bay Regional Council.

People should avoid swimming in the area and animals, particularly dogs, should not be allowed near the water until the health warning has been lifted.

The regional council is monitoring the river and the public will be advised of any changes in water quality.

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National Public Health Service medical officer of health Dr Nicholas Jones​​ said the algae looked like dark brown or black mats and could produce toxins harmful to people and animals.

Algal blooms produce toxins harmful to humans and animals. Photo / File
Algal blooms produce toxins harmful to humans and animals. Photo / File

“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,” he said.

“If you experience any of these symptoms, visit your doctor immediately; also, let your doctor know if you’ve had contact with dark brown [or] black algal mats or water in this area.”

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Other access points along the Tukituki may have the algae present.

People are asked to be wary and check for the presence of the algal mats and avoid contact.

Pets that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.

Microcoleus often attaches itself to rocks along the riverbed and often has a strong musty smell. High river levels will help remove the algal bloom.

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