Turbine House at Pontsticill Water Treatment Works is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 19 May 1999. Turbine house.

Turbine House at Pontsticill Water Treatment Works

WRENN ID
dim-thatch-hazel
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
19 May 1999
Type
Turbine house
Address
Turbine House at Pontsticill Water Treatment Works, Vaynor, Merthyr Tydfil
OS grid reference
SO 060 117
Coordinates
51.79637, -3.36364
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Turbine House at Pontsticill Water Treatment Works is a small building constructed from coursed, occasionally snecked rock-faced sandstone, featuring ashlar dressings. Its outer side is part of the wall of the Compensation Basin, and it has a Welsh slate roof. The building includes round-arched doorways with heavy doors, hinges, and locks at each end of the inner side, along with multipane metal-framed round-arched windows on the sides and in the gable ends, although the south gable is obscured by a later addition.

Inside, the walls are painted white, and there is a stained planked ceiling. The original hydro turbine, manufactured by Gilkes of Kendal, is still present, although it is no longer in use as it has been replaced by a new version. The interior also features a gantry for maintenance, supported by heavy corbels, and valves are still in place.

Local climate

Turbine House at Pontsticill Water Treatment Works sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

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Nearby listed buildings

  1. Compensation Basin at Pontsticill Water Treatment Works Grade II 16 m
  2. Filter House at Pontsticill Water Treatment Works Grade II 69 m
  3. Dam, valve tower, bridge and outflow on Pontsticill Reservoir Grade II 171 m
  4. Dam, valve tower, bridge and outflow on Pontsticill Reservoir Grade II 222 m
  5. Pont Sticill (also known as Pontsticill Bridge) Grade II 298 m
  6. Pont Sticill (also known as Pontsticill Bridge) Grade II 302 m
  7. Brecon and Merthyr Railway bridge beside Ponsticill Reservoir Grade II 634 m
  8. Fingerpost near Church of St Gwynno Grade II 1.6 km
  9. Gravestone of Robert Thompson Crawshay and surrounding railings Grade II 1.8 km
  10. Tower of Old Church of St Gwynno Grade II 1.9 km