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September water use to date

2.5 billion litres

2.5 billion litres

Dam storage levels


48.4 per cent

Monthly streamflow into dams


0.44 billion litres

September rainfall to date

82.9 mm

(September average rainfall 1994-2019)

21.6 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 past week was 616 million litres per day, which was above the forecast of 611 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 2020 to date, we have used 37.04 billion litres of water – which is 0.38 billion litres under the forecast target for this period.

Dam level (total for 15 dams)


The dam storage levels have remained unchanged this week and are sitting at a combined 48.4 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 2020 the dams have received 21.5 billion litres of streamflow.  The post-1975 average for the May to April period (called the streamflow year) is 176.06 billion litres.


Sprinkler roster compliance


Since 1 January 2020, we have taken a total of 4270 actions (warnings + fines) compared with 6081 actions for the same period in 2019.


Annual rainfall


Perth has received 511.8mm of rainfall since 1 January 2020. The average (1994-2019) rainfall for the same period to the end of September is 656.2 mm.


General water news

Do you know how much water a seemingly innocuous leak can actually waste? For constant trickle in the toilet bowl, it could be as much as 9,000 litres a year which is the same as 155 bath tubs of water!


So, consider this your mid-year reminder to pull out your life admin list and tick off “check for leaks”. Each year the equivalent of around 700 million buckets of water is lost through residential leaks in Perth alone!


You can find out more about leaks, and even find out if your home might have a water leak, by using Water Corporation’s handy Leak Detection Tool.