HIGH levels of blue-green algae have returned to the Darling-Baaka River at Pomona, and a red alert has been issued for untreated water between the township and the Wentworth Weir.

The red alert was raised by WaterNSW due to algal scum becoming visible on the river's surface.

The warning applies only to untreated water, and will remain in place until monitoring and test results confirm the risk ...