Navigate home logo




July water use to date

14.3 billion litres

14.5 billion litres

Dam storage levels


45 per cent

Weekly streamflow into dams


2.3 billion litres

July rainfall to date

145.3 mm

(July average rainfall 1994-2017)

68 mm

Note: 1 billion litres = approx. 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 583 million litres per day, which was below the forecast of 592 million litres.


Daily water use for the last five days


Actual water use (million litres)

Forecast (million litres)
















Note: water use is calculated up to 8am each day for the previous 24 hour period


Since 1 July 2020, we have used 13.5 billion litres of water – which is 0.18 billion litres under the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels are unchanged this week and are sitting at a combined 45 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 7.5 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 3686 actions (warnings + fines) compared with 5243 actions for the same period in 2019.


Annual rainfall


Perth has received 382.6 mm of rainfall since 1 January 2020. The average (1994-2017) rainfall for the same period is 396.2mm (to the end of July).  



General water news


It’s been a busy week at Water Corporation HQ with the launch of two exciting new projects.


In case you missed it, we’re working with the City of Stirling and local residents to transform a disused Scarborough site into a community bush garden! This is a project we’ve been looking forward to for a long time, and once completed, will provide a green, inviting space for the community to enjoy. Stay tuned for more updates as construction progresses, including news on a special Splash of Colour project we’re planning on the site.


Learn more about the Brighton Road Community Bush Garden here.


Construction is officially under way on the Denmark Pipeline – a project to secure the town’s future water security by connecting it to the Lower Great Southern Town Water Supply Scheme. Local contractors are among those to benefit from the $25 million project, which will see $4.8 million directly invested into the Great Southern and create 50 local jobs. Check out progress here.

We finished the week by announcing completion of a $1.6 million upgrade to Carnarvon’s Brown Range water tanks. Upgrades include state-of-the-art remote monitoring technology which reduce the potential for local supply interruptions during cyclones and other extreme weather events.