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October water use to date

13 billion litres

14 billion litres

Dam storage levels


52 per cent

Weekly streamflow into dams


41 billion litres

October rainfall to date

38.7 mm

(October average rainfall 1994-2017)

9.64 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 770 million litres per day, which was above the forecast of 732 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 70 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 51.7 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 6837 actions (warnings + fines) compared with 6766 actions for the same period in 2018.


Annual rainfall


Perth has received 551.64 mm of rainfall since 1 January 2019. The cumulative average (1994-2017) rainfall for the January to October period is 697.9 mm.


General water news


Monday marks the start of National Water Week. With this year’s theme being ‘It’s time to change the world’ we are encouraging everyone to take small steps to become more waterwise and make the world a better place for generations to come.


September in Perth was the hottest on record and driest in more than four decades. With this trend expected to continue for the rest of the year, we urge everyone to consider how they can help save precious water, especially in the lead up to summer.


So far this year, Perth’s dams have received just 41 billion litres of streamflow from rain compared to the pre-1975 average of 420 billion litres a year.


To find out ways you can take small steps to help save water, visit

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555