Is there not a website, either state or federal, where one can go and report contacts? Why does the roll need to be performed by boots on the ground (exclusive

Is there not a website, either state or federal, where one can go and report contacts? Why does the roll need to be performed by boots on the ground (exclusively?). I could just be ill-informed here. We have one active case in hospital quarantine here is Tasmania who is a resident returning from Victoria, and I’m not really paying much attention so.