Contracts

Portsmouth Water plans two maintenance partners across 35 service reservoirs

Published 14 October 2026 Updated 31 October 2026 Publisher IMWO Region Europe Confidence Confirmed
Portsmouth Water reservoir isolation and chamber sampling preparation chart with UVDB categories and planned call-off allocation

IMWO original source-based engineering and procurement chart

Portsmouth Water's proposed maintenance framework covers approximately 35 concrete service reservoirs and a 135 ML raw-water reservoir. Two partners would share routine and emergency work, with larger repairs allocated through mini-competition. The history checked on 31 October still contains only the 13 October planning release, which expected a formal notice on 30 October.

Two partners would share reservoir maintenance

Planning notice 096621-2026 sets out the estate, UVDB categories 4.1.6 and 4.1.6.2, and proposed allocation rules. Its expected formal-notice date was 30 October; the official history checked on 31 October contains no later release. Portsmouth Water's 2024 annual report describes earlier inspection and maintenance at nine sites. Its September 2023 investment proposal identifies reservoir-isolation and independent chamber-sampling limitations, while DWI's 2025 England report explains asset-integrity concerns. Site arrangements and the framework documents remain to be confirmed.

Reservoir isolation governs workable maintenance visits

Draining and cleaning storage assets depend on the ability to maintain water supply and carry out independent chamber sampling. Portsmouth Water's 2023 proposal identifies these constraints directly. A supplier preparing for the framework therefore needs site-level isolation arrangements alongside repair quantities and specifications. The proposed minor-work allocation also considers availability, programming and geography, linking network access to how two partners could receive work. Supplier preparation therefore needs both the proposed allocation factors and the site access needed to carry out individual tasks.

Evidence conclusion

UVDB preparation precedes the formal notice

The current stage supports checking UVDB registration and category coverage, then following the formal notice for submission dates and contract requirements. Proposed routine and emergency tasks up to GBP 100,000 would use direct allocation; larger work would involve competition between the partners. Payment, acceptance, security and minimum workload remain dependent on the framework documents. Current isolation arrangements at each reservoir require confirmation against the historical investment proposal.

Outstanding evidence

  • Formal notice and valid submission deadline
  • UVDB registration and categories 4.1.6 and 4.1.6.2
  • Reservoir isolation, supply continuity and chamber sampling
  • Minor-work allocation and larger-repair competition
  • Payment, acceptance, security and minimum workload

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