Category: Health Alerts

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CYANOBACTERIAL WARNING UPDATE: Health warning lifted for Lake Rotoroa (Hamilton Lake)

Source: Waikato District Health Board

CYANOBACTERIAL WARNING UPDATE: Health warning lifted for Lake Rotoroa (Hamilton Lake) and remains in place for Lake Ngā Roto, Hakanoa, Waikare and Kainui.

The Public Health warning issued on 5 October 2023 for Lake Rotoroa (Hamilton Lake) has now been lifted, after subsequent tests showed that cyanobacterial levels to be once again below the warning level. Lakes Ngā Roto, Hakanoa, Waikare and Kainui continue to have a cyanobacterial health warning in place.

Waikato Regional Council monitors cyanobacteria levels at Lakes Kainui, Rotokauri, Ngā Roto, Puketirini, Waikare, Whangape, Hakanoa and Waahi.

Dr Felicity Dumble, Te Whatu Ora Medical Officer of Health for Waikato recommends that 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,” said Dr Dumble.

Cyanobacteria can release toxins which 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.”

“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,” she said.

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

Te Whatu Ora Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes.

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 at https://www.lawa.org.nz/explore-data/waikato-region/

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CYANOBACTERIAL WARNING UPDATE: Health warning lifted for Lake Whangape

Source: Waikato District Health Board

CYANOBACTERIAL WARNING UPDATE: Health warning lifted for Lake Whangape and remains in place for Lakes Rotoroa (Hamilton Lake), Ngā Roto, Hakanoa, Waikare and Kainui.

The Public Health warning issued on 7 July 2021 for Lake Whangape has now been lifted, after subsequent tests showed that cyanobacterial levels to be once again below the warning level. Lakes Rotoroa (Hamilton Lake), Ngā Roto, Hakanoa, Waikare and Kainui continue to have a cyanobacterial health warning in place.

Waikato Regional Council monitors cyanobacteria levels at Lakes Kainui, Rotokauri, Ngā Roto, Puketirini, Waikare, Whangape, Hakanoa and Waahi.

Dr Felicity Dumble, Te Whatu Ora Medical Officer of Health for Waikato recommends that 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,” said Dr Dumble.

Cyanobacteria can release toxins which 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.”

“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,” she said.

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

Te Whatu Ora Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes. Phone Waikato Public Health Service: 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 at https://www.lawa.org.nz/explore-data/waikato-region/

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Health warning issued for Lake Ngā Roto

Source: Waikato District Health Board

CYANOBACTERIAL WARNING UPDATE: Health warning issued for Lake Ngā Roto and remains in place for Lakes Rotoroa (Hamilton Lake), Hakanoa, Whangape, Waikare and Kainui.

A new health warning has been issued today for Lake Ngā Roto due to a significant rise in cyanobacteria levels. Lakes Rotoroa (Hamilton Lake), Hakanoa, Whangape, Waikare and Kainui continue to have a cyanobacterial health warning in place.

Cyanobacterial bloom at Lake Ngā Roto – image courtesy of Mark Foster

Waikato Regional Council monitors cyanobacteria levels at Lakes Kainui, Rotokauri, Ngā Roto, Puketirini, Waikare, Whangape, Hakanoa and Waahi.

Dr Richard Vipond, Te Whatu Ora Medical Officer of Health for Waikato recommends that 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,” said Dr Vipond.

Cyanobacteria can release toxins which 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.”

“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,” he said.

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

Te Whatu Ora Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes.

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

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CYANOBACTERIAL WARNING UPDATE: Health warning issued again for Lake Rotoroa (Hamilton Lake) and remains in place for Lakes Hakanoa, Whangape, Waikare and Kainui

Source: Waikato District Health Board

A health warning has as of today been placed on Lake Rotoroa. An earlier health warning had only been lifted recently on Thursday 28 September 2023. However, a highly unusual incidence of cyanobacterial species growth has occurred over the past few days, causing increased levels in more recent laboratory testing. The warning signs at the lake will continue to show the ‘Alert’ warning until two consecutive samples show that the risk has decreased.

Lakes Hakanoa, Whangape, Waikare and Kainui continue to have a cyanobacterial health warning in place.

Cyanobacteria levels are regularly monitored at Lakes Rotoroa, Kainui, Rotokauri, Ngā Roto, Puketirini, Waikare, Whangape, Hakanoa and Waahi.

Dr Richard Vipond, Te Whatu Ora Medical Officer of Health for Waikato recommends that where cyanobacteria health warnings are in place, lakes should not be used for any recreational activity that involves contact with the affected water.

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

Cyanobacteria can release toxins which 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.”

“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,” he said.

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

Te Whatu Ora Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes.

Phone Waikato Public Health Service: 07 838 2569

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CYANOBACTERIAL WARNING UPDATE: Health warning issued for Lake Rotoroa (Hamilton Lake) and remains in place for Lakes Hakanoa, Whangape, Waikare and Kainui

Source: Waikato District Health Board

A health warning was placed in late August 2023 at Lake Rotoroa (Hamilton lake), and remains in place with more recent laboratory testing showing increasing levels of cyanobacteria. The warning signs at the lake will continue to show the ‘Alert’ warning until two consecutive samples show that the risk has decreased.

Lakes Hakanoa, Whangape, Waikare and Kainui continue to have a cyanobacterial health warning in place.

Cyanobacteria levels are regularly monitored at Lakes Rotoroa, Kainui, Rotokauri, Ngā Roto, Puketirini, Waikare, Whangape, Hakanoa and Waahi.

Dr Richard Wall, Te Whatu Ora Medical Officer of Health for Waikato recommends that where cyanobacteria health warnings are in place, lakes should not be used for any recreational activity that involves contact with the affected water.

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

“Cyanobacteria can release toxins which 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.

“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,” he said.

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

Te Whatu Ora Public Health Unit for Waikato would like to be informed about health problems that develop after exposure to any of the Waikato lakes.
Phone Waikato Public Health Service: 07 838 2569