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November water use to date

1 billion litres

1 billion litres

Dam storage levels


51 per cent

Weekly streamflow into dams


41 billion litres

November rainfall to date

23.2 mm

(November average rainfall 1994-2017)

5 mm

Note: 1 billion litres = approx. 400 Olympic swimming pools. Please note the figures in this table are rounded (except for rainfall) to the nearest whole number.













Water use


Average water use over the last week was 821 million litres per day, which was above the forecast of 797 million litres.


Daily water use for the last five days


Actual water use (million litres)

Forecast (million litres)
















Note: water use is calculated up to 8am each day for the previous 24 hour period


Since 1 July 2019, we have used 81.5 billion litres of water – which is over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have remained stable this week and are sitting at a combined 51.3 per cent* of full capacity.


*Please note some dams are filled from different sources - dam levels include the transfer of groundwater and desalinated seawater from treatment plants as well as streamflow (that comes from rainfall).  As we use many different sources of water, dams are no longer an accurate indicator of the health of Perth's overall water supply situation.


Streamflow (total for 15 dams)


From 1 May 2019 the dams have received 41 billion litres of streamflow.  The post-1975 average for the May to April period (called the streamflow year) is 183.9 billion litres.


Sprinkler roster compliance


The two-day a week sprinkler roster now applies. Since 1 January 2019, we have taken a total of 7336 actions (warnings + fines) compared with 7061 actions for the same period in 2018.


Annual rainfall


Perth has received 567.64 mm of rainfall since 1 January 2019. The cumulative average (1994-2017) rainfall for the January to November period is 721.1 mm.


General water news


The rain this week has been welcome but with the Bureau of Meteorology forecasting below average rainfall across most of Australia throughout November and December we encourage everyone to do their bit to save precious water.


The Bureau also predicts warmer than average temperatures are likely for November through to January next year.


To find out simple ways you can help save water inside your home and out in the garden, view our water saving tips page: 

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555