O'Sullivan Beach flood map & planning overlays
A planning-constraint profile of O'Sullivan Beach
(City of Onkaparinga, SA) - 1.88 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
1.88 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to O'Sullivan 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 O'Sullivan 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 6 a day
Night movements: observed, lowest 3,000 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.
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.
O'Sullivan Beach at a glance
How O'Sullivan Beach is zoned
Selling in O'Sullivan 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 1.88 km², O'Sullivan Beach is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 78% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is General Neighbourhood. The median lot measures about 655 m² across 1,142 parcels.
Who lives in O'Sullivan Beach
Census 2021 figures published by the ABS for the O'Sullivan 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 874, and decile 1 within South Australia. The national average is 1000.
Age profile
Share of O'Sullivan Beach's 1,844 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Christies Beach, the wider ABS statistical area containing O'Sullivan Beach. There is no annual population series published at suburb level, so this describes the surrounding area rather than O'Sullivan Beach itself.
9,995 in 2001 to 11,690 in 2025, up 17%.
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.
O'Sullivan 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 O'Sullivan 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.
Aircraft have been seen below 3,000 ft over about 18% of O'Sullivan Beach. 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 O'Sullivan Beach lot.
See what's in the $9 report →O'Sullivan Beach planning - frequently asked
Is O'Sullivan Beach flood-prone?
Flood mapping covers O'Sullivan Beach and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 4%).
Is O'Sullivan Beach bushfire-prone?
Around 78% of O'Sullivan Beach is mapped as bushfire-prone, compared with a City of Onkaparinga average of 69%.
Is O'Sullivan Beach under a flight path?
Aircraft were observed below 3,000 ft over about 18% of O'Sullivan Beach, and over about 85% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 4,000 ft. At the busiest point in the suburb about 17 aircraft a day were recorded passing over one 500 m square. 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 O'Sullivan Beach?
The dominant planning zone in O'Sullivan Beach is General Neighbourhood, though the suburb also includes Conservation and Infrastructure.
Does O'Sullivan Beach have heritage-listed places?
O'Sullivan Beach has 1 heritage-listed place on record.
What is the typical lot size in O'Sullivan Beach?
Across 1,142 surveyed parcels in O'Sullivan Beach, the median lot size is about 655 m².
Does O'Sullivan Beach have a train station?
There is no train station inside O'Sullivan Beach itself. The suburb is served by 15 bus stops.
What is the population of O'Sullivan Beach?
At the 2021 Census O'Sullivan Beach had 1,844 usual residents, with a median age of 44 and an average household size of 2.2 people. The wider Christies Beach statistical area, which contains O'Sullivan Beach, went from 9,995 people in 2001 to 11,690 in 2025, up 17%.
Is O'Sullivan Beach an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), O'Sullivan Beach scores 874 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 O'Sullivan Beach?
Median household income in O'Sullivan Beach was $1,072 a week at the 2021 Census, against $1,512 for the typical suburb in City of Onkaparinga. Median rent was $300 a week and the median mortgage repayment $1,200 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Christies Beach | 1.3 km | 0% | 37% |
| Christie Downs | 1.9 km | 0% | 0% |
| Lonsdale | 2.2 km | 0% | 47% |
| Noarlunga Centre | 2.8 km | 0% | 0% |
| Port Noarlunga | 3.5 km | 20% | 46% |
| Hackham West | 4.2 km | 0% | 0% |
| Noarlunga Downs | 4.7 km | 22% | 18% |
| Morphett Vale | 4.7 km | 2% | 25% |
| Port Noarlunga South | 4.8 km | 29% | 45% |
| Reynella | 5.0 km | <1% | 0% |