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

10.7 billion litres

10.3 billion litres
Dam storage levels N/A 51.2%
Monthly streamflow into dams N/A 0.55 billion litres
June rainfall to date 173.1mm (June average rainfall 1876-2016) 41.4mm
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 639 million litres per day – slightly below the demand forecast of 655 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)
16/06/2022 652  640
15/06/2022 620  640
14/06/2022 632  640
13/06/2022 648  665
12/06/2022 626  665
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 297.66 billion litres of water – which is 9.55 billion litres above the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels are slightly up on last week and are sitting at a combined 51.2 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 2022, the dams have received 1.7 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 177.1 billion litres. 

Sprinkler roster compliance

Since 1 January 2022, we have taken a total of 2,633 actions (warnings + fines) compared with 2,993 actions for the same period in 2021.

Annual rainfall

Perth has received 207.8mm of rainfall since 1 January 2022. The average (1876-2016) rainfall for the same period to the end of June is 375.9mm.

General water news

A friendly reminder the Winter Sprinkler Switch-Off is now in place, requiring scheme and bore water users in Perth, Peel, and parts of the South West and Great Southern to switch off their sprinklers between now and August 31.


By switching off your sprinklers when they’re needed less, we can collectively save around five billion litres of water this winter – enough to fill Optus Stadium five times.


Western Australians are generally pretty good at abiding by the Switch-Off, with our research showing nine out of 10 households do the right thing. To you, we say thank you.


So, with the rain well and truly here, there’s no better time to give the sprinklers a break and let the weather do the work. For more information, please visit here.