24 January 2019

Health Warning – Toxic Algal Bloom in the Waipara River at Teviotdale

Canterbury District Health Board’s Community and Public Health unit have issued a health warning for the Waipara River at Teviotdale.

The warning follows moderate cover of potentially toxic blue-green algae (benthic cyanobacteria) in the Waipara River at Teviotdale.

There are also other access points along the Waipara River that may have cyanobacteria present and people are advised to check for the presence of cyanobacteria and avoid contact.

People and animals, particularly dogs, should avoid the area of the Waipara River until the health warning has been lifted. Dr Alistair Humphrey Canterbury Medical Officer of Health, says the algae look like dark brown to black mats and can produce toxins harmful to people and animals.

“Exposure may cause skin rashes, nausea, stomach cramps, tingling and numbness around the mouth and fingertips,” Dr Humphrey says.

“If you experience any of these symptoms, visit your doctor immediately, also let your doctor know if you’ve had contact with dark brown/black algal mats or water in this area.”

No one should drink water from the river at any time.

Pets that show signs of illness after coming into contact with algal mats should be taken to a vet immediately.

Dr Humphrey says people and animals should remain out of the waterways until the warnings have been lifted.

Environment Canterbury is monitoring the sites and the public will be advised of any changes in water quality.

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 information visit: Environment Canterbury - Swimming Water Quality CDHB - Recreational Water LAWA - Can I swim here?

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