Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
March water use to date 18.2 billion litres
17.4 billion litres
Dam storage levels N/A 43.5%
Monthly streamflow into dams N/A 0 billion litres
March rainfall to date 19.5mm (March average rainfall 1876-2016) 39.4mm
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 948 million litres per day, which was above the forecast of 941 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)
19/03/2021 1,010 930
18/03/2021 970 930
17/03/2021 1,042  930
16/03/2021 959
15/03/2021 1,003  953
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 214.09 billion litres of water – which is 2.56 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 43.5 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 1,302 actions (warnings + fines) compared with 1,950 actions for the same period in 2020.

Annual rainfall

Perth has received 78.2mm of rainfall since 1 January 2021. The average (1994-2019) rainfall for the same period to the end of March is 51.6mm.

General water news

Calling all not-for-profit groups in the Kimberley! Next week, the latest round of our Kimberley Community Grants Scheme opens for applications.


Grants of up to $10,000 are available for projects that make a positive difference to lives and communities across the region.


The scheme is delivered by Water Corporation alongside the Lions Club of Broome. It is funded through the sale of Rhodes grass hay grown with recycled water from our Broome North Water Resource Recovery Facility.  


Applications open Monday, 22 March and close 5pm Friday, 14 May 2021. For more information, please visit here.