A green level alert is currently in place for Deniliquin, meaning the algae is 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 algae does not pose a threat to recreational, stock or domestic use, but routine sampling for algae should be undertaken.
In both Moulamein and Old Morago, an amber alert is in place. This means the algae may be multiplying in numbers, with the water possibly having a green tinge and musty or organic odour. The water should be considered as unsuitable for potable use and stock watering, but remains suitable for recreational use.
However algal concentrations can change rapidly, so water users should use caution and avoid water where signs of blue-green algae present. At this alert level increased sampling of algae is advised.
Red alert levels, currently in place in parts of the the Murray River, represent ‘bloom’ conditions. The water may appear green and may have strong, musty or organically polluted odours. Blue-green algae may be visible as clumps or as scums, and the ‘blooms’ should be considered to be toxic to humans and animals, and the water should not be used for drinking without prior treatment, stock watering or for recreation.
Red alert level blue-green algae has been identified along the Murray River as close as Mt Dispersion, Buronga, Merbein, Curlwaa, River Murray Pump Station and Fort Courage.
For more information and updated alerts, visit www.waternsw.com.au/water-quality/algae#stay.