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Health warning lifted for algal bloom on the Waihi River

5 March 2019

Health warning lifted for algal bloom on the Waihi River at the Wilson Street Footbridge, Geraldine

Community and Public Health has lifted its algal bloom health warning issued for the Waihi River at the Wilson Street Footbridge, Geraldine.


Recent river surveys have shown that the quantity of potentially toxic blue-green algae (benthic cyanobacteria) has decreased and algal coverage is now below the levels that are of concern to public health.

Canterbury Medical Officer of Health Dr Ramon Pink says recent river surveys have shown the quantity of potentially toxic blue-green algae (benthic cyanobacteria) has decreased and algal coverage is now below the levels that are of concern to public health.

“The public will be informed if testing shows that concentrations have increased and there is a risk to public health again,” Dr Pink says.

Warnings remain in place at:

Waihao River near Bradshaws Road

Facts about cyanobacteria:

• Appears as dark brown/black mats attached to rocks along the riverbed.
• The algae occur naturally but can increase rapidly during warmer months.
• It often has a strong musty smell and algal toxin concentrations can vary over short periods with changing environmental conditions.
• Although high river levels will remove the algal bloom, detached mats can accumulate along the shore and increase the risk of exposure to toxins.
• If a health warning is in place avoid contact with the water.
• Although district or city councils may place warning signs, these may not be seen at the numerous river access points, hence the need for people/ dog-walkers to treat every low-flowing river cautiously.


For more details visit: https://ecan.govt.nz/your-region/your-environment/water/swimming-water-quality/

Or contact Community and Public Health, Timaru directly on (03) 687 2600.

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