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Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
March water use to date

16.4 billion litres

17.9 billion litres
Dam storage levels N/A 52.4%
Monthly streamflow into dams N/A 0 billion litres
March rainfall to date 19.5mm (March average rainfall 1876-2016) 2.0mm
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 1,058 million litres per day – above the demand forecast of 948 million litres per day.

Daily water use for the last five days

Table showing daily water use for the last 5 days
Date Actual water use (million litres) Forecast water use (million litres)
17/03/2022 1,090 938
16/03/2022 913 938
15/03/2022 1,076 938
14/03/2022 1,115 960
13/03/2022 1,019 960
Note: water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2021 to date, we have used 225.4 billion litres of water – which is 9.10 billion litres above the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels are slightly down on last week and are sitting at a combined 52.4 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 2021, the dams have received 138.7 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 177.5 billion litres. 

Annual rainfall

Perth has received 3.6mm of rainfall since 1 January 2022. The average (1876-2016) rainfall for the same period to the end of March is 41.7mm.

General water news

Did you know 1 in 5 households have a water leak? World Plumbing Day celebrated in March is a great reminder to check for hidden leaks in your home or business to help save water.


You can perform a basic leak test in just 15 minutes with Water Corporation’s easy online leak detection tool.


If you identify an invisible leak in your home and have it repaired by a licensed plumber, you may be eligible for a leak allowance. This is a refund based on the water lost due to the undetected leak.


For more information about leak allowances, eligibility, or how to apply, visit our leak allowance advice article.