Relentless urban sprawl in the harbour city is swallowing farms on the city's fringes so quickly produce from the Sydney Basin will be almost non-existent within 15 years.
Farms in the Sydney Basin currently produce 20 per cent of the city's food needs, however, researchers at the University of Technology Sydney (UTS) are forecasting that number to fall sharply.
Laura Wynne, a senior research consultant at the UTS Institute for Sustainable Futures, said the figure was expected to fall to 6 per cent by 2031.
"At the moment the future looks dire in terms of food production in the Sydney Basin if changes aren't made," Ms Wynne said.
Sydney's population is set grow by 1.6 million people in the 20 years between 2014 and 2034.
Of that, 900,000 people will settle in the city's western suburbs.
Ms Wynne warned of the downside of "paving over the land".
"A lot of the concern is around the liveability of our cities, clean air and water, the cooling effect and also supporting biodiversity," Ms Wynne said.
Farms out, houses in
The most recent Australian Bureau of Statistics (ABS) figures revealed western Sydney population increased by more than 770,000 people in the decade to 2016.
And the harbour city is in the midst of its largest ever housing construction boom, with the New South Wales Government focussing on housing supply as a means of combating affordability issues.
The Department of Planning and Environment's latest figures predict almost 200,000 new homes will be built in greater Sydney in the next five years.
That number represents a 46 per cent increase on the previous five years, when 134,700 new homes were constructed.
Western Sydney farmer George Kelman, 77, has seen the area change.
"There were farms everywhere you know; now it's full of houses," he said.
"There'll be a lot development here in the next few years. It will like driving through the eastern suburbs."
The Kelman family's horticulture business supplies farmers markets in Sydney.
"When you go to the markets you can see it — the amount of farmers that are at the market versus the agents from interstate — it's getting less," Mr Kelman's daughter Christina said.
The family have two farms, one in Kemps Creek and the other in Wallacia, and a warehouse not far from Sydney's planned second airport at Badgerys Creek, which is set to open in 2026.
Demand for land in that area has soared and the Kelmans said they would consider selling their Kemps Creek farm in the future.
The Department of Primary Industries' (DPI) most recent Status of Sydney's Agriculture report estimated in 2016 there were approximately 2210 farms in greater Sydney, employing 7000 people over 125,000 hectares of land.
The DPI estimated the value of its food production to be $780 million a year, with poultry and vegetables major contributors.