Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
April water use to date 24.9 billion litres
26.6 billion litres
Dam storage levels N/A 42.1%
Monthly streamflow into dams N/A 0 billion litres
April rainfall to date 44.2mm (April average rainfall 1876-2016) 40.6mm
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 863 million litres per day, which was above the forecast of 795 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)
30/04/2021 772 784
29/04/2021 850 784
28/04/2021 856 784
27/04/2021 931 784
26/04/2021 883 807
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 251.87 billion litres of water – which is 0.71 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 42.1 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 2,275 actions for the same period in 2020.

Annual rainfall

Perth has received 120.0mm 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

Do you know gubinge from youlk? The former is a sour plum-like fruit, while the latter is a root vegetable with a flavour somewhere between carrot and sweet eucalypt.


They are just some of WA’s diverse ‘bush tucker’ that has sustained Aboriginal people for thousands of years, while adapting over time to easily grow in our specific climate and soil.


Read more here about why now is the perfect time to enrich your backyard with WA’s unique waterwise blooms and flavours.