March water use to date

15 billion litres

14 billion litres

Dam storage levels


48 per cent

Cumulative streamflow into dams

185 billion litres

(Post 1975 May to March average)

151 billion litres

March rainfall to date

21 mm

(March mean rainfall 1994-2017)


19.5 mm

(March average rainfall 1876-2016)

5.6 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 884 million litres, which was below the forecast of 958 million litres.


Daily water use for the last five days


Actual water use – litres

Forecast – litres

Friday, 15 March 2019



Thursday, 14 March 2019




Wednesday, 13 March 2019



Tuesday, 12 March 2019



Monday, 11 March 2019



Note: water use above is calculated up to 8am each day for the previous 24 hour period


Since 1 July 2018, we have used 200 billion litres of water - this is about 3 billion litres above what we had forecast for this period. 


Dam level (total for 15 dams)


The dam storage level has changed by one per cent over the past week and is sitting at 48 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 are no longer an accurate indicator of the health of Perth's overall water supply situation.


Streamflow (total for 15 dams)


From 1 May 2018 to 14 March 2019 the dams had received 151 billion litres of streamflow.  The post-1975 average for the May to March period is 185 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 74 warnings and 67 fines this week.  Since 1 January 2019, we have taken a total of 2245 actions (warnings + fines) compared with 2287 actions for the same period in 2018.


Annual rainfall


Perth has received 13 mm of rainfall since 1 January 2019.  Average rainfall for this period (1994-2017) is 50.7 mm.


General water news


Did you know that different types of sprinklers have different watering rates? Check the best setting for your sprinkler system by watching our new videos.

Media Enquiries:

Contact: Clare Lugar

Position: Water Corporation spokesperson

Phone: (08) 9420 2555