Thompson Beach flood map & planning overlays
A planning-constraint profile of Thompson Beach
(Adelaide Plains Council, SA) - 4.33 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
4.33 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Thompson Beach's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Thompson Beach
Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.
Observed overflight - sampled 4 Sep to 3 Oct 2026
typical observed square 1 a day
Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude either way.
Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.
Thompson Beach at a glance
How Thompson Beach is zoned
Selling in Thompson Beach? The zone and overlays on this page are the Planning and Design Code controls a Form 1 vendor's statement has to disclose.
Across its 4.33 km², Thompson Beach is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 24% is flagged bushfire-prone. The dominant land-use zone is Coastal Waters and Offshore Islands. The median lot measures about 952 m² across 347 parcels.
Who lives in Thompson Beach
Census 2021 figures published by the ABS for the Thompson Beach suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 864, and decile 1 within South Australia. The national average is 1000.
Age profile
Share of Thompson Beach's 219 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Mallala, the wider ABS statistical area containing Thompson Beach. There is no annual population series published at suburb level, so this describes the surrounding area rather than Thompson Beach itself.
2,897 in 2001 to 3,561 in 2025, up 23%.
Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.
Thompson Beach data sources and coverage
“Not mapped” means we hold no source layer for this suburb - never an all-clear.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Bushfire-prone mapping | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Zoning | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Heritage and environment | Mapped where published | the South Australian Planning and Design Code and Location SA spatial data |
| Aircraft noise contours (ANEF) | Not held | the South Australian Planning and Design Code and Location SA spatial data, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 3 October 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific Thompson Beach address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Thompson Beach lot.
See what's in the $9 report →Thompson Beach planning - frequently asked
Is Thompson Beach flood-prone?
Flood mapping covers Thompson Beach and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 14%).
Is Thompson Beach bushfire-prone?
Around 24% of Thompson Beach is mapped as bushfire-prone, compared with a Adelaide Plains Council average of 81%.
Is Thompson Beach under a flight path?
Aircraft were observed over about 18% of Thompson Beach in the period sampled, but only above 3,000 ft - the lowest measured was 500 ft. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.
What is the zoning in Thompson Beach?
The dominant planning zone in Thompson Beach is Coastal Waters and Offshore Islands, though the suburb also includes Rural Settlement and Conservation.
Does Thompson Beach have heritage-listed places?
No heritage-listed places are on record within Thompson Beach.
What is the typical lot size in Thompson Beach?
Across 347 surveyed parcels in Thompson Beach, the median lot size is about 952 m².
What is the population of Thompson Beach?
At the 2021 Census Thompson Beach had 219 usual residents, with a median age of 52 and an average household size of 1.8 people. The wider Mallala statistical area, which contains Thompson Beach, went from 2,897 people in 2001 to 3,561 in 2025, up 23%.
Is Thompson Beach an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Thompson Beach scores 864 and sits in decile 1 of 10 nationally and decile 1 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Thompson Beach?
Median household income in Thompson Beach was $1,013 a week at the 2021 Census, against $1,552 for the typical suburb in Adelaide Plains Council. Median rent was $253 a week and the median mortgage repayment $1,018 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Webb Beach | 4.8 km | 0% | 11% |
| Parham | 6.6 km | 0% | 30% |
| Dublin | 7.1 km | 0% | 97% |
| Windsor | 9.1 km | 0% | 89% |
| Lower Light | 9.7 km | 32% | 71% |
| Wild Horse Plains | 15.2 km | 0% | 80% |
| Calomba | 16.0 km | 0% | 100% |
| Long Plains | 16.8 km | 0% | 100% |
| Middle Beach | 19.3 km | 34% | 66% |
| Mallala | 21.4 km | 4% | 100% |