LPSC mayor Andrew Hope said the council had spent most of the past week putting information together for the declaration, and had notified the state's emergency services department that "it's coming".

This information includes "quotes and costs" to fix up the damage caused by extreme rainfall last month.

LPSC general manager Joanne Sangster said the council was doing a "thorough assessment" of the total damage.

"The most important thing is to get it right and to make it as comprehensive as possible," Ms Sangster said.

It comes after infrastructure was washed away or severely damaged during flash flooding, bringing the council's bill to over $2 million.

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Cr Hope said if the council was successful in gaining extra funding, it would allow them to make sure they would never be hit so hard again.

"We would improve upon the asset rather than patch it up, so if we get another incident like this we're not going back and asking for funds again," Cr Hope said.

"If we're successful in getting the funds that will allow us to do that without modifying the budget so we can get on with normal work through the year and council can replace the infrastructure, too."

The mayor said most of the "critical infrastructure is back online", with minor issues still being worked on by council crews. Wallabadah's boil order has also been lifted.

"The roads crews are tidying up the minor incidents like mudslides. The crews have been outstanding and achieved a lot, it's a credit to how hard they can work," he said.

"Considering the damage that was done and the hurdles that were tackled for the water supplies, it was less than a week from start to finish."