One of the State's most respected water experts has labelled the way WA people use drinking supplies as "crazy", saying too much is wasted and attitudes need to change.
Jim Gill, the former long-serving head of the Water Corporation, said the average person in WA used about 300 litres of scheme water a day but suggested much of this was squandered.
Amid plans by the major political parties to build recycling and desalinations plants, Dr Gill said technology ensured there was no risk Perth would run out of water even if it rained less.
However, he said it was imperative households came to grips with consuming, particularly given water's spiralling cost on the back of increased desalination capacity.
"The other thing that we have to do, I think, is use less water," Dr Gill told ABC radio.
"How many people . . . clean their teeth with the tap running or run a tap in the kitchen just to rinse their dishes as they're washing them in the sink or spend 10 minutes under the shower and all that sort of stuff?
"I mean we're crazy the way we use water. It used to be 300 litres per day per person when I was in the game (between 1995 and 2008).
"It may be a little less than that now, I hope it is, but that's four times my body weight . . . every day, every person just for doing things like that, for flushing loos too often and having bigger gardens than we need."
A Water Corporation spokeswoman did not respond directly to Dr Gill's remarks but noted that per capita consumption had fallen almost 30 per cent over the past 10 years.
Over the same time Perth's population had increased by almost a third, she said.
The spokeswoman said people were using less because of corporation schemes such as its showerhead swap program.
"We agree there is always more we can do," she said.
This included encouraging people to plant gardens better adapted to Perth's climate."Although summer has ended, Perth's warm weather generally continues well into March and April and we ask that residents remain vigilant of the water they use during this time," she said.
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