November water use to date

13 billion litres

13 billion litres

Dam storage levels


51 per cent

Weekly streamflow into dams


43 billion litres

November rainfall to date

23.2 mm

(November average rainfall 1994-2017)

17.6 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 965 million litres per day, which was above the forecast of 862 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 93.7 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 50.6 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 2019 the dams have received 43.1 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 7734 actions (warnings + fines) compared with 7636 actions for the same period in 2018.


Annual rainfall


Perth has received 579.84 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


Very hot and sunny days like Perth has experienced recently can cause water in backyard pools to evaporate much faster than you might think.


To help save precious water, and money, don’t forget to use a pool cover when you’re not using your pool.


For other little things you can do to help save water inside and outside your home, visit our water saving tips page: 


Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555