Concerns have been raised by Western Australia's A$5.5 billion food and beverage manufacturing sector over a current crisis in the supply of gas in the region.

The short supply is the result of a gas explosion earlier in the month on Varanus Island, home to Apache Energy's gas processing plant.

The Food Industry Association of WA said this week that the current gas supply crisis will cause both immediate and permanent damage to the industry, resulting in a loss of jobs, threats to the State's food supply, and potential jeopardy to important interstate and export markets.

FIA chief executive officer, Andrea Berteit, said she had met with the Premier's advisor and briefed him on increasingly dire circumstances being confronted by her members.

"We're now ringing alarm bells because the problem is getting more serious by the day. Even though our members are trying to do the right thing, the current situation cannot be sustained.

"Where possible, they've switched to other, more expensive fuels, rescheduled operations to non-peak energy periods, reduced production through maintenance shutdowns, and asked staff to take annual leave. Several have already closed their doors, the latest being Vesco Foods which has halted operations for at least a week," she said.

"A major industry concern is Alinta's rotational gas supply strategy to cope with the gas loss, which gives 12 hours notice of supply reductions or withdrawals. This strategy is unworkable in respect of raw and semi-processed foodstuff and beverage manufacturing.

"At a minimum we certainly need this notice period extended and expanded to a week's forecast, while other available gas supplies need to be reallocated into priority areas such as food production."

She said that while there was already a shortage of milk in WA, the current 12-hour notice period could see a million litres of milk a day poured down the drain.

"The inability to process food and the daily uncertainty about gas supplies was also impacting on people who feared for their jobs whilst essential products were becoming unavailable for the food service sector," she said.

Berteit said that the customers of Alinta Gas were the most affected by the four-week old crisis which had cut supplies by 30%.

"We have proposed to the government to consider an urgent reallocation of gas between the suppliers to ensure critical areas such as food and beverage production had a minimum and more predictability energy supply," Berteit said.

Products are being brought in from the Eastern States and overseas to make up the State's shortfall caused by food and beverage manufacturing being substantially reduced over the last three weeks, the FIA said.