Table showing target and actual water use, dam levels, streamflow and rainfall
Target Actual
July water use to date

13.7 billion litres

14.5 billion litres
Dam storage levels N/A 48.5%
Monthly streamflow into dams N/A 22.8 billion litres
July rainfall to date 167.70 mm (July average rainfall 1876-2016) 212.80 mm
Note: 1 billion litres = approximately 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 613 million litres per day – above the demand forecast of 591 million litres per day.

Daily water use for the last 5 days

Table showing daily water use for the last 5 days
Date Actual water use (million litres) Forecast water use (million litres)
23/07/2021 601 588
22/07/2021 612 588
21/07/2021 604 588
20/07/2021 631 588
19/07/2021 628 594
Note, water use is calculated up to 8am each day for the previous 24 hour period.

Since 1 July 2021, we have used 11.25 billion litres of water – which is 0.45 billion litres above the forecast target for this period.

Dam levels (total for 15 dams)

The dam storage levels are slightly up on last week and are sitting at a combined 48.5 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 2021, the dams have received 22.8 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 175.59 billion litres.

Sprinkler roster compliance

Since 1 January 2021, we have taken a total of 3,852 actions (warnings + fines) compared with 3,686 actions for the same period in 2020.

Annual rainfall

Perth has received 540 mm of rainfall since 1 January 2021. The average (1876-2016) rainfall for the same period to the end of July is 543.6mm.

General water news

Looking to reduce your water bills and save the environment at the same time? Our new and improved waterwise advise section now available on our website means it easier than ever to find what you need to help reduce your water use and save our most precious resource.

From keeping your lawns luscious during winter to water saving tips for the laundry and kitchen, there’s something for every household! Check out a few of our most popular articles below:

View more tips and tricks to stay waterwise