Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
March water use to date 11.6 billion litres
10.6 billion litres
Dam storage levels N/A 43.9 per cent
Monthly streamflow into dams N/A 0 billion litres
March rainfall to date 19.50 mm (March average rainfall 1876-2016) 39.20 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 892 million litres per day, which was below the forecast of 963 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)
12/03/2021 883 953
11/03/2021 941 953
10/03/2021 1005  953
09/03/2021 n/a  n/a
08/03/2021 943  975
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 207.44 billion litres of water – which is 2.63 billion litres below the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels have decreased slightly this week and are sitting at a combined 43.9 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 42.5 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 2021, we have taken a total of 1,200 actions (warnings + fines) compared with 1,833 actions for the same period in 2020.

Annual rainfall

Perth has received 78 mm of rainfall since 1 January 2021. The average (1994-2019) rainfall for the same period to the end of March is 51.6 mm.

General water news

Keen to learn more about Perth’s water sources and the innovative ways we’re helping secure WA’s water future? Why not check out Water Corporation’s Facebook page, which is full of informative videos and content to help increase your water IQ.


If you’re already one of our followers, you may have noticed a recent video featuring Water Corporation technical advisor Kendall Ferraro filmed on location at our Beenyup Water Resource Recovery Facility. Kendall takes you behind the scenes to show how water makes it way from your home to our treatment plant, and what happens once it arrives.


You can watch the video here, and for more great content from our digital team give Water Corporation’s Facebook page a follow. We’d love to have you on board!