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July water use to date

3 billion litres

3 billion litres

Dam storage levels


46 per cent

Weekly streamflow into dams


2 billion litres

July rainfall to date

146.6 mm

(July average rainfall 1994-2017)

53.80 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 601 million litres per day, which was above the forecast of 572 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 2.4 billion litres of water – this is 0.1 billion litres above what we had forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have remained stable this week and is sitting at 46 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 4.5 billion litres of streamflow.  The post-1975 average for the May to April period (called the streamflow year) is 187.2 billion litres.


Sprinkler roster compliance


The Winter Sprinkler Switch-off is now in place.  This means you need to ensure your sprinklers are kept switched off until the end of winter.


Our team of inspectors issued 124 warnings and 16 fines this week.  Since 1 January 2019, we have taken a total of 4646 actions (warnings + fines) compared with 4995 actions for the same period in 2018.


Annual rainfall


Perth has received 341.4 mm of rainfall since 1 January 2019.  The cumulative average (1994-2017) rainfall for the January to July period is 450.1 mm.


General water news


Congratulations Lake Joondalup Baptist College who celebrated 20 years of taking part in the Water Corporation’s Waterwise Schools Program at a special assembly this week.


Over the past two decades, teachers at the school have been educating students on the need to value, protect and conserve water resources.



Media Enquiries:

Contact: Clare Lugar

Position: Manager Media and Strategic Communications

Phone: (08) 9420 2555