Blue-green Algae

Blue-green algae (BGA) blooms can be harmful to the health of people and animals.

Further information about blue-green algae is available from the Water and Catchments Group website or by calling 136 186.

Information on Health effects of Blue-green algae are available from Health.Vic website or by calling 1300 761 874 during business hours.

For enquiries about specific waterways it is best to contact the right agency.

For the Barwon River Contact
•  through Geelong from Breakwater to Buckley Falls Corangamite Catchment Management Authority (CCMA)
•  Lake Connewarre and Barwon Estuary Parks Victoria

We are the Local Water Manager and responsible for monitoring Blue-green algae in the following waterways:

  • Balyang Sanctuary, Newtown
  • Blue Waters Lake, Ocean Grove
  • Cowies Creek-Wetland, Lovely Banks
  • Eastern Park Lake, Geelong
  • Gateway Sanctuary, Leopold
  • Grinter Reserve wetland, Moolap
  • Hovells Creek, Lara
  • Lake Lorne, Drysdale
  • Lara Lakes, Lara
  • McLeods Waterholes (large lake only), Drysdale
  • St Leonard’s Lake, St Leonards
  • Seascape Drive Wetland, Indented Head
  • Zillah Crawcour Park-Waterhole, Newtown

Reasons for monitoring blue-green algae

Some types of blue–green algae blooms are toxic and direct contact can be harmful to the health of people and animals. We monitor and issue alerts for City-managed waterways where recreational activities may bring people or pets in direct contact with water.

We monitor blue-green algae in our waterways at times when there is a risk of blooms, usually from December to April each year.

Warning notices are given when blue-green algae blooms is detected at a level that pose a health risk. Notices are posted weekly in the City News section of local newspapers and on our website. Warning signs are also displayed on site at the affected waterways.

Be aware

Direct contact with blue-green algae can cause allergic reactions such as skin rashes or itchiness; sore eyes ears and nose or if swallowed gastroenteritis, nausea or vomiting.

People who come in to contact with contaminated water should wash immediately in fresh water. Seek medical advice if experiencing illness after contact with BGA affected water.

Pet owners should prevent pets from drinking or having direct contact with contaminated water. If contact occurs wash immediately in fresh water and seek Veterinary advice if pet shows signs of illness after contact with BGA affected water.

Page last updated: Wednesday, 15 November 2023