December water use to date

7 billion litres

6 billion litres

Dam storage levels


56 per cent

Cumulative streamflow into dams

178 billion litres

(Post 1975 May to December average)

144 billion litres

December rainfall to date

11.7 mm

(December mean rainfall 1994-2017)



(December average rainfall 1876-2016)


1.6 mm

Note: 1 billion litres = approx. 400 Olympic swimming pools.  Please note these figures are rounded (except for rainfall) to the nearest whole number.


Water use


Average daily water use over the last week was 927 million litres, which was above the forecast of 934 million litres. 


Since 1 July 2018, we have used 110 billion litres of water - this is 6 billion litres above what we had forecast for this period.  While we have been more ambitious in our forecast this year, water use is still about 500 million litres greater than the same period last year.


Dam level (total for 15 dams)


The dam storage level has decreased slightly over the last week, now sitting at 56 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).  Dam levels should therefore not be used as a single measure to represent the true water supply situation for Perth.


Streamflow (total for 15 dams)


From 1 May 2018 to 6 December 2018 the dams have received 144 billion litres of streamflow.  The post-1975 average for the May to December period is 178 billion litres.


Sprinkler roster compliance


The two-day-a-week sprinkler roster now applies across Perth, so make sure your sprinklers are programmed for your rostered water days and only to come on once, either before 9am or after 6pm.


Our team of inspectors issued 119 warnings and 109 fines this week.  Since 1 January 2018, we have taken a total of 8050 actions (warnings + fines) compared with 9394 actions for the same period in 2017.


Annual rainfall


Perth has received 741.4 mm of rainfall since January this year.  The cumulative average rainfall for January to December is 732.8 mm.


General water news


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