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May water use to date

1 billion litres

1 billion litres

Dam storage levels


42 per cent

Weekly streamflow into dams


44 billion litres

May rainfall to date

88.7 mm

(April average rainfall 1994-2017)

0 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 806 million litres per day, which was above the forecast of 780 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 257.05 billion litres of water – which is 6.55 billion litres over the forecast for this period.


Dam level (total for 15 dams)

The dam storage levels have dropped slightly this week and are sitting at a combined 42.3 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 2020, we have taken a total of 2266 actions (warnings + fines) compared with 3369 actions for the same period in 2019.


Annual rainfall


Perth has received 81.40 mm of rainfall since 1 January 2020. The average (1994-2017) rainfall for the May period is 176.6 mm.


General water news


Tuesday was a fur-tastic day for our waterwise crusader, Kep, who celebrated her third birthday and great work detecting non-visible leaks.


Kep is an obedient female Springer Spaniel whose birthday trick is sitting and staying for up to two minutes when commanded without flinching.


Her other main talent is sniffing out more than 40 hard to detect leaks along 342 km of water mains across regional WA.


Kep’s nifty leak detection skills help save around 356 million litres of precious drinking water each year – that’s around 158 Olympic swimming pools!

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Contact: Media Team

Phone: 9420 2555