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March 15, 2026
#hauora: Health warning issued after toxic algal bloom detected at Port Levy
Waatea Team
Posted On March 15, 2026
Health authorities have issued a public health warning after a toxin-producing algal bloom was detected in waters at Port Levy | Koukourarata on Banks Peninsula in Canterbury.
The warning follows routine environmental monitoring which found high levels of toxins associated with the bloom. Officials say the algae can produce substances that are harmful to both people and animals, prompting advice for the public to avoid contact with the water until the warning is lifted.
Health New Zealand says the bloom appears to be concentrated within Port Levy harbour, but people are being urged to exercise caution in nearby bays because the toxins can move with water currents.
Exposure to toxic algae can cause a range of health problems. Symptoms may include skin irritation, stomach cramps, nausea, and tingling or numbness around the mouth and fingertips. Anyone experiencing symptoms after contact with the water is advised to seek medical attention and inform health professionals about possible exposure.
Residents and visitors are also being urged to keep pets away from the water. Dogs in particular can be at risk because they may ingest contaminated water or algae while swimming or exploring shorelines.
Te Rūnaka o Koukourarata has responded by placing a rāhui on the gathering of shellfish in the harbour as a precaution to protect public health and the wellbeing of the community. The temporary restriction is expected to remain in place while further water testing is carried out.
Authorities say ongoing monitoring will determine when the warning can be lifted, and they are encouraging people to stay informed about water quality conditions before undertaking recreational activities in the area.
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