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Cof Cymru: National Historic Assets of Wales · Wales

Turbine House at Pontsticill Water Treatment Works

Vaynor, Merthyr Tydfil, Wales

A Grade II listed building in Pontsticill, Vaynor, Merthyr Tydfil, designated on 19 May 1999.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Turbine House at Pontsticill Water Treatment Works, Vaynor, Merthyr Tydfil, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Water Supply and Drainage
Date of designation
19 May 1999
Locality
Pontsticill
Community
Vaynor
Unitary authority
Merthyr Tydfil
Country
Wales
Coordinates
51.79636, -3.36363
Cadw reference
21732

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1856 · 42. Brecon. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 231 Merthyr Tydfil (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 14. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

In the Water Treatment Works ,adjacent to the Compensation Basin, under the dam below Pontsticill Reservoir and SW of the Filter House.

Turbine House controlled the level of water flowing over the weir. This dates from the construction of the Reservoir in 1923, a massive water engineering project involving an extensive network of piping to the urban areas of S and SE Wales, which was termed 'The Two Million Scheme'. It involved a 2 shilling (10 pence) rate on local taxes and was carried out by the Taf Fechan Water Corporation, this latter body being contributed to by each local council. Resident engineer FV Stillingfleet, and engineers Sir Alex Binnie and Deacon and Thos F Harvey. 3400 million gallons (15456 million litres) of water a day was treated, as stated on the plaque on the Compensation Basin recording its opening by Lord Buckland in 1927.

Small building of coursed occasionally snecked rock-faced sandstone with ashlar dressings, its outer side forming part of the wall of the Compensation Basin. Welsh slate roof. Round-arched doorways with heavy doors, hinges and locks at each end of inner side and multipane metal-framed round-arched windows to sides and in the gable ends, the S masked by a later addition.

Interior painted white with a stained planked ceiling. Original hydro turbine by Gilkes of Kendal is retained, though this no longer in use having been replaced by a new version. Gantry for maintenance supported by heavy corbels and valves still in place.

Included as an integral part of the original Water Treatment Works.

Group value with the Compensation Basin and the Filter House.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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