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Parliamentary Questions

Question Without Notice No. 1274 asked in the Legislative Council on 29 October 2019 by Hon Robin Scott

Minister responding: Hon D.J. Kelly
Parliament: 40 Session: 1

Answered on


1274. Hon ROBIN SCOTT to the minister representing the Minister for Water:

I refer the minister to the Perth seawater desalination plant located in Kwinana.

(1) How much water is sucked out of Cockburn Sound by the Kwinana desalination plant each day?

(2) How much drinking water is produced each day from that total amount of seawater extracted from Cockburn Sound?

(3) How much wastewater is returned into Cockburn Sound each day?

(4) What is the total cost per kilolitre of water produced from the Kwinana desalination plant?


I thank the member for the question.

(1) Each day, up to 349 million litres of seawater is extracted from Cockburn Sound.

(2) Each day, up to 149 million litres of drinking water can be produced.

(3) Each day, approximately 200 million litres of brine is returned to Cockburn Sound.

(4) The operating cost in 2019–20 is estimated to be 68 a kilolitre. The total unit cost, taking into consideration construction costs and conveyance infrastructure, results in a total cost of desalinated water of between $2 and $3 a kilolitre.