Toxic blue-green algae at Wyangala Dam near Crookwell triggers government warning

Blue-green algae has been identified near the dam wall, at the Inland Waters Park, and within the Lachlan River downstream.

An alert says drinking from the site is unsafe for humans, pets, or livestock. Recreational activities such as swimming and water sports are discouraged.

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Fish, mussels, or crayfish caught in the water system should not be consumed.

Blue-green algae - officially known as Cyanobacteria - is naturally occurring and can be caused by runoff after flood events. It cannot be treated by boiling.

The organism is known to cause gastroenteritis, liver damage, irritation, and other serious health problems.

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People who believe they may have been affected are urged to seek immediate medical advice.

NSWWater says its red alert will remain in place until "monitoring and test results confirm the risk is sufficiently diminished."

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