GMW are asking people to avoid direct contact with the water, saying that those who do should wash the affected in clean cold water right away.
They are also suggesting not to use the water with any livestock or pets and for people not to cook with the water.
The warning includes the Ghow (Kow) Swamp, The Macorna Main (No.2) Channel System, and the Pyramid-Box Creek Channel System, including the No.6 Channel System.
Warning signs will be posted at official recreational areas around Ghow Swamp and will stay there while high levels of blue-green algae remain.
GMW Water Quality coordinator Bianca Atley asked people to take care around the water.
“Blue-green algae occur naturally in waterbodies but contain toxins harmful to humans and animals,” she said.
“Contact with it can cause rashes; sore eyes, ears, and nose; or if swallowed, nausea or vomiting. It is therefore important people boating or enjoying activities near the water take extra precautions.”
It is not possible to predict how long the algae will remain at high levels.
People can stay up-to-date with blue-green algae warnings by ringing 1800 013 357 and selecting the option for blue-green algae information, or by visiting the GMW website: www.g-mwater.com.au/news/bga
Water supplied by GMW is not suitable for human consumption without first being properly treated.
Human consumption includes showering, bathing, washing, cooking, ice-making, and drinking.
For more information about blue-green algae and your health, phone NURSE-ON-CALL on 1300 606 024 or visit the Department of Health’s website at www.health.vic.gov.au
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