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Health warning removed for algal bloom at Lake Forsyth
14 November 2019
For immediate release
Health warning removed for algal bloom at Lake Forsyth/ Te Roto o Wairewa
Canterbury District Health Board’s Community and Public Health unit has lifted its algal bloom health warning issued for Lake Forsyth/ Te Roto o Wairewa on the 1 October 2019.
Recent water testing at Lake Forsyth/ Te Roto o Wairewa, has shown the quantity of potentially toxic blue-green algae (planktonic cyanobacteria) in the lake has decreased and concentrations are now below the levels that are of concern to public health.
Canterbury Medical Officer of Health Dr Alistair Humphrey says Environment Canterbury’s sampling of Lake Forsyth/ Te Roto o Wairewa will continue on a fortnightly basis.
“The public will be informed if testing shows that concentrations have increased and there is a risk to public health again, but at least this means people can fully enjoy Lake Forsyth/ Te Roto o Wairewa during show weekend,” says Dr Humphrey.
Facts about cyanobacteria:
• The algae occur naturally but can increase rapidly during warmer months.
• Algal blooms are caused by a combination of nutrients in the water (such as nitrogen and phosphorus), and favourable weather conditions (e.g. increased temperature, calm days).
• If the water is cloudy, discoloured, or has small globules suspended in it, avoid all contact.
• Not all cyanobacterial blooms are visible to the naked eye and toxins can persist after the blooms disappear.
• Cyanobacterial concentrations can change quickly with changing environmental conditions (e.g. wind). If a health warning is in place avoid contact with the water.
For further information visit: https://www.lawa.org.nz/explore-data/canterbury-region/
Or contact Community and Public Health on (03) 364 1777:
https://www.cph.co.nz/your-health/recreational-water/
For more information about Mahinga Kai:
https://www.cph.co.nz/wp-content/uploads/saf0112.pdf
ENDS
Canterbury DHB
CDHB
Canterbury District Health Board (CDHB) is a Christchurch, New Zealand based hospital and healthcare provider for the
Canterbury region of New Zealand. Our region extends from Kekerengu in the North, to Rangitata in the South and Arthurs Pass in the West and comprises the six Territorial Local Authorities of Kaikoura, Hurunui, Waimakariri, Christchurch City, Selwyn and Ashburton.
We collaborate with other health and disability organisations, stakeholders and our community to decide what health and disability services are needed and how to best use the funding we receive from Government to improve, promote and protect the health, wellbeing and independence of our population.
At the Canterbury DHB, our vision is to improve the health and wellbeing of people living in Canterbury.
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