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May water use to date

16 billion litres

17 billion litres

Dam storage levels


42 per cent

Weekly streamflow into dams


0 billion litres

May rainfall to date

88.7 mm

(May average rainfall 1994-2017)

32.2 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 past week was 775 million litres per day, which was above the forecast of 705 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 273 billion litres of water – which is 7.4 billion litres over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have dropped slightly this week and are sitting at a combined 42 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 0 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 2020, we have taken a total of 2494 actions (warnings + fines) compared with 3455 actions for the same period in 2019.



Annual rainfall


Perth has received 113.60 mm of rainfall since 1 January 2020. The average (1994-2017) rainfall for the same period is 176.6 mm.



General water news


Voting is now live!


Have your say and choose from three fantastic design concepts for the new waterwise demonstration garden near the Bassendean Community Men’s Shed.


The most popular design as voted by you will be used to transform road verge and land adjacent to Water Corporation's drainage basin on the corner of Railway Parade and May Holman Drive.


The waterwise garden will be used to educate and inspire the local community to embrace water efficiency outdoors.


To view the nature play, modern urban and modern rustic garden theme garden design concepts and to cast your vote before Tuesday 26 May, click here.

Media Enquiries:

Contact: Media team

Phone: 9420 2555