Interruptions

Blue-green algae detection - Mysia and Dingee

• Mysia and Dingee
• Friday 13 March until further notice

We are experiencing poor raw water quality due to blue-green algae being detected in the raw water supply at Mysia and Dingee.

We have increased our water quality testing program to monitor the situation more closely.

Customers in Mysia and Dingee are reminded that the town’s water supply is untreated and not suitable for drinking, food preparation, brushing your teeth or ice-making. It is recommended that pets are not given this water to drink.

For additional blue-green algae water quality information visit Connect Coliban.

Coliban Main Channel blockage - Sedgwick

• Coliban Main Channel, Sedgwick
• 18 February 2026 until further notice

Update, Friday 10 July

We have been carrying out works to clear a blockage in Wirths Tunnel near Youngs Lane in Harcourt North. This blockage was caused by debris from the Harcourt bushfires being washed into the Coliban Main Channel.

The main blockage has now been cleared. Crews are continuing to remove remaining debris from the tunnel to restore normal operations and improve system performance ahead of the next rural season.

Debris removed from the tunnel has been stockpiled near the intersection of Youngs Lane and Leanganook Track. This material is now being progressively relocated from the area, with full site reinstatement to follow. 

Work will continue during daylight hours, and nearby residents have been notified.

You may still notice some noise from machinery and an increase in traffic movements as crews complete the remaining clean up.

If you use the Leanganook Track near Youngs Lane, you may notice increased vehicle and machinery movements near the site. The track will remain open during works. Please take care and follow any signage or instructions when travelling through the area.

If you have any questions, please call us on 1300 363 200.

We apologise for any inconvenience caused during the works.  

Earlier 
We've identified a blockage on the Coliban Main Channel caused by debris from the recent fires in Harcourt.

The blockage was impacting our ability to deliver water to parts of the rural network for irrigation and stock use.

There is no impact to drinking water supplied to urban customers. 
 

Pipeline construction – Maiden Gully

• Maiden Gully
• 10 February to mid June

We are continuing works on the Maiden Gully to Marong Pipeline, a new 11-kilometre water pipeline constructed between Golden Square, Maiden Gully and Marong to boost capacity and improve water pressure and reliability in this key growth corridor.

You may notice us working in the power line easement between Edwards Road and Rocky Rises Road and in the easement between Olympic Parade, Maiden Gully, and Emily Way, Golden Square. 

We may need to temporarily close some sections of the easement during works. You will still be able to access your property.

All our works will be completed on weekdays between 7am and 5.30pm.  

Please take care when driving in the area and follow any traffic management that is in place. 

We apologise for any inconvenience. 

For more information visit connect.coliban.com.au/maiden-gully-marong-pipeline 

Blue-green algae - Upper Coliban Reservoir

• Upper Coliban Reservoir
• Tuesday 7 July until further notice

Updated
Due to reduced levels of blue-green algae in the water, Upper Coliban Reservoir has now re-opened for on-water recreation.

The use of kayaks, canoes and small portable craft, is now permitted.

Please avoid making contact with the water. The water is unsafe for humans or animals to consume. Due to this we also advise against shoreline fishing at this time. If contact has been made rinse any contact areas with fresh water.

We have increased our water quality testing program to monitor the situation more closely.

For additional blue-green algae water quality information visit here.

Earlier
Due to increased levels of blue-green algae in the water, Upper Coliban Reservoir is now closed for on-water recreation.

The use of kayaks, canoes and small portable craft is not permitted.

Please avoid making contact with the water. The water is unsafe for humans or animals to consume. Due to this we also advise against shoreline fishing at this time. If contact has been made rinse any contact areas with fresh water.

We have increased our water quality testing program to monitor the situation more closely.

For additional blue-green algae water quality information visit here.

Water and sewer main renewals - various locations

• Various locations
• September 2025 to mid-2026

The following program of renewals work is now underway as part of our $100 million Water and Sewer Upgrade Program. This work is being carried out to ensure our critical infrastructure can serve local communities for years to come. 

There will be no interruption to your water supply while the following works are being completed, except for a short period when your water supply will be transferred to the new main. Our contractor will let you know when this will occur.

You may notice lower water pressure from time-to-time during works. Impacted customers have been notified. 

Some traffic management may be in place for works.

You can read more about the Water and Sewer Upgrade Program here.