Warnings and Alerts

Active warnings and alerts for Canterbury region

• Lake Hood - health warning for cyanobacteria bloom

  16 MAR 2023 By ENVIRONMENT CANTERBURY

  Issued: 16 March 2023 Health Warning – Algal Bloom in Lake Hood and canals Te Mana Ora | Community and Public Health has issued a health warning after potentially toxic blue-green algae (planktonic cyanobacteria) was found in Lake Hood and its canals. People should avoid the Lake and animals, par...
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  Phormidium - River cyanobacteria warnings

  10 MAR 2023 By ENVIRONMENT CANTERBURY

  HEALTH WARNING UPDATE ISSUED BY CDHB: River warnings are now in place for potentially toxic benthic algae (cyanobacteria) in the: Ashley/Rakahuri River at Rangiora-Loburn Bridge (Cones Road) Selwyn River/Waikirikiri at Glentunnel Camping Ground  Selwyn River/Waikirikiri at Whitecliffs Domain (c...
• Lake Rotorua - permanent cyanobacteria health warning

  6 MAR 2023

  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 regula...
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  Lake Opuha cyanobacteria warning

  1 MAR 2023 By ENVIRONMENT CANTERBURY

  Issued: 1 March 2023 Health Warning – Algal Bloom in Lake Opuha Te Mana Ora | Community and Public Health has issued a health warning after potentially toxic algae scums (planktonic cyanobacteria) were found in Lake Opuha. People should avoid contact with the lake and downstream water bodies unt...
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  Saltwater Creek cyanobacteria warning

  23 FEB 2023

  Issued: 23 February 2023 Health Warning – Algal Bloom in Saltwater Creek (Ōtipua) at Centennial Park Te Mana Ora | Community and Public Health has issued a health warning for Saltwater Creek, (Ōtipua) at Centennial Park. The warning follows potentially toxic algae (planktonic cyanobacteria) scums...
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  Lake Forsyth/Te Roto o Wairewa cyanobacteria health warning

  31 JAN 2023 By ENVIRONMENT CANTERBURY

  31 January 2023: Health warning due to Algal Bloom in Te Roto o Wairewa/ Lake Forsyth Te Mana Ora | Community and Public Health has issued a health warning after potentially toxic blue-green algae (planktonic cyanobacteria) was found in Te Roto o Wairewa - Lake Forsyth People should avoid the l...
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  Advisory Note - Cyanobacteria present in a number of Canterbury rivers

  11 JAN 2023 By CANTERBURY ADMIN EG

  Advisory Note: Caution – Low levels of cyanobacteria mats (toxic algae) are present in a number of Canterbury rivers. The following advice is for dog owners. Information on the Can I Swim Here page (including health warnings) is for human health.    Environment Canterbury has found benthic cyanob...
• Advisory Note: Potentially toxic algae mats found

  2 DEC 2022 By ENVIRONMENT CANTERBURY (EG)

  Advisory Note: Potentially toxic algae mats found Dog owners are advised that potentially toxic algae mats have been observed at Lake Aviemore at the Waitangi boat ramp. Advice is to restrict dog access to this area and keep an eye out for black mats floating near the shore. If your dog becomes il...
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  Lake Pegasus cyanobacteria warning

  3 NOV 2022

  Issued: 2 November 2022 Health Warning – Algal Bloom in Lake Pegasus Te Mana Ora Community and Public Health, part of Te Whatu Ora National Public Health Service, has issued a health warning after potentially toxic blue-green algae (planktonic cyanobacteria) was found in Lake Pegasus. People sh...
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  St Annes Lagoon/Mata Kopae cyanobacteria warning

  7 JUL 2022 By ENVIRONMENT CANTERBURY

  Permanent Health Warning for Algal Bloom at Mata Kopae/St Anne’s Lagoon. Issued: 7 July 2022 Long term water testing indicates that potentially toxic cyanobacteria bloom periodically in Mata Kopae/St Anne’s Lagoon. There is a permanent health warning advising people (and animals) to avoid contact...
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  Te Waihora/Lake Ellesmere cyanobacteria warning

  8 FEB 2022

  8 February 2022 Canterbury DHB’s Community and Public Health unit has issued a health warning after potentially toxic blue-green algae (planktonic cyanobacteria) was found in Te Waihora (Lake Ellesmere). People should avoid the Lake and animals, particularly dogs, should not be allowed near the wa...