Blue-Green Algae Alert for Mannus Lake & Creek

Published on 12 January 2018

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Water NSW have issued a red level warning (high alert) for Mannus Lake and downstream Mannus Creek. This algal warning would be expected to continue to move further downstream with water flow.

Snowy Valleys Council Director Strategy, Community & Development Gus Cox said analytical results have been received that have confirmed high levels of a species of blue-green algae identified as potentially toxic.

“Council has erected warning signs at key recreational areas around the lake and creek which will remain in place on advice from NSW Water, while high levels of blue-green algae are present”, Mr Cox said.

NSW Water advises people not to enter the water, not to drink untreated water or bathe in water drawn from the lake or creek while this red alert level warning is in place.

“NSW Water have identified the species of blue-green algae as potentially toxic and may cause gastroenteritis in humans if consumed and skin and eye irritations after contact. They have advised that boiling the water does not remove algal toxins”, Mr Cox said.

Blue-green algae occur naturally and can reproduce quickly in favourable conditions where there is still or slow-flowing water, abundant sunlight and sufficient levels of nutrients.

Livestock owners are reminded to continue to check stock water supplies for blue-green algae and to remove stock from these waters where surface scum is visible or blue-green algae are suspected.

“It is not possible to predict how long the algae will remain at high levels. Council will continue to take water samples at intervals until two consecutive samples are below the required limit, where Water NSW will lift the alert”, Mr Cox said.

Council are continuing to communicate directly with affected landholders keeping them up to date with the latest news via email and phone calls.

“Council will continue to coordinate with appropriate Government Departments and consult with relevant algal experts to determine the cause of this event and possible ways to mitigate its reoccurrence”, Mr Cox said.

People who believe they may have been affected by blue-green algae are advised to seek medical advice.

Information updates about blue-green algae blooms and red level warning areas can be obtained from the Regional Algal Coordinating Committee free-call Algal Information Hotline on 1800 999 457 or visit –

For further information please contact Director Strategy, Community & Development Gus Cox on 6948 9116 or [email protected]

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