Blue-green algae Red Alert for Lake Menindee
8 JANUARY 2026WaterNSW has issued a precautionary Red Alert warning for high levels of potentially toxic blue-green algae for Lake Menindee. The current advice is based on satellite imagery indicating high levels of algal activity across the lake’s surface. Sampling at the lake is to follow.
The Red Alert warning applies only to untreated water at the identified location and will remain in place until monitoring confirms that the risk is sufficiently diminished.
People should avoid consuming untreated water from this waterbody and prevent pets and livestock from drinking the water. People should also avoid recreational activities such as swimming, water skiing, canoeing and any other activity that brings them into contact with the water 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 who suspect they have been affected by blue-green algae should seek medical advice. 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.
Blue-green algae are naturally occurring and can reproduce quickly in still or slow-flowing water when there are 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 WaterInsights.
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