Williamstown flood map & planning overlays
A planning-constraint profile of Williamstown
(The Barossa Council, SA) - 69.23 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
69.23 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Williamstown'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 Williamstown
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: observed, lowest 5,000 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.
Williamstown at a glance
How Williamstown is zoned
Selling in Williamstown? 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 69.23 km², Williamstown is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 100% is flagged bushfire-prone. There are 26 heritage-listed sites on record, and the dominant land-use zone is Productive Rural Landscape. The median lot measures about 1,731 m² across 1,454 parcels.
Who lives in Williamstown
Census 2021 figures published by the ABS for the Williamstown 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 989, and decile 6 within South Australia. The national average is 1000.
Age profile
Share of Williamstown's 2,981 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Lyndoch, the wider ABS statistical area containing Williamstown. There is no annual population series published at suburb level, so this describes the surrounding area rather than Williamstown itself.
4,719 in 2001 to 6,981 in 2025, up 48%.
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.
Williamstown 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 Williamstown 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 42% of Williamstown. 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 Williamstown lot.
See what's in the $9 report →Williamstown planning - frequently asked
Is Williamstown flood-prone?
Flood mapping covers Williamstown and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 1%).
Is Williamstown bushfire-prone?
Around 100% of Williamstown is mapped as bushfire-prone, compared with a The Barossa Council average of 100%.
Is Williamstown under a flight path?
Aircraft were observed below 3,000 ft over about 42% of Williamstown, and over about 81% 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 1,000 ft, with an average of 3,000 ft. At the busiest point in the suburb about 9 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 Williamstown?
The dominant planning zone in Williamstown is Productive Rural Landscape, though the suburb also includes Rural and Rural Living.
Does Williamstown have heritage-listed places?
Williamstown has 26 heritage-listed places on record.
What is the typical lot size in Williamstown?
Across 1,454 surveyed parcels in Williamstown, the median lot size is about 1,731 m².
Does Williamstown have a train station?
There is no train station inside Williamstown itself. The suburb is served by 4 bus stops.
What is the population of Williamstown?
At the 2021 Census Williamstown had 2,981 usual residents, with a median age of 42 and an average household size of 2.7 people. The wider Lyndoch statistical area, which contains Williamstown, went from 4,719 people in 2001 to 6,981 in 2025, up 48%.
Is Williamstown an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Williamstown scores 989 and sits in decile 6 of 10 nationally and decile 6 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Williamstown?
Median household income in Williamstown was $1,782 a week at the 2021 Census, against $1,705 for the typical suburb in The Barossa Council. Median rent was $300 a week and the median mortgage repayment $1,500 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Cockatoo Valley | 6.0 km | 0% | 100% |
| Barossa Goldfields | 7.1 km | 0% | 100% |
| Altona | 7.7 km | 0% | 100% |
| Yattalunga City of Playford |
7.7 km | 0% | 100% |
| Lyndoch | 7.9 km | 0% | 100% |
| Pewsey Vale | 8.0 km | 0% | 100% |
| Sandy Creek | 8.7 km | 0% | 100% |
| Kersbrook Adelaide Hills Council |
9.0 km | 0% | 100% |
| Humbug Scrub City of Playford |
9.6 km | 0% | 100% |
| Kalbeeba | 9.8 km | 2% | 100% |