Non-toxic blue-green algae has been detected following routine water sampling at Malmsbury Reservoir.
An alert has now been issued for Malmsbury Reservoir and parts of Coliban Water’s rural channel system, which provides water for irrigation and stock use for rural customers.
Results showed the presence of low-level blue-green algae, which may impact the appearance and odour of the water. We have increased our sampling and testing procedures at Malmsbury Reservoir and in our network of rural channels, and will continue to monitor conditions and keep customers informed.
Rural customers on the following channels should take precautions while the alert is in place:
- Coliban Main 1
- Coliban Main 4/1
- Coliban Main 4/3
- Abbotts
- Diamond Hill
- Emu #1 (Eppalock)
- Emu Valley #1
- Emu Valley #2
- Mannes
- Spring Gully
- Strathfieldsaye
- Maiden Gully
- Myers Flat
- Lockwood
- Marong
- South Lockwood Pipeline
- Speciman Hill
- Wilsons Hill
Note: Rural customers in the Ascot and Cockatoo Hill systems are not impacted.
Rural customers are advised that water supplied via the channel remains safe for irrigation purposes.
However, people, stock and pets should avoid contact with the water.
Blue-green algae is not always visible, and does not always colour the water blue or green. While the risk is considered low, the health of stock or animals should be monitored.
Malmsbury Reservoir has been closed for on-water recreational use. Visitors and recreational users are advised to avoid contact with the water.
While people and dogs are not permitted in the water at Malmsbury Reservoir, if contact has been made rinse contact areas with fresh water. Those fishing are urged to rinse and clean their catch carefully in fresh water and only eat the flesh of the fish and discard any internal organs.
Blue-green algae is naturally-occurring bacteria found in rivers, reservoirs and water storages. It is not uncommon to have outbreaks at this time of year when the water is warmer and more sunlight create the ideal conditions for these organisms to grow.
The impact of wet weather and flooding in 2022, including high levels of run-off, has contributed to a greater number of algal blooms this summer across the state. Cooler temperatures and rainfall typically assist to flush the algae from impacted areas.
Further information is available at www.coliban.com.au/interruptions. Potentially impacted rural customers have been contacted directly via SMS. Updates will be provided on our website and social media channels.
Customers with concerns can contact our 24-hour enquiry line on 1300 363 200.
Last updated on 14 Feb 2023