Hafren Dyfrdwy
Corporate brand
UnclaimedHafren Dyfrdwy is a Severn Trent-owned regulated water and wastewater company serving parts of north-east and mid Wales.
Last updated August 25, 2026
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Overview
Hafren Dyfrdwy Cyfyngedig is a regulated water company serving communities in north-east and mid Wales. Its Welsh name refers to the Severn and Dee rivers, the principal river systems associated with its operating territory. The company supplies drinking water in Wrexham and parts of Denbighshire and Flintshire, and provides both water and wastewater services in northern Powys. Its activities are carried out within the regulatory framework established by the Water Industry Act 1991. The business has roots in several historic local water undertakings. The earliest major predecessor described in the company's history is the Wrexham Waterworks Company, established under the Wrexham Waterworks Act 1864. It developed infrastructure around Pentrebychan and later built or expanded reservoirs, treatment works and pumping facilities as demand increased. The organisation became the Wrexham and East Denbighshire Water Company in the early twentieth century and absorbed a number of local undertakings during the consolidation of the British water sector. A second important predecessor was the Chester Waterworks Company, established under the Chester Water Act 1826. The Chester business was reorganised as Chester Waterworks plc in 1998. Dee Valley Group, the holding company associated with the Wrexham business, purchased Chester Waterworks in 1997 and subsequently combined the operations under the Dee Valley Water identity. Dee Valley Group was listed on the London Stock Exchange in 2002 under the ticker DVW and was included in the FTSE Fledgling Index. The corporate structure changed substantially during the 2016–2017 takeover process. Dee Valley's board first supported an offer from Ancala Fornia Limited, which would have preserved the company as an independent water business. It later recommended a higher offer from Severn Trent Water. Following competing bids and a series of offer increases, Severn Trent completed its acquisition of Dee Valley Group in February 2017. Dee Valley therefore became part of the Severn Trent group, while its Welsh operations continued to be reorganised. On 1 July 2018, the Welsh water-service areas previously associated with Dee Valley Water and Severn Trent were brought together within the Dee Valley Water company. The company received a new wastewater appointment for the relevant territory and adopted the Hafren Dyfrdwy name. The part of the former Dee Valley area located in England, including Chester, was transferred to sister company Severn Trent Water. Hafren Dyfrdwy consequently became the Severn Trent group's principal Welsh water and wastewater operating brand, focused on regulated services in the north-east and central parts of Wales.
History
Hafren Dyfrdwy's corporate history is rooted in nineteenth-century local water-supply enterprises. Wrexham's residents historically relied on wells and the River Gwenfro, whose quality was affected by industrial and commercial activity. The Wrexham Waterworks Company was created under legislation passed in 1864 and developed a supply from Pentrebychan. Early infrastructure included a reservoir and slow-sand filtration works. Further investment followed as demand grew, including the Cae Llwyd reservoir in 1878 and the larger Ty Mawr reservoir, opened in 1907. The 1907 legislation also changed the undertaking's name to the Wrexham and East Denbighshire Water Company, reflecting its expanding area. Treatment infrastructure at Legacy was expanded in the early twentieth century, and a water tower was completed there in the 1930s. During periods of drought, the company used additional sources, including pumping facilities associated with former mines. In the 1950s it consolidated with nearby water undertakings, including those serving Ruabon and Brymbo, as well as services previously operated by local authorities. It also acquired water-extraction facilities at Sesswick that had been constructed during the Second World War for the Royal Ordnance Factory at Wrexham. The other principal historical strand came from Chester. A formal Chester Waterworks Company was established by the Chester Water Act 1826, although the city had used water sources and conduits for centuries. The company operated an intake at Chester Weir, which remained in use until 2015. In 1998, the Chester undertaking was reorganised as Chester Waterworks plc. The Wrexham undertaking was reorganised as Wrexham Water plc in 1994, while Dee Valley Group was created as its holding company. Dee Valley Group purchased Chester Waterworks in 1997 and combined the two operating businesses under the Dee Valley Water name. Dee Valley Group became a London-listed company in 2002, trading under the ticker DVW and appearing on the FTSE Fledgling Index. The ownership structure changed in 2016 and 2017. Ancala Fornia Limited initially made an offer that Dee Valley's board agreed to recommend. Severn Trent subsequently submitted a higher proposal, prompting the board to change its recommendation. Ancala increased its offer, but Severn Trent responded with a further increase. Severn Trent completed the acquisition in February 2017, bringing Dee Valley into the Severn Trent group. A further territorial and regulatory reorganisation took effect on 1 July 2018. The Welsh service areas of Dee Valley Water and Severn Trent were placed within the Dee Valley Water company. The company received a new wastewater appointment and was renamed Hafren Dyfrdwy. The former Dee Valley territory in England, centred on Chester, was transferred to Severn Trent Water. Hafren Dyfrdwy now operates as a regulated Welsh water and wastewater company within Severn Trent's corporate group.
- 2018
Hafren Dyfrdwy name adopted
[1]The Welsh service areas were reorganised, the company received a wastewater appointment and the Dee Valley Water company was renamed Hafren Dyfrdwy.
- 2017
Severn Trent acquisition completed
[1]Severn Trent completed its acquisition of Dee Valley Group after a competitive takeover process.
- 2002
Dee Valley Group listed on the London Stock Exchange
[1]Dee Valley Group became a listed company under ticker DVW and was included in the FTSE Fledgling Index.
- 1997
Chester Waterworks acquired
[1]Dee Valley Group purchased Chester Waterworks and began combining the two businesses.
- 1994
Wrexham Water plc and Dee Valley Group created
[1]The Wrexham and East Denbighshire Water Company was reorganised as Wrexham Water plc, with Dee Valley Group established as its holding company.
- 1907
Ty Mawr reservoir opened
[1]The larger Ty Mawr reservoir entered service as the undertaking expanded its supply area.
- 1878
Cae Llwyd reservoir completed
[1]A new impounding reservoir was constructed upstream as demand outgrew the company's original facilities.
- 1864
Wrexham Waterworks Company established
[1]The Wrexham Waterworks Company was created by statute to develop a more reliable and sanitary water supply for Wrexham.
- 1826
Chester Waterworks Company established
[1]The Chester Waterworks Company was established under the Chester Water Act to develop and operate water-supply infrastructure for Chester.
Products and positioning
A regionally focused Welsh water and wastewater utility operating as part of the Severn Trent group, with a service identity based on the Severn and Dee river regions.
Utility service
Drinking-water supply
Hafren Dyfrdwy supplies treated drinking water to customers in Wrexham and parts of Denbighshire and Flintshire. The service is supported by reservoirs, abstraction facilities, treatment works and distribution infrastructure developed through the company's predecessor undertakings.
Utility service · 2018
Wastewater services
The company provides wastewater collection and treatment in northern Powys and holds the relevant regulated wastewater appointment for its Welsh operating area. This service became part of the Hafren Dyfrdwy structure during the 2018 reorganisation.
Brand decisions
2018
Welsh operations consolidated and renamed Hafren DyfrdwyStrategyBackground
Following Severn Trent's acquisition of Dee Valley, the Welsh service areas of Dee Valley Water and Severn Trent were reorganised.
Action taken
The Welsh water-service areas were placed within the Dee Valley Water company, which received a new wastewater appointment and adopted the Hafren Dyfrdwy name. The English remainder was transferred to Severn Trent Water.
Aftermath
Hafren Dyfrdwy became the Severn Trent group's Welsh water and wastewater operating company for the relevant regions.
2016
Board changes recommendation from Ancala to Severn TrentM&ABackground
Dee Valley's board initially supported an offer from Ancala Fornia Limited, but Severn Trent subsequently proposed a higher offer.
Action taken
The board changed its recommendation to support Severn Trent's proposal. Ancala raised its offer, followed by a further increase from Severn Trent.
Aftermath
Severn Trent completed the acquisition of Dee Valley Group in February 2017.
- Ancala Fornia Limited — Ancala increased its offer to one penny per share above Severn Trent's proposal during the competitive bidding process.
Sources1 sources
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