Blue-green algae red alert for Burrendong Dam

11 FEBRUARY 2026

WaterNSW has issued a Red Alert advisory for high levels of potentially toxic blue-green algae for Burrendong Dam.

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.

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. People who suspect they have been affected by blue-green algae should seek medical advice, and pets and livestock should be kept from drinking affected water. Boiling water does not inactivate algal toxins.

Blue-green algae are naturally occurring and can reproduce quickly in still or slow-flowing water when there are abundant sunlight and sufficient nutrients.

Water users should be aware of the risks associated with entering any waterway in NSW. These waters are untreated, their quality is unknown, and conditions can change rapidly. Always exercise caution and assess the risks. All untreated water should be considered unsuitable for potable use.

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 waternsw.com.au/algae or WaterInsights.

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