October water use to date

8 billion litres

8 billion litres

Dam storage levels


52 per cent

Weekly streamflow into dams


39 billion litres

October rainfall to date

38.7 mm

(October average rainfall 1994-2017)

5.64 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 last week was 759 million litres per day, which was above the forecast of 702 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 2019, we have used 64.6 billion litres of water – which is over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have remained stable this week and are sitting at a combined 51.9 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 38.8 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 but there’s no need to rush out and turn your sprinklers on as gardens are still getting plenty of water from rainfall.


Since 1 January 2019, we have taken a total of 6654 actions (warnings + fines) compared with 6646 actions for the same period in 2018.


Annual rainfall


Perth has received 547.64 mm of rainfall since 1 January 2019. The cumulative average (1994-2017) rainfall for the January to October period is 697.9 mm.


General water news


Our Drainage for Liveability team today rolled up their sleeves planting native trees to help give a functional drainage area in Mundaring an environmental makeover.


Staff teamed up with the Department of Biodiversity Conservation and Attractions (DBCA) to revegetate and restore habitat and bank stability of an area near Mundaring Weir.


We also recently worked with DBCA and students from Kiara College and John Forrest Secondary College to plant about 3500 trees to improve water quality of a drainage site near Grogan Swamp in Lockridge.


Through our Drainage for Liveability Program we are transforming functional stormwater drains into more liveable and greener areas for the community to enjoy.


For more: 

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555