Scope
Reference
Prj_7839
Description
Southern Water is committed to reducing storm overflows and managing the volume of water entering the sewer network. A key part of this strategy involves sealing sewers to limit water infiltration and inflow, helping to protect the environment and improve network resilience.
We are inviting suppliers with proven expertise in sewer sealing to participate in this market engagement. The aim is to assess capabilities to deliver planned programmes using recognised industry techniques for sealing groundwater out of pipes such as:
• Cured-in-place pipe (CIPP) lining
• Pull-in-place liners
• Slip-lining
• Fold-and-form liners
• Full-length polymer coatings
• Targeted patch repairs
• Packer/resin injection
• Chemical/polyurethane grouting
• Cementitious grouts
• Mechanical joint seals
• Manhole rehabilitation
• Top Hat Installation
• Hot cure methods e.g Inversion, Steam Cure, UV light, LED light.
• Other sewer sealing/pathing techniques and innovations
• Other sewer sealing/pathing techniques and innovations
Information requested
• Overview of your experience and proven track record with the major sewer sealing techniques listed (though not exhaustive) above.
• Current and forecasted delivery capacity including crews and annual throughput.
• Possible geographical split for delivery including any regional offices, depots, or preferred operating areas.
• In-house technical capabilities and certifications for CCTV surveying, cleaning, lining, injection grouting, manhole rehabilitation and post-work validation.
• Ability to provide turnkey services including traffic management, reinstatement, emergency response and accurate reporting.
• Your appetite for sewer sealing supply chain innovation
This engagement is separate from the Wastewater Network Services - Lot 4, which focuses on reactive repair and maintenance of live assets. Instead, this initiative is forward-looking, targeting proactive sealing interventions to support our long-term environmental and operational goals.
Purpose and scope
The objective is to identify contractors able to programme and deliver sewer sealing works at scale, reduce inflow and infiltration, and restore or improve hydraulic and structural integrity across our sewer network. We seek information on supplier capacity, mobilisation readiness, geographic delivery options, and in-house technical capabilities for both pipe and manhole interventions.
Tender
Tender is planned to commence in late 2025/early 2026 to support planned Sewer Sealing work in AMP8, Contract commencing in 2026.
Total value (estimated)
- £100,000,000 excluding VAT
- £120,000,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 1 August 2026 to 1 August 2030
- Possible extension to 1 July 2033
- 6 years, 11 months, 1 day
Main procurement category
Works
CPV classifications
- 44163130 - Sewer pipes
- 44130000 - Sewer mains
- 90491000 - Sewer survey services
- 45232400 - Sewer construction work
- 90470000 - Sewer cleaning services
- 45232410 - Sewerage work
Contract locations
- UK - United Kingdom
Engagement
Engagement deadline
15 November 2025
Engagement process description
Southern Water is initiating a market engagement exercise to help shape our future procurement strategy for Sewer Sealing services. This will begin with the release of a Request for Information (RFI).
We encourage all interested suppliers to participate. Please note that Southern Water reserves the right to engage in further discussions with any organisation, regardless of whether they respond to the initial RFI.
Depending on the insights gathered, we may follow up with:
One-to-one meetings (either in person or online),
A live Marketplace event or townhall session (either in person or online),
and/or a second RFI, if deemed necessary.
The initial RFI is scheduled to be issued on 17th October 2025.
Participation
Particular suitability
Small and medium-sized enterprises (SME)
Submission
Publication date of tender notice (estimated)
2 March 2026
Procedure
Special regime
Utilities
Contracting authority
Southern Water Services Limited
- Public Procurement Organisation Number: PBJQ-2231-ZRPG
Southern Water, Southern House
Worthing
Bn13 3NX
United Kingdom
Email: chris.bashford@southernwater.co.uk
Website: http://www.southernwater.co.uk
Region: UKJ27 - West Sussex (South West)
Organisation type: Private utility