The Water Corporation is urging households to switch off reticulation systems before the winter sprinkler ban after recent rain and forecasts of more downpours.
The call from the State-owned utility came as it released figures showing there had been a 15 per cent jump in the number of customers fined for flouting sprinkler restrictions in the past year.
The Water Corp said that between July 1 last year and May 19, it had issued 1820 infringements, each for $100, to households caught using sprinklers outside of their rostered days.
The utility handed out 1569 infringements for the 2012-13 financial year.
A spokeswoman said the two-day-a-week sprinkler roster, introduced in 2001 to prop up Perth's drinking supplies, saved up to 54 billion litres a year. Even though the winter sprinkler ban was not due for another 10 days, she urged households to turn their systems off early.