Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
August water use to date

7.6 billion litres

8.1 billion litres
Dam storage levels N/A 57.7%
Monthly streamflow into dams N/A 27.57 billion litres
August rainfall to date 132.90 mm (August average rainfall 1876-2016) 32.20 mm
Note: 1 billion litres = approximately 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 617 million litres per day – above the demand forecast of 587 million litres per day.

Daily water use for the last 5 days

Table showing daily water use for the last 5 days
Date Actual water use (million litres) Forecast water use (million litres)
13/08/2021 615 588
12/08/2021 613 588
11/08/2021 600 588
10/08/2021 622 588
09/08/2021 653 584
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2021, we have used 26.73 billion litres of water – which is 1.27 billion litres above the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels are slightly up on last week and are sitting at a combined 57.7 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 2021, the dams have received 78.6 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 175.59 billion litres.

Sprinkler roster compliance

From 1 January to 9 July 2021, we have taken a total of 4,188 actions (warnings + fines) compared with 4,041 actions for the same period in 2020.

Annual rainfall

Perth has received 631 mm of rainfall since 1 January 2021. The average (1876-2016) rainfall for the same period to the end of August is 676.5mm.

General water news

This week Water Corporation reaffirmed its commitment to supporting women and children escaping family and domestic violence by providing another $150,000 to the Funds for Freedom Program.


The Funds for Freedom Program is coordinated by the Centre for Women’s Safety and Wellbeing and provides much-needed grants of up to $750 to help women re-establish a new home for themselves and their children by assisting in the purchase of white goods.


Water Corporation has supported Funds for Freedom since 2018, with more than 286 women and 489 children supported through the purchase of 101 washing machines, 124 fridges, 44 security devices and various other household items.


Water Corporation is committed to supporting individuals experiencing domestic and family violence, and now has a permanent family violence policy in place to better support and protect survivors of family violence, including those who may be experiencing financial hardship.


To download Water Corporation’s family violence policy or to find out more about how we’re supporting our customers, visit