Navigate home logo





July water use to date

1.8 billion litres

1.9 billion litres

Dam storage levels


44.2 per cent

Weekly streamflow into dams


2.2 billion litres

July rainfall to date

146.6 mm

(June average rainfall 1994-2017)

3 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 612 million litres per day, which was above the forecast of 584 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 1.22 billion litres of water – which is 0.03 billion litres over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have risen slightly this week and are sitting at a combined 44.2 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 2020 the dams have received 3.4 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 3315 actions (warnings + fines) compared with 4646 actions for the same period in 2019.


Annual rainfall


Perth has received 312.2 mm of rainfall since 1 January 2020. The average (1994-2017) rainfall for the same period is 389.2 mm (to the end of June).


General water news


Perth aims to be a leading waterwise city by 2030 and has reached a milestone towards achieving these plans. All 32 metropolitan local governments now participate in the Waterwise Council Program and 42 local governments across WA have been endorsed through the program.


The program encourages councils to adopt waterwise principals with free education resources, data loggers to assist with leak detection and access to greening scheme funding up to $10,000.


Waterwise Council water saving tips are available here