Project record

Singapore DTSS2 Tuas WRP nearshore outfall

Large-diameter Tuas WRP nearshore outfall pipeline sections being installed across the Singapore construction site

PUB, Singapore's National Water Agency

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.

Project signal

Construction in Singapore

Current 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 Source confidence Confirmed

Location

Singapore / Asia Pacific

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

Last checked

16 July 2026

Coverage

Related sectors

Marine utilities is the primary work classification. Related sectors connect this record to adjacent marine delivery and market coverage.

Subject index

Related subjects

These subject pages bring together related projects, technical articles, reports, and evidence methods.

Project anatomy

Contract scope and delivery roles

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 evidence boundary
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.

Project timeline

Material developments

Dated events that changed scope, counterparties, delivery, commissioning or operating status.

Open this project in the Change Log

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.

Source

Wider 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.

Source

Plant 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.

Source

Nearshore 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.

Source

PUB 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.

Source

PUB 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.

Source

Evidence gap

What remains unverified

Outstanding evidence

  • 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

Related records 2

Reporting status

Construction, confirmed confidence

Last checked 16 July 2026 across 9 cited sources. The dated timeline above carries the project events.

Last checked 16 July 2026 Cited sources 9

Sources and related records

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Source collections

Project sources 9