Glad to see you here. The whole situation is just so overwhelming. I feel for you and everyone who's hearts are broken.
I am hoping that many of the extra costs associated with rebuilding will eventually be funded, through one avenue or another. There is so much information to sift through, and everyone has a slightly different need.
I have always found Murrindindi Shire good to work with. And I thoroughly recommend sewerage treatment plants, we have had ours for more than ten years and it works well for its intended purpose and for the garden. Good luck with your build.