Location
Singapore / Asia Pacific
Project record
Singapore DTSS2 Tuas WRP nearshore outfall
Singapore's Tuas Water Reclamation Plant incorporates a 1.8 km pipe, increasing from 1.2 m to 3 m in diameter, to convey treated effluent to a nearshore sea outfall. PUB records the outfall and other Contract 1A permanent works as substantially completed on 14 August 2023. That did not complete the wider water system: PUB's December 2025 update put DTSS Phase 2 at about 80% and Tuas WRP at 57%, while the current programme page schedules phased commissioning from 2027.
Segment
Marine utilities
Status
Nearshore outfall and Contract 1A permanent works were substantially completed on 14 August 2023; wider DTSS2 and Tuas WRP completion, commissioning and discharge acceptance remain open / Confirmed
Evidence reviewed
16 July 2026
Controlled taxonomy
Related sectors
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Knowledge context
Related knowledge topics
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Project anatomy
Scope, counterparties, and execution logic
- Client / authority
- PUB, Singapore's National Water Agency
- Delivery parties
- McConnell Dowell South East Asia - Contract 1A Site Development Works, including the nearshore outfall, Jacobs - DTSS Phase 2 programme management and engineering consultancy
- Contract route
- PUB delivered DTSS Phase 2 and Tuas WRP through multiple public works and engineering packages. Contract 1A combined site development, common utilities and the nearshore outfall; McConnell Dowell began that package in January 2019 after PUB called the first Tuas WRP tenders in May 2018.
- Execution window
- PUB called the first Tuas WRP tenders in May 2018 and records McConnell Dowell beginning Contract 1A in January 2019. The nearshore outfall and other permanent Contract 1A works were substantially completed on 14 August 2023. At December 2025 the overall DTSS Phase 2 programme was about 80% complete and Tuas WRP was 57%; the current owner programme schedules phased commissioning from 2027.
- Works package
- A 1.8 km treated-effluent pipe to the nearshore outfall, ranging from 1.2 m to 3 m in diameter, delivered within site-development works that also provided common roads, drainage and utilities for the wider Tuas WRP construction programme.
- Marine interfaces
- The marine boundary is the final treated-effluent route from Tuas WRP through the large-diameter outfall pipe to sea discharge. Civil completion of that route must interface with completed treatment processes, plant hydraulics, mechanical and electrical systems, monitoring, discharge controls and the wider DTSS conveyance network before operational performance can be established.
- Commercial read
- The named outfall civil package is a completed delivery reference, not an open construction award. Remaining work covers plant and network completion, MEICA integration, hydraulic and wet commissioning, water-quality and environmental verification, instrumentation, inspection, maintenance planning and the operating handover that will turn the installed outfall into a controlled discharge asset.
- Next milestone
- Confirm Tuas WRP treatment-train and influent-system readiness, then obtain owner evidence for connected hydraulic testing, controlled discharge commissioning, effluent compliance, environmental monitoring, phased operating release and sustained outfall performance from 2027.
Material change register
What changed, when, and what it proves
Only source-bound events that alter phase, scope, counterparties, delivery, completion, commissioning, or acceptance are listed. A change can advance the record without proving the next gate.
PUB current programme retains phased commissioning from 2027
The owner schedule keeps whole-system operation as a future gate despite the earlier outfall civil milestone. A commissioning target does not establish first discharge or accepted performance.
Read controlling sourceWider DTSS2 reached about 80% and Tuas WRP 57%
All five tunnel contracts had received statutory completion certificates, while plant MEICA work and critical influent-shaft interfaces remained active. The outfall could not be read independently from that unfinished system.
Read controlling sourcePlant testing began within a still-incomplete programme
PUB reported DTSS2 at 77% and Tuas WRP at 54%, with MEICA installation continuing and hydraulic testing under way at selected biosolids facilities. Local tests were not whole-system discharge acceptance.
Read controlling sourceNearshore outfall and Contract 1A permanent works substantially completed
The milestone closed the principal outfall civil package while wider plant, conveyance, commissioning and environmental-performance gates remained open.
Read controlling sourcePUB documented the outfall pipe under installation
The owner fixed the physical scope at a 1.8 km treated-effluent pipe with diameters from 1.2 m to 3 m, providing project-specific evidence rather than a generic coastal-utility inference.
Read controlling sourcePUB opened the first Tuas WRP works tender
The site-development and nearshore-outfall scope entered formal procurement as part of a wider multi-package water-reclamation programme, establishing a traceable package baseline before award and construction.
Read controlling sourceDelivery watch
Evidence needed next
Confirm Tuas WRP treatment-train and influent-system readiness, then obtain owner evidence for connected hydraulic testing, controlled discharge commissioning, effluent compliance, environmental monitoring, phased operating release and sustained outfall performance from 2027.
Decision watchpoints
- Completion and handover of Tuas WRP process, MEICA and influent-shaft interfaces
- Connected hydraulic testing from treatment trains through the 1.8 km outfall route
- Effluent-quality acceptance and controlled-discharge authorization
- Outfall instrumentation, inspection access, maintenance isolation and asset-management plan
- Receiving-water monitoring and environmental-compliance evidence
- Phased 2027 commissioning, operating release and sustained performance
Project availability status
This public project page is a tracked market record rather than a tender notice, contractual commitment, or commercial instruction. Use the status, confidence label, evidence-review date, and source note together when judging how much weight to place on the signal.
Read featured analysis Review methodology Submit stronger evidence or a correction Open project trackerSource record
PUB's June 2021 project newsletter defines the 1.8 km nearshore outfall pipe and its 1.2 m to 3 m diameter range. The December 2023 newsletter records the outfall and all other Contract 1A permanent works substantially completed on 14 August 2023. Later PUB updates control the wider delivery state: June 2025 reported DTSS2 at 77% and Tuas WRP at 54%; December 2025 reported about 80% and 57% respectively, with plant MEICA work and influent shafts still active. PUB's current DTSS page schedules phased commissioning from 2027. The 2023 date therefore marks an outfall-package milestone, not discharge or operating performance.
Phase: construction. Evidence reviewed: 16 July 2026.
Project sources 9
- Deep Tunnel Sewerage System Phase 2 PUB, Singapore's National Water Agency, Current programme page reviewed 16 July 2026
- Tuas Water Reclamation Plant PUB, Singapore's National Water Agency, Current project page reviewed 16 July 2026
- PUB and NEA to call over S$5 billion in tenders for Tuas Nexus PUB / National Environment Agency, 15 May 2018
- DTSS2 Today: closer look at Tuas WRP's nearshore outfall pipe PUB, Singapore's National Water Agency, June 2021
- DTSS2 Today: Near Shore Outfall project officer profile PUB, Singapore's National Water Agency, December 2022
- DTSS2 Today: Contract 1A permanent works substantially completed PUB, Singapore's National Water Agency, December 2023
- DTSS2 Today programme update PUB, Singapore's National Water Agency, June 2025
- DTSS2 Today programme update PUB, Singapore's National Water Agency, December 2025
- PUB completes tunnelling works for DTSS Phase 2 PUB, Singapore's National Water Agency, 21 August 2023