❓ A WA parliamentary question on notice seeks detailed financial and planning information regarding the Alkimos Seawater Desalination Plant, regional drainage capacity, and future Water Corporation asset relocations/augmentations. The answers provide specific figures and project details.
AnsweredQoN 922Legislative Assembly
QuestionView source ↗
(1) I refer to Metropolitan Water Supply Capacity on page 801 of 2025-26 Budget Paper No. 2 - Volume 2, and I ask: (a) As at 19 June 2025, what was the contribution of the Alkimos Seawater Desalination Plant to this line item's: (i) Estimated Total Cost; (ii) Estimated Expenditure to 30 June 2025; (iii) 2024-25 Estimated Expenditure; (iv) 2025-26 Budget Year; (v) 2026-27 Outyear; (vi) 2027-28 Outyear; and (vii) 2028-29 Outyear; (b) As at 19 June 2025, which other projects formed the remainder of this line item; (c) What was the expenditure to 30 June 2025 on the Alkimos Seawater Desalination Plant; (d) What was the actual expenditure for 2024-25 on the Alkimos Seawater Desalination Plant; and (e) Please provide and date any revisions since 19 June 2025 to (1)(a)(i), (1)(a)(iv)-(vii) and (1)(b)? (2) I refer to Regional Drainage Capacity on page 801 of 2025-26 Budget Paper No. 2 - Volume 2, and I ask: (a) What was the actual expenditure for 2024-25; (b) What projects were delivered in 2024-25; and (c) Why is $1,000 forecast for 2028-29? (3) Are there any plans to relocate or augment any Water Corporation network assets after: (a) 15 October 2025; (b) 1 January 2026; and (c) 1 July 2026?
AnswerView source ↗
Answered
18 November 2025
Responded by
Minister for Water
Response time
8 days
(1) Answers relate to the Alkimos Seawater Desalination Plant (ASDP) Program of work which includes the plant and all associated projects.
(a)
(i) $2,828,536,000.
(ii) $680,028,000.
(iii) $514,153,000.
(iv) $992,894,000.
(v) $650,973,000.
(vi) $276,688,000.
(vii) $227,953,000.
(b) The remaining significant projects within Metropolitan Water Supply Capacity include:
· Wanneroo South Ground Water Scheme Stage 1 Expansion
· Lower Helena Dam Remedial Works
· Serpentine Pipehead Dam Embankment Works
· Yanchep Water Source Upgrade
(c) $681,200,000.
(d) $465,325,000.
(e) No change
(2)
(a) $224,000.
(b) Expenditure was associated with one project to revegetate the Vasse Diversion Upgrades.
(c) This is for minimal planning work associated with relocating an eroded section of Harvey Branch Drain forecast for 2028-29.
(3)
(a) Yes
(b) Yes
(c) Yes
(a)
(i) $2,828,536,000.
(ii) $680,028,000.
(iii) $514,153,000.
(iv) $992,894,000.
(v) $650,973,000.
(vi) $276,688,000.
(vii) $227,953,000.
(b) The remaining significant projects within Metropolitan Water Supply Capacity include:
· Wanneroo South Ground Water Scheme Stage 1 Expansion
· Lower Helena Dam Remedial Works
· Serpentine Pipehead Dam Embankment Works
· Yanchep Water Source Upgrade
(c) $681,200,000.
(d) $465,325,000.
(e) No change
(2)
(a) $224,000.
(b) Expenditure was associated with one project to revegetate the Vasse Diversion Upgrades.
(c) This is for minimal planning work associated with relocating an eroded section of Harvey Branch Drain forecast for 2028-29.
(3)
(a) Yes
(b) Yes
(c) Yes
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