Knowing whether or not you're in a flood zone is the first step in preparing for a flood. Generally speaking, if you live in a low-lying area or nearby a river, lake, creek, or major stormwater drain, it's possible that your home is at risk of flooding.
The easiest way to check your flood risk is through your local council. Most councils have publicly available flood maps (which include historical data from previous flooding events along with flood risk modelling) and floodplain management reports online. If not, you can visit your local council in person or contact them via phone or email and request access to flood risk data.
The following state and territory governments also offer state and territory-level flood maps online: