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DCWW2115 Service Reservoir Cleaning, Maintenance and Refurbishment CoP

Dwr Cymru Cyfyngedig

This public procurement record has 1 release in its history.

Tender

06 Oct 2026 at 14:55

UK4 - Tender Notice
Summary of the contracting process

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.

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Notice Information

Notice Title

DCWW2115 Service Reservoir Cleaning, Maintenance and Refurbishment CoP

Notice Description

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.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-0781d8
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/094342-2026
Current Stage
Tender
All Stages
Tender

Procurement Classification

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

Common Procurement Vocabulary (CPV)

CPV Divisions

50 - Repair and maintenance services

90 - Sewage, refuse, cleaning and environmental services

CPV Codes

50514100 - Repair and maintenance services of tanks

50800000 - Miscellaneous repair and maintenance services

90913000 - Tank and reservoir cleaning services

90913100 - Tank-cleaning services

Notice Value(s)

Tender Value
£25,500,000 £10M-£100M
Lots Value
£25,500,000 £10M-£100M
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
6 Oct 2026Today
Submission Deadline
2 Nov 20264 weeks to go
Future Notice Date
Not specified
Award Date
Not specified
Contract Period
15 May 2027 - 15 May 2030 3-4 years
Recurrence
Not specified

Notice Status

Tender Status
Active
Lots Status
Active
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
Dwr Cymru Cyfyngedig
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
CARDIFF
Postcode
CF3 0LT
Postcode Area
Cardiff
Country
Wales
Major Region (ITL 1)
TLL Wales
Basic Region (ITL 2)
TLL5 South East Wales
Small Region (ITL 3)
TLL52 Cardiff and Vale of Glamorgan
Delivery Location
Not specified
Local Authority
Cardiff
Electoral Ward
Trowbridge
Westminster Constituency
Cardiff East

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts.

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