Table showing target and actual water use, dam levels, streamflow and rainfall
  Target Actual
March water use to date 13 billion litres 12 billion litres
Dam storage levels NA 44%
Weekly streamflow into dams NA 44 billion litres
March rainfall to date 21.0mm (Feb average rainfall 1994-2017) 0.00mm
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 981 million litres per day, which was above the forecast of 964 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)
13/03/2020 955 954
12/03/2020 1009 954
11/03/2020 1017 954
10/03/2020 987 954
9/03/2020 1052 977
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2019, we have used 214.8 billion litres of water – which is around 5.5 billion litres over the forecast for this period

Dam level (total for 15 dams)

The dam storage levels have dropped 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 2019 the dams have received 44.1 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 183.9 billion litres.

Sprinkler roster compliance

The two-day a week sprinkler roster now applies. Since 1 January 2020, we have taken a total of 1833 actions (warnings + fines) compared with 2560 actions for the same period in 2019.

Annual rainfall

Perth has received 37.40 mm of rainfall since 1 January 2019. The average (1994-2017) rainfall for the March period is 50.7 mm.

General water news

Looking for a waterwise specialist?

Our unique Waterwise Products and Services Program helps you to save water in the home and garden.

They can help you with landscaping, irrigation and household plumbing maintenance and installation to ensure you are using water efficiently around your home.

To search for a Water Corporation endorsed waterwise specialist, visit

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555