Routine monitoring for potentially toxic planktonic cyanobacteria is carried out at a number of popular lake sites throughout Canterbury that are used for contact recreation. Routine monitoring is carried out monthly for Te Wairewa/Lake Forsyth and Te Waihora/Lake Ellesmere, with monitoring increasing in frequency when potentially toxic planktonic cyanobacteria are identified.
Additionally, visitors to lakes and ponds are advised to keep a look out for areas where bright green or blue-green visible scums are forming.
For more information and what to look out for see below or check out http://edit.ecan.govt.nz/services/online-services/monitoring/swimming-water-quality/Pages/Potentially-Toxic-Cyanobacteria.aspx
Lake Warnings in place for toxic algal blooms - Updated 20 November 2014
Te Wairewa/Lake Forsyth – no warning in place
Last updated 20 November 2014
Recent water testinghas shown that concentrations of potentially toxic cyanobacteria are now belowthe trigger levels that are of concern to public health. Environment Canterburywill continue to monitor the lagoon on a monthly basis. The public will beinformed if testing shows that concentrations have increased and there is riskto public health again.
Te Waihora/Lake Ellesmere – warning in place
Last updated 9 September 2014
Recent water testing has shown that there is a bloom of the potentially toxic cyanobacteria Picocyanobacteria. At present there are no blooms of the more conspicuous scum forming toxic taxa Nodularia or Anabaena. The Canterbury Medical Officer of Health, Dr Alistair Humphrey, has issued a health warning and advises people to avoid contact with water at this lake until further notice. Environment Canterbury will continue to monitor the lake and the public will be advised when the algal bloom has cleared.
St Anne’s Lagoon/Mata Kopae – no warning
Last updated 3 November 2014
Recent water testing has shown that concentrations of potentially toxic cyanobacteria are now below the trigger levels that are of concern to public health. Environment Canterbury will continue to monitor the lagoon on a monthly basis. The public will be informed if testing shows that concentrations have increased and there is risk to public health again.
Lake Rotorua (near Kaikoura) – permanent warning in place
Last updated 17 October 2014
Long term water testing indicates that there is a regular bloom of the potentially toxic cyanobacteria Anabaena and/or Microcystis present. There is a permanent health warning advising people to avoid contact with water at this lake. Environment Canterbury continues to monitor the lake on a regular basis.
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