Tonimbuk flood map & planning overlays

The schematic on this page is a Tonimbuk flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 8% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Tonimbuk address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.

About 8% of Tonimbuk falls within a mapped flood overlay, against the council-wide suburb average of 42%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.

Around 100% of Tonimbuk is mapped as bushfire-prone, compared with a Cardinia average of 98%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.

The dominant planning zone in Tonimbuk is Green Wedge Zone (GWZ1), though the suburb also includes Rural Conservation Zone (RCZ1) and Public Conservation and Resource Zone (PCRZ). Zoning sets what you can build and do on a site, and can differ lot by lot.

Tonimbuk has 3 heritage-listed places on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.

Across 167 surveyed parcels in Tonimbuk, the median lot size is about 80,548 m². There are also 208 registered easements mapped in the suburb - an easement can restrict where you can build, so always check the title and overlays for the specific lot.

At the 2021 Census Tonimbuk had 229 usual residents, with a median age of 50 and an average household size of 2.6 people. The wider Bunyip - Garfield statistical area, which contains Tonimbuk, went from 7,445 people in 2001 to 10,366 in 2025, up 39%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Tonimbuk alone.

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Tonimbuk scores 1052 and sits in decile 9 of 10 nationally and decile 9 within Victoria - decile 1 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.

Median household income in Tonimbuk was $2,024 a week at the 2021 Census, against $1,976 for the typical suburb in Cardinia. Median rent was $260 a week and the median mortgage repayment $2,111 a month. These are 2021 Census figures and have not been indexed to today.

A Tonimbuk planning report pulls every overlay - zoning, flood, bushfire, heritage, environmental and noise - that touches a single lot, on live council and state data. The interactive map preview is free; the full PDF report is $9.