Mount Vernon flood map & planning overlays
A planning-constraint profile of Mount Vernon
(Penrith, NSW) - 6.56 km², mapped from live council and
state overlay data. This suburb is moderately constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
6.56 km² - this suburb is moderately constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount Vernon's boundary, with the flood, bushfire and environmental overlays drawn on top. Amber hatching is the published aircraft noise (ANEF) contour. 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 Mount Vernon
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.
Inside an aircraft noise contour
65% of the suburb's land sits inside a published ANEF or airport-environs contour. Contours vary street by street, so whether a particular lot is inside one needs a property-level check.
Highest contour present
Under AS 2021, land between ANEF 25 and 30 is generally unacceptable for new houses; 20 to 25 is conditionally acceptable with noise attenuation. The contour is a forecast, not a measurement at any one house.
Contours held
- fairfield_anef_2023_20_25
- NSW planning (EPI) airport noise
Observed overflight - sampled 4 Sep to 26 Sep 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.
Mount Vernon at a glance
How Mount Vernon is zoned
Buying in Mount Vernon? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 6.56 km², Mount Vernon is moderately constrained by planning overlays. About 2% of the suburb sits within a mapped flood overlay, and 34% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is Environmental Living. The median lot measures about 10,171 m² across 353 parcels.
Who lives in Mount Vernon
Census 2021 figures published by the ABS for the Mount Vernon 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 1079, and decile 9 within New South Wales. The national average is 1000.
Age profile
Share of Mount Vernon's 1,235 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Horsley Park - Kemps Creek, the wider ABS statistical area containing Mount Vernon. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mount Vernon itself.
3,919 in 2001 to 4,146 in 2025, up 6%.
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.
Mount Vernon 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 | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Aircraft noise contours (ANEF) | Inside a held contour | NSW Government spatial services, NSW ePlanning and published council flood studies, 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 26 September 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 Mount Vernon 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 21% of Mount Vernon. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Published flood models are held over parts of Mount Vernon. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Mount Vernon lot.
See what's in the $9 report →Mount Vernon planning - frequently asked
Is Mount Vernon flood-prone?
About 2% of Mount Vernon falls within a mapped flood overlay, against the council-wide suburb average of 12%. Published flood models are held over parts of Mount Vernon; the free check on the Flood Model Report page says whether one reaches a given address.
Is Mount Vernon bushfire-prone?
Around 34% of Mount Vernon is mapped as bushfire-prone, compared with a Penrith average of 42%.
Is Mount Vernon affected by aircraft noise?
About 65% of Mount Vernon sits inside a published aircraft noise contour, and the highest contour present is ANEF 25 - under AS 2021, land above ANEF 25 is generally considered unacceptable for new houses, and 20-25 conditionally acceptable with noise attenuation. ANEF contours are forecasts published per airport and used to control noise-sensitive development; they are not a measurement at any one house, and a property can sit under a flight path and outside every contour.
Is Mount Vernon under a flight path?
Aircraft were observed below 3,000 ft over about 21% of Mount Vernon, and over about 82% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 26 Sep 2026). The lowest measured aircraft was at 500 ft, with an average of 5,500 ft. At the busiest point in the suburb about 2 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 Mount Vernon?
The dominant planning zone in Mount Vernon is Environmental Living, though the suburb also includes General Industrial and Private Recreation.
Does Mount Vernon have heritage-listed places?
Mount Vernon has 1 heritage-listed place on record.
What is the typical lot size in Mount Vernon?
Across 353 surveyed parcels in Mount Vernon, the median lot size is about 10,171 m². There are also 7 registered easements mapped in the suburb.
Does Mount Vernon have a train station?
There is no train station inside Mount Vernon itself. The suburb is served by 22 bus stops.
What is the population of Mount Vernon?
At the 2021 Census Mount Vernon had 1,235 usual residents, with a median age of 40 and an average household size of 3.8 people. The wider Horsley Park - Kemps Creek statistical area, which contains Mount Vernon, went from 3,919 people in 2001 to 4,146 in 2025, up 6%.
Is Mount Vernon an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Vernon scores 1079 and sits in decile 10 of 10 nationally and decile 9 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Mount Vernon?
Median household income in Mount Vernon was $3,177 a week at the 2021 Census, against $2,067 for the typical suburb in Penrith. Median rent was $495 a week and the median mortgage repayment $3,000 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Cecil Park Liverpool |
2.4 km | 23% | 74% |
| Kemps Creek | 2.5 km | 21% | 55% |
| Horsley Park Fairfield |
4.0 km | 13% | 48% |
| Cecil Hills Liverpool |
4.2 km | 6% | 58% |
| Abbotsbury Fairfield |
4.8 km | 5% | 70% |
| Elizabeth Hills Liverpool |
5.7 km | 37% | 42% |
| Erskine Park | 5.8 km | <1% | 22% |
| Badgerys Creek Liverpool |
6.4 km | 16% | 57% |
| Edensor Park Fairfield |
6.5 km | 13% | 1% |
| Bonnyrigg Heights Fairfield |
6.5 km | 3% | 1% |