Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
April water use to date 19.4 billion litres
20.4 billion litres
Dam storage levels N/A 42.2%
Monthly streamflow into dams N/A 0 billion litres
April rainfall to date 44.2mm (April average rainfall 1876-2016) 23.2mm
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 861 million litres per day, which was above the forecast of 818 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)
23/04/2021 872 807
22/04/2021 889 807
21/04/2021 847 807
20/04/2021 839 807
19/04/2021 924 831
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 242.36 billion litres of water – which is 1.43 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 42.2 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 175.73 billion litres.

Sprinkler roster compliance

Since 1 January 2021, we have taken a total of 1,782 actions (warnings + fines) compared with 2,228 actions for the same period in 2020.

Annual rainfall

Perth has received 102.6mm of rainfall since 1 January 2021. The average (1994-2019) rainfall for the same period to the end of April is 88.4mm.

General water news

This week, the McGowan Government announced electricity and water financial relief packages to support those affected by the devastating impacts of ex-tropical cyclone Seroja.


If you are or know anyone who has been directly impacted by the cyclone, financial assistance is now available to help our customers get back on their feet.


To find out more, please visit: