May water use to date

7.4 billion litres

7.7 billion litres

Dam storage levels



Flow into dams

(May – December 2017)

25 billion litres

94 billion litres

May rainfall to date


(monthly average)


Note: 1 billion litres = approx. 400 Olympic swimming pools



Water use


Average daily water use over the last week was 775 million litres, which was above the forecast of 740 million litres.  Since 1 July 2017 we have used 250.47 billion litres of water, which is about 9 billion litres below the 259.5 billion litres we had forecast.


Dam levels


Over the last seven days, Perth’s dam storage levels have slightly fallen from 136.9 billion litres to 136.2 billion litres of usable storage. Perth’s dams store water from three different sources… groundwater and desalinated seawater transferred from treatment plants as well as streamflow (produced by rainfall).


Sprinkler roster compliance


The two-day-per week sprinkler roster now applies, and our inspectors issued 98 warnings and 51 fines last week.  Since 1 January 2018 we have taken a total of 3,741 actions (warnings + fines) compared with 4,237 actions for the same period in 2017.




Perth has received 6.2mm of rainfall so far this May - the average rainfall in Perth for May is 116.9mm. Since 1 January 2018, Perth has received 135.8mm of rainfall – cumulative average rainfall from January to May is 202.8mm.


Take advantage of our Waterwise irrigation Controller Offer – three weeks to go!


For those in Perth who would like to set and forget their irrigation, a weather based irrigation controller does the work for you and automatically adjusts its run times according to the weather.


The Waterwise Irrigation Controller Offer allows households to receive a 50 per cent discount (maximum of $350) on a weather based irrigation controller. So far, 353 households have taken part in the offer – with only three weeks to go, take part today! 

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