Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
November water use to date 3.9 billion litres
3.4 billion litres
Dam storage levels N/A 49.6 per cent
Monthly streamflow into dams N/A 0.08 billion litres
December rainfall to date 13.1 mm (December average rainfall 1876-2016) 0.40 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 858 million litres per day, which was below the forecast of 960 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)
04/12/2020 917 970
03/12/2020 899 970
02/12/2020 848 970
01/12/2020 752 970
30/11/2020 845 945
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 107.56 billion litres of water – which is 2.55 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 49.6 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 42.2 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 2020, we have taken a total of 5,300 actions (warnings + fines) compared with 8,642 actions for the same period in 2019.

Annual rainfall

Perth has received 673.8mm of rainfall since 1 January 2020. The average (1994-2019) rainfall for the same period to the end of November is 727.2mm.

General water news

Did you see our announcement this week about a new pipeline to support housing growth in Perth's southern suburbs?


As part of our on-going commitment to future-proof Perth's water supply, Water Corporation is investing $158.7 million in metropolitan water projects in 2020-21 that will ensure a reliable supply of fresh drinking water to Perth homes and businesses. 


The completion of a 1.7 kilometre pipeline between Yangebup and Beeliar is just one of many projects supporting our growing customer base. To find out more, click here