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November water use to date

19 billion litres

20 billion litres

Dam storage levels


50 per cent

Weekly streamflow into dams


44 billion litres

November rainfall to date

23.2 mm

(November average rainfall 1994-2017)

17.8 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 951 million litres per day, which was above the forecast of 894 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 99.91 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 50.2 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 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 2019, we have taken a total of 8101 actions (warnings + fines) compared with 7636 actions for the same period in 2018.


Annual rainfall


Perth has received 580.04 mm of rainfall since 1 January 2019. The cumulative average (1994-2017) rainfall for the January to November period is 721.1 mm.


General water news


Did you know 4.2 billion people around the world live without safely managed sanitation?!


Tuesday was World Toilet Day and this year’s theme was ‘Leaving no one behind’.


With Water Corporation managing just over 17,000 kilometres of wastewater mains throughout the state, we are encouraging the community to not take this important infrastructure for granted and to help look after it.


This means thinking before you flush as items like socks, jocks, wet wipes, nappies and plastic bags do not break down like toilet paper and can cause havoc in local wastewater systems.


It’s also important to not pour fat, oil or grease straight down the kitchen sink as once cooled it solidifies and causes blockages.


It’s easy to remember – only soap and water down the sink, and paper, pee and poo down the loo.


To find out more, watch our education campaign about the ‘monster’ that forms in the wastewater system, which is fed by the likes of fat, oil, grease and wet wipes.

Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555