Red Alerts for toxic blue-green algae in Back Country water supplies

Water NSW has issued a red alert for Lake Brewster Regulator C and the outlet channel, near Hillston, in the Carrathool Shire.

The dominant toxic species is Raphidiopsis raciborskii, the same species in play in the red alerts reported at Lake Cargellico and orange alerts at Yanga Lake, near Balranald, in past weeks.

Raphidiopsis raciborskii has the ability to affect the liver and kidneys in humans, as well as cause mild skin reactions upon exposure.

A new Red Alert has been raised at Burrinjuck Dam due to high levels of potentially toxic blue-green algae, Microcystis. 

The Red Alert warning applies only to untreated water at the identified location and will remain in place until monitoring and test results confirm that the risk is sufficiently diminished. People should avoid consuming untreated water from this waterbody and prevent pets and livestock from drinking this water.

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.

This type of algae, Microcystis, may produce chemicals that interfere with human and animal hormones.

The ongoing orange Microcystis alert for the Lachlan/Kalare River at Booligal remains in place.

For more information, visit WaterNSW Algae Alerts Map or WaterInsights. 

What do the colour coded alerts mean?

Essentially, the system progresses from "low risk" (green) to "high risk" (red), with amber serving as a warning to be cautious.

Green Alert: This indicates a low level of algae. The algae present are not considered a threat to recreational activities, livestock, or domestic use.

Amber Alert: This signifies that algae are increasing. The water might have a green tint and an odor. While recreational use is still possible, caution is advised.

The water is considered unsuitable for drinking without proper treatment, and may also be unsuitable for livestock.

Red Alert: This is the most serious level, indicating a "bloom" condition.

The water may appear very green, with visible clumps or scums of algae. The water is considered potentially toxic to humans and animals.

Activities like swimming, drinking the water, and allowing livestock to drink it are strongly discouraged.

It is also advised to not eat shellfish from these waters, and to take great care when consuming fish caught from these waters.