---
title: "Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation"
ocid: "ocds-kuma6s-107997"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-kuma6s-107997"
markdown_url: "https://d3tenders.com/contract/ocds-kuma6s-107997.md"
json_url: "https://d3tenders.com/contract/ocds-kuma6s-107997.json"
source: "Sell2Wales"
current_stage: "Award"
buyer: "CARMARTHENSHIRE COUNTY COUNCIL"
published: "2025-12-17"
---

# Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation

Buyer: CARMARTHENSHIRE COUNTY COUNCIL  
Current stage: Award  
OCID: ocds-kuma6s-107997

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## Summary

The procurement process for the "Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation" initiated by Carmarthenshire County Council involves the operation and maintenance of a biological treatment facility designed to manage leachate from a closed landfill site. Situated in Carmarthen, UKL14, the process falls under the services category, with major classifications including waste treatment and water pollution control (CPV 90730000). Initially set to end on 31 January 2026, the contract was extended by 10 months for additional environmental enhancements, including the installation of a denitrification reed bed. This process is guided through an open procedure with ongoing revisions, driven by environmental compliance requirements set by Natural Resources Wales.

The tender offers a lucrative growth opportunity for businesses specialising in environmental and waste management services, particularly those with expertise in biological treatment technologies. As underscored by the selection of ExCAL Limited as the supplier, the procurement emphasises technical competence in handling complex treatment systems like MBBR and SAF. Small to medium enterprises with experience in similar installations could gain significant business growth as consortia are encouraged, ensuring the amalgamation of substantial technical and operational expertise. The extended contract ensures continued collaboration, presenting long-term commercial and environmental benefits to businesses in the sector.

## Notice

** THIS IS A CONTRACT AWARD NOTICE, NOT A CONTRACT OPPORTUNITY ** Carmarthenshire County Council is responsible for the safe treatment and disposal of leachate arising from a closed landfill site at Nant-y-Caws, Carmarthen, UK. The leachate is currently treated via a biological treatment plant prior to discharge to a local river under a Natural Resources Wales issued Permit. The treatment plant consists of a MBBR (Mobile Bed Biological Reactor) and SAF (Submerged Aerated Filter) that successively treats the leachate to enable consented discharge to the river. The Council invited tenders for the operation and maintenance of the plant with suitably qualified and technically competent personnel. The site location and address is: Nant-y-Caws Landfill Site Phase 1 Nant-y-Caws Carmarthen SA32 8BG Contract Period: 01/02/2022 to 31/01/2025 with an extension option of up to a further 12 months.

### Lot Information

Lot 1

The duration of the current Contract, which was due to expire on 31/01/2026, has been extended by 10 months to enable the full installation of a new denitrification reed bed to reduce nitrate levels and completion of a reed bed permit variation application to Natural Resources Wales.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Sell2Wales |
| Latest notice | https://www.sell2wales.gov.wales/search/search_switch.aspx?ID=107997 |
| Notice type | OJEU - F20 - Modification Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Open |
| Procurement method details | Open procedure |
| Tender suitability | Not specified |
| Awardee scale | SME |
| All stages | Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 17 Dec 2025 |
| Submission deadline | Not specified |
| Future notice date | Not specified |
| Award date | 31 Jan 2022 |
| Contract period | Not specified |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £535,949 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Complete |
| Awards status | Not specified |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | CARMARTHENSHIRE COUNTY COUNCIL |
| Locality | CARMARTHEN |
| Post town | Swansea |
| Postcode | SA31 1JP |
| Country | Wales |
| ITL 1 | TLL Wales |
| ITL 2 | TLL4 Mid and South West Wales |
| ITL 3 | TLL42 South West Wales |
| Local authority | Carmarthenshire |
| Electoral ward | Carmarthen Town North and South |
| Westminster constituency | Caerfyrddin |
| Delivery location | TLL14 South West Wales |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | EXCAL |

## CPV Codes

### Divisions

- 45 - Construction work
- 65 - Public utilities
- 90 - Sewage, refuse, cleaning and environmental services

### Codes

- 45232430 - Water-treatment work
- 65120000 - Operation of a water-purification plant
- 90000000 - Sewage, refuse, cleaning and environmental services
- 90500000 - Refuse and waste related services
- 90700000 - Environmental services
- 90710000 - Environmental management
- 90720000 - Environmental protection
- 90730000 - Pollution tracking and monitoring and rehabilitation
- 90732000 - Services related to soil pollution
- 90733000 - Services related to water pollution
- 90740000 - Pollutants tracking and monitoring and rehabilitation services

## Release History

- 17 Dec 2025 at 00:00 - AwardUpdate - OJEU - F20 - Modification Notice - https://www.sell2wales.gov.wales/search/search_switch.aspx?ID=107997
- 25 Feb 2022 at 00:00 - Award - OJEU - F3 - Contract Award Notice - https://www.sell2wales.gov.wales/search/search_switch.aspx?ID=107997

## Documents

- https://www.sell2wales.gov.wales/search/show/search_view.aspx?ID=FEB389924
  Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation - ** THIS IS A CONTRACT AWARD NOTICE, NOT A CONTRACT OPPORTUNITY ** Carmarthenshire County Council is responsible for the safe treatment and disposal of leachate arising from a closed landfill site at Nant-y-Caws, Carmarthen, UK. The leachate is currently treated via a biological treatment plant prior to discharge to a local river under a Natural Resources Wales issued Permit. The treatment plant consists of a MBBR (Mobile Bed Biological Reactor) and SAF (Submerged Aerated Filter) that successively treats the leachate to enable consented discharge to the river. The Council invited tenders for the operation and maintenance of the plant with suitably qualified and technically competent personnel. The site location and address is: Nant-y-Caws Landfill Site Phase 1 Nant-y-Caws Carmarthen SA32 8BG Contract Period: 01/02/2022 to 31/01/2025 with an extension option of up to a further 12 months.
- https://www.sell2wales.gov.wales/search/show/search_view.aspx?ID=DEC571721
  Nant-y-Caws Landfill Site Phase 1 Leachate Effluent Treatment Plant Operation

## Notice URLs

- https://api.sell2wales.gov.wales/v1?lang=cy/Notice?id=ocds-kuma6s-107997
- https://www.carmarthenshire.gov.wales

## 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-kuma6s-107997. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-kuma6s-107997.json.