I remain hopeful that I shall be swimming this weekend.
My holiday reading so far has been a NSW government publication:
"GUIDELINES FOR MANAGING RISKS IN RECREATIONAL WATER"
http://www.nhmrc.gov.au/publications/synopses/_files/eh38.pdf with the aim of becoming as informed as possible about the risks associated with cyanobacteria (blue-green algae) blooms, and how these risks and the associated recommendations differ with the varying alert levels.
At present, Edwards River is on Amber Alert which means "the water remains suitable for recreational use". Yay! :) All the same, I think I definitely wont be putting my head under the water.