On Monday, February 26, WaterNSW issued a Red Alert advisory for high levels of potentially toxic blue-green algae for Burrendong Dam, 30 kilometres south-east of Wellington.
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It follows a similar alert in January 2024, when the community was advised not to drink untreated water from Burrendong Dam after "potentially toxic" levels of algae were detected.
This red alert warning applies only to untreated water at the dam and will remain in place until monitoring results confirm that the risk is sufficiently diminished.
People should not consume untreated water from this waterbody, prevent pets and livestock from entering and drinking this water.
Stock and domestic water users on the Macquarie River below Burrendong Dam should apply a level of caution. They should keep a check on water supplies and discontinue using these waters if algae become present.
People should avoid recreational activities such as swimming, water skiing, canoeing and any other activity that brings them into contact with this waterbody until the red alert warning is lifted.
Potentially toxic blue-green algae may cause gastroenteritis if consumed, while contact can cause skin and eye irritations. Consumption of water containing algal toxins may cause liver damage and other health problems. Boiling the water does not remove algal toxins.
People should not eat mussels or crayfish from red alert warning areas. A precautionary approach to eating fin fish from red alert warning areas is advised. Any fish caught should be cleaned and washed thoroughly in uncontaminated water; the internal organs should not be eaten. Avoiding fishing during a bloom is the best way to minimise risk.
People who suspect they have been affected by blue-green algae should seek medical advice.
Blue-green algae is naturally occurring and can reproduce quickly in still or slow-flowing water when there is abundant sunlight and sufficient nutrients.
Visit the local council or local water utility websites for information about the management of blue-green algae risks in the nearby treated drinking water supplies.
Updates and information about blue-green algae blooms and red level warning areas can be obtained by visiting - www.waternsw.com.au/algae or calling 1300 662 077.
