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Parliamentary Questions

Question Without Notice No. 1563 asked in the Legislative Council on 5 December 2019 by Hon Jacqui Boydell

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

Answered on


1563. Hon JACQUI BOYDELL to the minister representing the Minister for Water:

I refer to the Millstream Water Reserve water supply in the Pilbara.

(1) What volume of water is currently servicing Karratha, and how many gigalitres are being sourced from —

(a) the Millstream aquifer;

(b) Harding Dam; and

(c) other sources?

(2) What percentage of that volume is —

(a) residential use; and

(b) industrial use?

(3) What has been the yield taken from the Millstream aquifer each year for 2016, 2017, 2018 and 2019 to date?

(4) What is the predicted demand on the water reserve for the next five years?

(5) Have any potential new bore fields been investigated; and, if yes, can the minister please provide details?


I thank the member for the question. The Minister for Water has provided the following answer.

(1) Karratha is supplied from the west Pilbara water supply scheme. The volumes provided relate to the overall supply to the west Pilbara water supply scheme. For the year to date, 1 May 2019 to 30 November 2019 —

(a) Millstream aquifer, 2.8 gigalitres;

(b) Harding Dam, 1.35 gigalitres; and

(c) other sources, Bungaroo bore field, 4.4 gigalitres.

(2) Of the water supplied, 68 per cent is for —

(a) residential use, 57 per cent; and

(b) industrial use, 11 per cent.

(3) The following volumes are based on water year, 1 May to 30 April: 2016–17, 6.17 gigalitres; 2017–18, 3.25 gigalitres; 2018–19, 2.67 gigalitres; and 2019–20 to date, 2.8 gigalitres.

(4) If Harding Dam receives rainfall recharge and is available to be used over the next five years, the demand on the Millstream reserve will be approximately 2.5 gigalitres per year. If Harding Dam does not receive rainfall recharge and continues to be offline from the end of this month, the demand on the reserve will be approximately six gigalitres per year.

(5) The Water Corporation is investigating a range of other water sources. Site investigations have not yet taken place.