Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
March water use to date 23.6 billion litres
23.6 billion litres
Dam storage levels N/A 43 per cent
Monthly streamflow into dams N/A 0 billion litres
March rainfall to date 19.5 mm (March average rainfall 1876-2016) 39.4 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 999 million litres per day, which was above the forecast of 917 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)
26/03/2021 947 906
25/03/2021 976 906
24/03/2021 837 906
23/03/2021 945
22/03/2021 1,115 930
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 221.1 billion litres of water – which is 1.97 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 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 1,420 actions (warnings + fines) compared with 2,031 actions for the same period in 2020.

Annual rainfall

Perth has received 78.2 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

Water Corporation’s Community Choice Awards are a great opportunity to recognise WA’s waterwise councils for their commitment to sustainably managing and improving the amenity of public green spaces such as parks, verges, and median strips.


The awards are back for 2021, and now is the time to vote for your favourite waterwise project. Six local governments have been nominated this year, including:

You are only able to vote for one project, so we encourage you to have a look at all projects before casting your final vote! Voting closes 5pm Sunday 18 April 2021.


To view all projects and vote for your favourite, click here.