All SES volunteers are required to have two doses of a COVID-19 vaccine, leading to concerns some units have closed due to limited numbers.
But the SES has denied that's the case, with a spokesperson telling AAP only a very small percentage of volunteers are unvaccinated and it has had no overall impact to service delivery.
"VICSES is incredibly proud of the role of our volunteers during this emergency who have responded to over 7200 calls for help in the past seven days and conducted more than 750 flood rescues," the statement reads.
It comes as several towns in Victoria's north continue to build sandbag walls as the Murray River rises, expecting to peak from Wednesday.
Evacuation warnings are in place for people in Echuca and other towns along the river.
Emergency services are concerned river levels could exceed the 94.77 metres recorded in Echuca during the 1993 floods.
More than 1000 Echuca properties were already inundated with floodwaters on Sunday after the Campaspe River broke its banks.
There are also concerns the rural town of Kerang, about 95 kilometres northwest of Echuca, will become isolated due to floodwaters.
Major flooding at Kerang along the Loddon River is expected overnight on Tuesday and into Wednesday, with the water forecast to peak around the January 2011 level soon after.
A sandbag levee is expected to help keep the majority of the town dry but it could be cut off for up to seven days.
A warning has also been issued for the Wimmera River, with Horsham residents told major flooding is possible from Wednesday morning.
A new evacuation warning has been issued for the small town of Barmah near Shepparton, which is expected to be severely impacted by Wednesday afternoon.
With the crisis growing, the federal government on Tuesday expanded the one-off, non-means tested disaster recovery payment of $1000 per adult and $400 per child to the Benalla, Boroondara, Central Goldfields, Greater Bendigo, Loddon, Moonee Valley, Mount Alexander, Murrindindi and Yarra local governments.
The assistance was already open to those in the Campaspe, Greater Shepparton, Maribyrnong, Mitchell and Strathbogie councils.
The Melbourne council is not included, despite the suburb of Kensington getting flooded on Friday by the Maribyrnong River.
Victorian Premier Daniel Andrews visited Shepparton on Tuesday morning, where the floodwaters are finally receding.
The water is expected to stick around the residential areas of the city for the next 48 hours, with authorities pleading for locals to stay away until the evacuation order expires.
Other Victorian towns are moving to the clean-up phase, with the state government on Monday announcing a $351 million flood recovery package.
The disaster funding includes $165 million in emergency road fixes such as filling potholes and repairing surfaces to get people and freight moving.
Close to 13,000 people have applied for state relief payments, with almost 4000 people already receiving support.
The state government also confirmed fees would be waived for those in 46 local government areas trying to remove flood waste until December 31.
It is projected 300,000 tonnes of waste will be sent to landfill as a result of the floods.
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