George Leslie Ltd

Key Facts

  • Client: Scottish Water Solutions
  • Engineer: Mott McDonald
  • Duration of works: November 2007 – April

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Water Treatment Works

Howden Water Treatment Works Upgrading

Howden WTW is located in the Scottish Borders, 1km west of Selkirk on the River Ettrick. The treatment works receives raw water from four production boreholes and serves a population of 16,500.

Historically the treated water quality experienced PCV failures for coliforms, clostridium, turbidity and cryptosporidium and had been unable to achieve the design output of 16 ML/day. The upgrading work which was undertaken by the Biwater Leslie Joint Venture was developed to incorporate a new Package Membrane Filtration

Plant to address these performance issues. In construction terms, the project included a new steel-clad portal frame building to house the membranes and associated ancillary equipment.

Additionally, work was also carried out to improve the existing chemical dosing facilities and improve the performance of the existing production boreholes to support the new membranes. New pipelines, pumps and an MCC were also installed to both maximise the extraction from, and maintain control over each of the borehole.


News updates


The overall project involves the off-site fabrication and installation of a new linkspan structure at Oban Ferry Terminal for client Caledonian Maritime Assets Ltd (CMal).

12th February 2019

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GL return to the Sound of Kerrera

GL making a return visit to the Sound of Kerrera off Oban, to undertake substantial repairs to the breakwater which suffered collision damage following an altercation with a workboat earlier this year.

14th December 2018

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Polmadie Bridge official opening……..

Michael Matheson MSP and Cabinet Secretary for Transport, Infrastructure and Connectivity covered all his portfolios at the official opening of the new Polmadie Footbridge giving pedestrian and cycle transport access,

18th September 2018

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George Leslie Ltd, Blackbyres Road, Barrhead, Glasgow, G78 1DU  |  |  +44 (0)141 881 9131