Algae stable locally, but growing in Darling system

The water may have a green tinge and musty or organic odour and should be considered as unsuitable for potable use and alternative supplies or prior treatment of raw water for domestic purposes should be considered.

The water may also be unsuitable for stock watering.

The water remains suitable for recreational use, however algal concentrations can change rapidly.

Water users should use caution and avoid water where signs of blue-green algae present.

Amber alerts are current at the Gulpa Creek at Mathoura, Edward River at Old Morago and in the Murray River at Moama and Tocumwal.

At green alert levels, blue-green algae are present in the water at low densities, possibly signalling the early stages of the development of a bloom, or a period where a bloom is declining.

At these densities, the blue-green algae do not pose a threat to recreational, stock or domestic use.

Green levels are current in the Edward River at Deniliquin and Murray River at Picnic Point.

But amber alert levels were recorded in the Murray at Picnic Point in two of the past six tests, so users are asked to keep an eye on conditions and levels.

The Wakool River at Wakool-Barham Rd and Murray River at Barham have both been downgraded to green from amber.

The alert levels in the Billabong Creek at Jerilderie has been removed after six consecutive tests, or more, of lower algal bloom counts.

Red alert levels in other parts of NSW are growing, with most in the Darling River system.

In these areas blue-green algae may be visible as clumps or as scums and the 'blooms' should be considered toxic to humans and animals.

The water should not be used for drinking (without prior treatment), stock watering, or for recreation.

Red alert levels are in place at Menindee and in the Darling River at Ellerslie, Pooncarie, Tolarno, Caulpaulin and Wilcannia.

A red alert level has also been recorded at the Lake Brewster Regulator C on the Lachlan River system near Hillston and the Lachlan Valley National Park.

An interactive map of algae alerts is available at www.waternsw.com.au/water-services/water-quality/algae-alerts.