Ballina Shire Council has just issued a Red Alert for Lake Ainsworth.
Water should NOT be used for primary recreation. Users should obey all signage erected by Council.
Slicks and scums should be avoided when present as they are areas of concentrated algae and may present a health risk.
A Red Level Action Mode is in place when >50,000 cells of Microcystis aeruginosa are present or a biovolume of all toxin-producing cyanobacteria exceeds 4 mm3/L or if the total of all cyanobacteria (toxic and non toxic) exceeds 10 mm3/L or scums are present for long periods.
At Red Mode, local and health authorities should be contacted to assess risks to recreational users and appropriate measures should be taken to warn water users.