--- title: "DCWW2115 Service Reservoir Cleaning, Maintenance and Refurbishment CoP" ocid: "ocds-h6vhtk-0781d8" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0781d8" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-0781d8.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-0781d8.json" source: "Find A Tender Service" current_stage: "Tender" buyer: "Dwr Cymru Cyfyngedig" published: "2026-10-06" --- # DCWW2115 Service Reservoir Cleaning, Maintenance and Refurbishment CoP Buyer: Dwr Cymru Cyfyngedig Current stage: Tender OCID: ocds-h6vhtk-0781d8 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0781d8) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-0781d8.json) ## Summary Dwr Cymru Cyfyngedig is seeking suppliers for a framework covering cleaning, inspection, maintenance and refurbishment of potable water service reservoirs across its operational area in Wales. The estate includes about 828 tanks, mostly underground concrete structures, as well as above-ground steel and concrete tanks and a small number of water towers. Cleaning includes disinfection using suitable methods and approved products, with chemical cleaning where required. Maintenance covers minor planned and reactive repairs identified during cleaning, including concrete and steel repairs, coatings, membranes, ladders, pipework, joints and external earthworks, plus emergency repairs. The work is intended to keep water-storage assets clean and operational, support their safe return to service and meet drinking-water requirements. The buyer invited offers through a competitive flexible procedure, with a participation stage followed by two tender rounds. The procurement is one lot, with two suppliers to be appointed to a closed framework; routine work will be allocated using published criteria, while some higher-value or complex work may be competed between framework suppliers. The stated bid deadline was 2 November 2026 at 23:59 UTC. The contract period is 15 May 2027 to 15 May 2030, with possible extensions of up to five years, in periods of two, two and one years. The estimated value for the initial three years is £25.5 million; the stated maximum-term value is £68 million. Award is based on the most advantageous tender, weighted 60% commercial and 40% technical. This opportunity suits reservoir-cleaning and water-infrastructure maintenance contractors able to work safely in potable-water storage assets and deliver routine cleaning and inspection at estate scale. Suppliers need capability in tank cleaning and disinfection, including use of approved disinfectants and, where required, approved chemical-cleaning products. They should also be able to identify and carry out minor remedial work across concrete and steel structures, coatings, membranes, ladders, pipework, joints and external earthworks, and respond to emergency repairs. The framework requires capacity to support planned work and return reservoirs safely to service; work allocation may take supplier capacity, workload, geographic coverage and performance into account. The buyer indicates that SMEs are suitable to compete. Successful suppliers should be prepared to facilitate a site visit during the tender process. ## Notice Overview And Objectives DCC intends to award a Framework Agreement for Service Reservoir Cleaning, Maintenance and Refurbishment services. It is a business-critical service required to: * maintain the cleanliness, integrity and operational condition of DCC's potable water storage assets; * support the safe and timely return of service reservoirs to operation following planned cleaning, inspection and minor remedial works; and * support compliance with Drinking Water Inspectorate (DWI) requirements, DCC's internal standards and applicable water quality legislation. The Framework will be used to provide cleaning and maintenance for potable water tanks across DCC's operational area. There are approximately 828 tanks within DCC's estate that require routine cleaning and inspection in accordance with PNL 810 (DCC's internal standard for drain downs and cleaning of service reservoirs) to meet Drinking Water Inspectorate (DWI) regulations. Tanks include below ground and above ground steel or concrete tanks as well as a small number of water towers however most tanks are square, underground concrete structures. Ensuring a clean and consistent water supply is core to DCC services and is linked directly to corporate key performance indicators. The proposed contract term is 3 years, with the option to extend for a further 5 years (2 + 2 + 1 years). The estimated value of the framework for the initial three-year term is PS25.5 million based on estimated annual expenditure of approximately PS8.5 million. The value across the maximum term of 8 years is PS68m. Scope The scope includes the following elements: Cleaning This includes the cleaning and disinfecting of the tanks normally with the use of high-pressure water or soft brush as appropriate and DWI Approved disinfectant. In some instances, it may be a requirement to carry out chemical cleaning with the use of a DWI approved chemical. The tasks to be carried out will include: * Cleaning and disinfection of potable water storage tanks using appropriate methods and DWI-approved products * Inspection of service reservoirs as part of cleaning activities Maintenance Maintenance activities are usually identified at the time of cleaning by the Supplier and instructed by DCC to enable the tanks to be safely returned to service. These tend to be internal and external works for concrete repairs and coatings, internal and external steel repairs, membrane fitting and repairs, replacement of ladders and pipework, joint repairs, external earthworks repairs and joint repairs. Emergency reactive repairs to concrete/ pipework / liner etc. may also be required on occasion. These works will exclude any work that involves significant engineering difficulties such as: * Any structural modifications to the tank(s); * Any works on the embankments surrounding the tank(s); * Any modifications to the pipework that can influence the hydraulic performance of the tank(s); * Any works that alters the operating capacity of the tanks; * Any works that constitutes the appointment of a Panel Engineer under the Reservoirs Act. The tasks to be carried out will include: * Minor planned and reactive remedial works, including concrete and steel repairs, coatings, membranes, ladders, pipework, joints and external earthworks. * Emergency reactive repairs where required. * Activities necessary to support the safe return of reservoirs to service. The Framework Agreement will be procured as a single Lot, with two Suppliers appointed to the Framework. ### Lot Information Lot 1 Renewal: The contract can be extended for a maximum of 5 years (2 + 2 + 1 years), based on supplier performance and operational circumstances. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/094342-2026 | | Notice type | UK4 - Tender Notice | | Procurement type | Framework | | Procurement category | Services | | Procurement method | Open | | Procurement method details | Competitive flexible procedure | | Tender suitability | SME | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 6 Oct 2026 | | Submission deadline | 2 Nov 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | 15 May 2027 - 15 May 2030 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £25,500,000 | | Lots value | £25,500,000 | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Active | | Lots status | Active | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | Dwr Cymru Cyfyngedig | | Locality | CARDIFF | | Postcode area | Cardiff | | Postcode | CF3 0LT | | Country | Wales | | ITL 1 | TLL Wales | | ITL 2 | TLL5 South East Wales | | ITL 3 | TLL52 Cardiff and Vale of Glamorgan | | Local authority | Cardiff | | Electoral ward | Trowbridge | | Westminster constituency | Cardiff East | | Delivery location | Not specified | ## CPV Codes ### Divisions - 50 - Repair and maintenance services - 90 - Sewage, refuse, cleaning and environmental services ### Codes - 50514100 - Repair and maintenance services of tanks - 50800000 - Miscellaneous repair and maintenance services - 90913000 - Tank and reservoir cleaning services - 90913100 - Tank-cleaning services ## Release History - 6 Oct 2026 at 14:55 - Tender - UK4 - Tender Notice - https://www.find-tender.service.gov.uk/Notice/094342-2026 ## Documents - https://www.find-tender.service.gov.uk/Notice/094342-2026 6th October 2026 - Tender notice on Find a Tender ## Notice URLs - https://dwrcymru-welshwater.bravosolution.co.uk - https://www.legislation.gov.uk/ukpga/2023/54/contents ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-0781d8. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-0781d8.json.