Target Actual
January water use to date 15.7 billion litres
16.8 billion litres
Dam storage levels N/A 46.6 per cent
Monthly streamflow into dams N/A 0.7 billion litres
January rainfall to date 9.7 mm (January average rainfall 1876-2016) 0.0 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 1,117 million litres per day, which was above the forecast of 1,049 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)
15/01/2021 1,105 1,051
14/01/2021 1,121 1,051
13/01/2021 1,070 1,051
12/01/2021 1,058 1,051
11/01/2021 1,089 1,047
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2020, we have used 152.23 billion litres of water – which is 0.84 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 46.6 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 42.5 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 175.79 billion litres.

Sprinkler roster compliance

Since 1 January 2021, we have taken a total of 388 actions (warnings + fines) compared with 526 actions for the same period in 2020.

Annual rainfall

Perth has received 0.00 mm of rainfall since 1 January 2021. The average (1994-2019) rainfall for the same period to the end of January is 19.7 mm.

General water news

Have you heard about Water Corporation’s Splash of Colour program? Since 2017, the program has transformed over 50 operational assets – things like pump stations and electrical cabinets –into vibrant public murals.


This week we announced completion of our latest Splash project in Scarborough. Noongar artist Seantelle Walsh teamed with students from Scarborough Primary School to design the striking piece, which adorns an electrical cabinet in what was once vacant land along Brighton Road.


With help of nearby residents and the City of Stirling, Water Corporation has transformed the previously empty lot into a bush garden for the whole community to enjoy. This part of the project was funded through our Drainage for Liveability program. Since 2016, the Drainage for Liveability Program has transformed 17 sites across WA, delivering better community and environmental outcomes.