Navigate home logo
Table showing target and actual water use, dam levels, streamflow and rainfall
  Target Actual
October water use to date 1.4 billion litres 1.4 billion litres
Dam storage levels NA 50.7 per cent
Monthly streamflow into dams N/A 0 billion litres
October rainfall to date 51.5 mm (Oct average rainfall 1876-2016) 2.4 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 656 million litres per day, which was below the forecast of 692 million litres.

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)
02/10/2020 664 703
01/10/2020 660 703
30/092020 645 703
29/09/2020 661 703
28/09/2020  635 676
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 56.64 billion litres of water – which is 0.42 billion litres under the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels have risen slightly this week and are sitting at a combined 50.7 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 2020 the dams have received 34.7 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 176.73 billion litres.

Sprinkler roster compliance

Since 1 January 2020, we have taken a total of 4460 actions (warnings + fines) compared with 6527 actions for the same period in 2019.

Annual rainfall

Perth has received 571 mm of rainfall since 1 January 2020. The average (1994-2019) rainfall for the same period to the end of October is 694.1 mm.

General water news

This week we released our 2020 Annual Report, which provides our customers, community and stakeholders with information about our financial performance and contribution to the State’s economy for the 2019-20 financial year.


Highlighted this year is our continued effort to safeguard water supplies in response to climate change, which includes doubling the water recycling capacity of our Groundwater Replenishment Scheme to 28 billion litres per year.


In addition to this, we have saved around two billion litres of water through our residential demand delivery programs, and all of Perth-Peel local governments are participating in our Waterwise Council Program.


This year we also boosted financial support to customers in response to COVID-19. While we have always offered extensive support for customers experiencing difficulty paying their bill, we expanded our assistance measures and provided wastewater charge relief for eligible Water Corporation businesses through the Major Fixtures Waiver.


To read the full report or to find out more about our performance and achievements this year, visit .