The Georges River is one of Sydney's healthiest rivers, there are still some precautions to take before you swim.

Don't swim near stormwater outlets and drains;
Don't swim within a few days of rain, as this washes pollution from roads and gardens into the River;
Don't swim if you notice rubbish, or a plume of discoloured water.
In the warmer months, jellyfish can sometimes be found in large numbers in the Georges River. Whilst these are not dangerous, they can be annoying and cause minor discomfort.

Whilst sharks have been sighted in the River, this is an unusual occurrence. The NSW Department of Primary Industries website have some tips for swimming in waters where sharks have been sighted.

Once upstream of Liverpool Weir, the Georges River turns fresh and neither jellyfish or sharks are a concern. However, you still need to be aware of stormwater pollution, particular near urban areas and main roads.