Lake Arapuni cyanobacteria warning: Health warning lifted after tests

The health warning has been lifted for Lake Arapuni. Photo / NZME

The public health warning issued for Lake Arapuni last month has now been lifted.

Subsequent tests have shown cyanobacterial levels are now below the warning level. Lakes Rotoroa (Hamilton Lake), Ngā Roto, Hakanoa, Waikare, Rotokauri, Whangape and Kainui continue to have a health warning in place.

Health New Zealand – Te Whatu Ora medical officer of health for Waikato Dr Richard Wall recommends where cyanobacteria health warnings are in place, lakes should not be used for any activity that involves skin contact with the affected water.

“Swallowing water from lakes affected by blooms should also be avoided,” Wall said.

Cyanobacteria can release toxins that can trigger asthma and hayfever symptoms and can cause skin rashes, stomach upsets, and in some cases neurological effects such as tingling around the mouth, headaches, breathing difficulties and visual problems.

These symptoms may not appear until some time after contact with the affected water.

“Scums are a particular risk because they contain a high level of toxins. If contact with scum does occur, skin should be rinsed clean and clothing changed as soon as possible. This warning is particularly important for children,” Wall said.

“If people do come into contact with the lake when warnings are in place, or any other lake where there are visible changes to water colour, they should shower and change their clothing as soon as possible afterwards, even if no symptoms are noticeable.”

Dog owners should prevent their dogs from drinking or swimming in the water, as dogs are particularly sensitive to cyanobacteria.

Health NZ would like to be informed about health problems that develop after exposure to any of the Waikato lakes. Phone: 07 838 2569.

Up-to-date information on cyanobacterial cell counts is available from local councils, Waikato Regional Council or by visiting the Land Air Water Aotearoa (Lawa) website.

Stay up to date with the Waikato Herald and Te Awamutu Courier

Get the latest Waikato headlines straight to your inbox Monday to Saturday. Register for free today - click here and choose Local News.