Project record

Honiara wastewater mains and two deep-sea outfalls

A large-diameter sewer pipe being lowered into a supported trench on the Fisheries-to-Ranadi section in Honiara in October 2024

Solomon Water

Honiara has rehabilitated two old wastewater outfalls and built part of the eastern sewer network, but the next marine package is not settled in public. The 2023 EIA designs two lines: 350 m by 400 mm at the National Referral Hospital and 500 m by 800 mm at Ranadi. Solomon Water's 2025 plan also repeats an older three-outfall basis with a 900-1,000 m by 357 mm NRH line and a 500 m by 312 mm Soap line, while separately budgeting NRH and Ranadi packages. ADB still lists bid documents in preparation and no new-outfall works award.

Project signal

Tender in Solomon Islands

Treat the open opportunity as two proposed work packages with an unresolved final marine baseline. The public documents do not reconcile the older three-outfall language with the later NRH and Ranadi pair, so pipe demand, offshore reach, pumping duty and installation method remain tender-stage questions. The 2025 EIB approval supports related sewer lines and a small septage plant but explicitly excludes the new pumping stations and sea outfalls.

Current status ADB still lists bid-document preparation for the new marine works; Solomon Water's public plan carries competing three-outfall, two-new-outfall and NRH/Ranadi package definitions, with no works award disclosed Source confidence Confirmed

Location

Solomon Islands / Global islands

Segment

Marine utilities

Status

ADB still lists bid-document preparation for the new marine works; Solomon Water's public plan carries competing three-outfall, two-new-outfall and NRH/Ranadi package definitions, with no works award disclosed / Confirmed

Evidence reviewed

19 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
Government of Solomon Islands; Solomon Islands Water Authority trading as Solomon Water
Delivery parties
Pacific Engineering Projects Ltd - contractor for the separate Ranadi Road-to-Goodwood sewer works; no contractor is disclosed for the NRH or Ranadi outfall works
Contract route
The wider Urban Water Supply and Sanitation Sector Project is supported by ADB, EU, World Bank, GEF and government financing. Solomon Water's 2025 corporate plan carried separate planning estimates of USD 13.2 million for the NRH sewer and outfall and USD 23.8 million for the Ranadi sewer and outfall, without naming contractors. ADB currently lists the outfall bidding documents in preparation. EIB approved a related facility in December 2025, but its environmental sheet says the new pumping stations and sea outfalls are not part of that facility.
Execution window
The February 2023 environmental assessment described a staged network and a two-year construction period for the outfalls and outfall pump stations. Solomon Water's 2025 corporate plan retained Q2 2027 as a planning completion date for the NRH and Ranadi packages. The current ADB status does not support treating that date as a contracted programme because bidding documents remain in preparation.
Works package
The 2023 EIA baseline covers approximately 15 km of pipes, six pumping stations, fine screening, a 350 m by 400 mm NRH marine outfall and a 500 m by 800 mm Ranadi marine outfall. Solomon Water's 2025 plan also reproduces an older basis with 13.4 km of gravity sewer, 4.1 km of pressure sewer and 'Outfalls (3)', then lists a 900-1,000 m by 357 mm NRH line and a 500 m by 312 mm Soap line. These are competing design histories, not a combined construction scope.
Marine interfaces
The later NRH and Ranadi concept crosses reclaimed foreshore, intertidal and subtidal ground before discharging beyond the nearshore zone. The EIA considers trenching, floating and controlled sinking of HDPE pipe, diffuser connection, backfill and rock or concrete-mat protection. The tender still needs to settle the number of new marine lines, final alignments, discharge points, lengths, diameters and seabed protection.
Commercial read
The open demand includes final survey and UXO clearance, outfall pump stations, large-diameter HDPE supply and handling, beach and seabed trenching, controlled submergence, diffuser and protection works, environmental controls, testing and commissioning. The two public design histories are different enough to change pipe quantities, marine plant and installation duration. Neither proposed new outfall has a disclosed contractor or awarded price.
Next milestone
Look for issued NRH and Ranadi tenders that fix the number of new outfalls, final geometry, funding and package boundaries, followed by bidder disclosure, award, physical mobilisation and accepted discharge performance.

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.

ADB still lists the new outfall works at bid-document stage

The current record confirms two existing-outfall rehabilitations but does not disclose a construction award for the purpose-built NRH and Ranadi marine lines.

Read controlling source

EIB approved a related facility with the marine works excluded

The approval supports Honiara sewer reconfiguration, but the EIB environmental sheet limits its project to new sewer lines and a 60 cubic metre-per-day septage plant and says the new pump stations and sea outfalls are not included.

Read controlling source

The eastern landward sewer section reached 3.2 km

ADB's current implementation record reports 3.2 km constructed by 30 June 2025. That progress belongs to the landward network and does not establish marine outfall construction.

Read controlling source

Environmental design fixed a two-outfall baseline

The assessment defined a 350 m NRH line and 500 m Ranadi line, six pump stations and about 15 km of sewers, while leaving the final offshore installation method to procurement.

Read controlling source

Delivery watch

Evidence needed next

Look for issued NRH and Ranadi tenders that fix the number of new outfalls, final geometry, funding and package boundaries, followed by bidder disclosure, award, physical mobilisation and accepted discharge performance.

Decision watchpoints

  • Issued works tenders that reconcile the two-outfall and three-outfall design histories
  • Final NRH and Ranadi lengths, diameters, discharge points and pump duties
  • Confirmed funding for the outfall pump stations and marine pipelines
  • Contractor award, notice to proceed and approved marine installation method
  • UXO clearance, bathymetry, geotechnical checks and final discharge coordinates
  • Construction of the 400 mm NRH and 800 mm Ranadi outfall lines
  • Diffuser, screening, standby-power and pump-station integration
  • Closure of obsolete nearshore outfalls and foreshore clean-up
  • Hydraulic testing, discharge permits, plume monitoring and operating acceptance

Related records 2

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.

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Record control

Evidence reviewed date is not a project-event date.

IMWO changes phase, participants, scope, completion, or acceptance wording only when a dated source establishes the change. The review date records when the evidence set was checked; it does not claim that physical work changed on that date.

Evidence reviewed 19 July 2026 Sources in this record 8

Source record

ADB currently records two rehabilitated outfalls complete and preparation of bidding documents for the new works still ongoing. The February 2023 EIA defines the later two-line baseline: 350 m by 400 mm at NRH and 500 m by 800 mm at Ranadi. Solomon Water's 2025 plan repeats an older 2019 basis with three outfalls, a 900-1,000 m by 357 mm NRH line and a 500 m by 312 mm Soap line, then separately carries USD 13.2 million for NRH and USD 23.8 million for Ranadi with a Q2 2027 planning date. ADB's August 2022 Goodwood land plan records another interim design state: a replacement short beach outfall at Goodwood, with long-term consolidation to a single Soap outfall. It is design-history evidence, not authorization for the later NRH and Ranadi deep-sea pair. The planning figures and dates are not awards. EIB's related facility excludes the new pumping stations and sea outfalls. The October 2024 field account and 2025 safeguards report document the separate landward sewer works.

Phase: tender. Evidence reviewed: 19 July 2026.

Project sources 8