Tender: Service Reservoir Cleaning, Maintenance and Refurbishment Framework for Potable Water Tanks – DCC (3‑yr + extensions, est. £25.5m)

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DCC is seeking a supplier for a Framework Agreement to deliver cleaning, maintenance and refurbishment services for its potable water service reservoirs across the DCC operational area. The framework covers routine cleaning and disinfection (using high‑pressure water or soft brush and DWI‑approved disinfectants, and chemical cleaning where required), inspection during cleaning, and minor planned and reactive remedial works such as concrete and steel repairs, coatings, membrane fitting and repairs, ladder and pipework replacement, joint and external earthworks repairs, and emergency reactive repairs to enable safe and timely return of reservoirs to service. The work applies to approximately 828 tanks (below‑ground and above‑ground steel or concrete tanks, a small number of water towers, with most being square underground concrete structures) and must support compliance with the Drinking Water Inspectorate (DWI), DCC’s internal standard PNL 810 and applicable water quality legislation. The proposed contract term is three years with options to extend (2 + 2 + 1 years) to a maximum of eight years; the estimated value for the initial three‑year term is £25.5 million (approx. £8.5 million per year) and £68 million across the maximum term. The framework will be procured as a single lot with two suppliers to be appointed.