Stay safe around freshwater as this summer
21 January 2026
With temperatures climbing across Western Australia, remember to take extra care around untreated or poorly treated water to reduce the risk of amoebic meningitis – a rare but potentially fatal infection linked to warm freshwater.
The illness is caused by Naegleria fowleri, an amoeba that thrives in warm conditions. When water containing the organism is forced up the nose, it can lead to severe inflammation and destruction of brain tissue.
The amoeba can naturally occur in lakes, rivers, and farm dams once water temperatures exceed 28°C. It may also be found in garden hoses, spas, and swimming or wading pools that are not properly maintained during hot weather. Rural and regional residents who rely on tank, bore, or dam water face a higher risk, as do people using inadequately chlorinated pools or spas.
Swimming is a great way to stay active and cool, but certain conditions increase the likelihood of harmful bacteria, algae, and amoebae. Avoid warm, slow‑moving, or stagnant water – especially near stormwater drains.
If you are unsure about the water quality, do not swallow water or submerge your head. Rainfall can wash pollutants from streets, gardens, and farms into waterways – which raises bacterial levels and increases risk of illness. As a precaution, avoid swimming for one day after heavy rain in coastal areas and for three days in rivers, lakes, dams, and estuaries.
If you have an open wound or infection, stay out of the water to prevent further complications. Water that appears murky, discoloured, or has an unpleasant smell is another clear sign to stay away.
As you embrace the summer heat, remember that simple precautions can help everyone enjoy the water safely.