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September water use to date

4 billion litres

4 billion litres

Dam storage levels


51 per cent

Weekly streamflow into dams


28 billion litres

September rainfall to date

87 mm

(August average rainfall 1994-2017)

18.6 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 593 million litres per day, which was above the forecast of 590 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 39.7 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 51.1 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 28.2 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 summer sprinkler roster now applies but there’s no need to rush out and turn your sprinklers on as gardens are still getting plenty of water from rainfall.


Since 1 January 2019, we have taken a total of 6081 actions (warnings + fines) compared with 6198 actions for the same period in 2018.


Annual rainfall


Perth has received 529.2 mm of rainfall since 1 January 2019. The cumulative average (1994-2017) rainfall for the January to September period is 659.2 mm.


General water news


You can now significantly reduce your water use in the garden and help save precious water with rebates now available for waterwise weather smart irrigation controllers.


You can get a $200 rebate on the purchase and installation of a weather smart irrigation controller that uses local weather data to adjust sprinkler watering times.


It works by detecting if it has rained or is about to rain, and adjusts your garden's sprinklers accordingly to reduce over-watering.


With up to 40 per cent of all household water use being used outdoors in the garden, it’s an easy way for Perth households to save water.


For more information, go to

Media Enquiries:

Contact: Rebecca Horton

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555