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Trant Engineering Ltd

Trant Scheme Shortlisted for Infrastructure Award

Trant Engineering is delighted to announce that its upgrade scheme at Southern Water's Sandown Water Supply Works (WSW) has been shortlisted for Best Large Infrastructure Project at the Institution of Civil Engineers (ICE) South East Engineering Excellence Awards 2026

By: Trant Engineering

Published: May 11, 2026

Trant Scheme Shortlisted for Infrastructure Award

The project saw delivery of a highly complex upgrade of Sandown WSW on the Isle of Wight, which supplies drinking water to residents and visitors in the South-East of the island. Trant overcame numerous challenges including limited space and extensive buried services on the historic brownfield site, while achieving all 13 regulator-defined milestones through strong collaboration and delivering an innovative, low-carbon solution.

Trant’s proposed storage design achieved major programme, cost and risk reductions, minimising below-ground construction activities, temporary works, and associated health and safety concerns. Works included power supply, pump and storage tank upgrades. For the power supply upgrades, a new incoming supply was installed in parallel with the existing system, allowing full commissioning and testing before changeover to minimise disruption and maximise potable water production.

The scheme maintained Trant’s outstanding safety record across 102,852 man-hours of construction activity. 483 safety observations were raised by the workforce, demonstrating high levels of engagement and awareness.

Regional economic benefit was generated, with significant investment in the local supply chain and majority of the workforce sourced from the local area.

Several community initiatives were also delivered, included sponsoring a new skateboard park, installing bird and dormouse boxes in nearby woodland, and organising a litter pick along the Red Squirrel Trail.

The project sets a benchmark for excellence and delivers long-term infrastructure resilience for isle. It has received extensive client recognition, exemplified by the receipt of the Southern Water “Team of the AMP” award.

The shortlisting for ICE South East Engineering Excellence Awards 2026 is testament to the outstanding commitment, professionalism and teamwork shown by Trant’s Process & Water team over the course of a challenging project – and a fantastic achievement for everyone involved.

Well done to the team for their exceptional work and best of luck to all the shortlisted teams and projects at the awards ceremony, which will take place in Maidstone on 17th June.

For More Information, contact us at https://www.trant.co.uk

Inside one of the new glass-coated steel sectional clear water tanks - Courtesy of Trant Engineering

The new glass-coated steel sectional clear water tanks - Courtesy of Trant Engineering

The £17m scheme includes 18 essential upgrade projects to ensure long-term, high-quality water supply

Trant Engineering progress first stages of £15m upgrade for Southern Water

Holdenhurst WRC (2025)

£30m investment to increase sewage treatment capacity, protect Bournemouth’s beaches and meet the needs of the expanding population

Sandown WSW: Flood Resilience (2025)

Flood resilience upgrades to protect assets in the event of a 1-in-30-year storm

Sandown WSW: pH Correction (2025)

Ensuring continuous operation of during periods of unusually low raw water pH following heavy rainfall

Southern Water EDM & U_MON4 Programme (2025)

Event duration monitoring and flow passed forward upgrades to 97 sites for Southern Water

Southern Water Eel Screens Programme - Construction (2022)

The Eels (England and Wales) Regulations 2009 requires an eel screen to be installed within a diversion structure capable of allowing at least 20m3 of abstraction in a 24-hour period. The focus of this programme is to protect a threatened species of fish, brook lamprey (Lampetra planeri). This eel-like ancient fish is rare in the UK […]

Hawkhurst South WwTW (2021)

The NEP Quality drivers for the Southern Water’s Hawkhurst South WTW are to meet the new iron and total phosphorus discharge permit limits by 31/12/2021, a tightened ammonia permit by 31/03/2025, and to maintain compliance with all aspects of the current discharge permit at lowest whole life cost. In addition, the population equivalent is set […]

River Itchen Eel Screens Project (2021)

Portsmouth Water’s River Itchen Water Treatment Works (WTW) is located to the east of Southampton Airport near to the picturesque Itchen Valley Country Park and abstracts water directly from the River Itchen for treatment. The River Itchen is 28 miles long and runs from mid-Hampshire near Cheriton through Winchester to Southampton at Mansbridge and is […]

West Huntspill WRC Bathing Waters Improvements (2021)

West Huntspill Water Recycling Centre (WRC) is a Wessex Water facility situated south of Highbridge in West Somerset. This environmentally sensitive site is within a National Nature Reserve and adjacent to a Site of Special Scientific Interest and a Special Protection Area (Bridgewater Bay and the Severn Estuary). The facility serves a catchment of 62,000 […]

Affinity Water Metaldehyde Removal Project (2020)

Affinity Water own and operate a crucial and long-standing water treatment works which is situated to support the north London water supply infrastructure. Any shortfall in the production of treated water leads directly to the need for importing water from a neighbouring water company. Four groundwater sources are combined and treated at site, all of […]

East Worthing WwTW (2020)

Located close to the English Channel, East Worthing WwTW serves a population of 140,000 in a largely urbanised area in West Sussex. In peak wet weather conditions, up to 71 million litres can flow through the site in a day. Due to the urban nature of the catchment, and some large and relatively shallow gradient […]

Southern Water Eel Screens Programme - Design (2020)

The Eels Regulations 2009 require an eel screen to be installed within a diversion structure capable of allowing at least 20m3 of abstraction in a 24-hour period. The focus of this programme is to protect a threatened species of fish, brook lamprey (Lampetra planeri). This eel-like ancient fish is rare in the UK and ranges […]

Otterbourne WTW (2019)

Otterbourne WSW is a critical site, located between Southampton and Winchester, supplying water to the surrounding area to a total of around 250,000 homes. Otterbourne was originally constructed in 1939, with extensions to the works being constructed in 1949 and 1958. The works treats borehole and river water which supply two independent treatment streams. The […]

Water Supply GRID - Conclusion (2019)

The Water Supply GRID is the largest scheme ever undertaken by Wessex Water and provides important new infrastructure for the south-west region with resilience connections to Bournemouth Water, Bristol Water and South West Water via Wimbleball Reservoir – it is effectively a south-west area regional grid (see Figure 1 below). It has improved interconnectivity within […]

Affinity Water Metaldehyde Removal Project (2018)

One of Affinity Water’s long-standing water treatment works (WTW) is to be upgraded following successful completion of industry leading research and development trials. By utilising a pioneering new technology, Affinity Water will be able to continue to deliver a high quality supply of water for customers and communities whilst continuing to operate a robust treatment […]

Ashford WwTW Sludge Treatment Centre (2018)

Ashford Wastewater Treatment Works is located in Kent alongside the M20 motorway, near the River Great Stour to the South of the Kent Downs (Area of Natural Beauty). The Town of Ashford has a population of approximately 110,000 people. The WwTW serves Ashford and surrounding areas and is supplied by five local pumping stations taking […]

Highworth WwTW (2018)

Highworth Wastewater Treatment Works (WwTW) is located at Pentylands Lane, Highworth to the northeast of Swindon. The treatment works currently serves a population of approximately 10,000 customers, with an average daily flow of 1,720m3 per day and a peak flow of 55 l/s. The works is Royal HaskoningDHV’s first full-scale Nereda plant in the UK. […]

Affinity Water Pesticide Removal (2017)

Affinity Water’s largest water treatment works (WTW) is being upgraded as part of their AMP6 business plan to ensure they continue to provide a robust treatment solution for the removal of pesticides from water abstracted from the River Thames. The scope of the works is to increase the granular activated carbon empty bed contact time […]

Avonmouth Acid Phase Digestion Remedials (2017)

Wessex Water’s Bristol STW is the largest sewage treatment works within south west region, serving approximately a catchment of 1.1 million people. The works also accounts for more than 50% of region’s sludge treatment. It treats around 100 tonnes dry solid (TDS) per day of indigenous sludge as well as imported sludge to a compliant […]

East Worthing WwTW (2017)

East Worthing WwTW in Lancing serves the Worthing and Sompting catchments in West Sussex, located on the south coast of England. The works provides treatment capacity to a population equivalent of 136,000, which is expected to rise to 155,000 by 2030. East Worthing WwTW is an activated sludge plant providing secondary treatment for flows up […]

Farlington WTW (2017)

Portsmouth Water’s Farlington WTW dates back to 1909 and provides potable water to more than 280,000 people and many businesses in the Portsmouth and Havant area. Farlington’s supply is derived from the springs, which are believed to be the largest spring source in Europe. In April 2015 Portsmouth Water issued a tender based on an […]

Farlington WTW (2016)

Portsmouth Water’s Farlington WTW dates back to 1909 and provides potable water to more than 280,000 people and many businesses in the Portsmouth and Havant area. Farlington’s supply is derived from the springs, which are believed to be the largest spring source in Europe. Raw water is chlorinated at the spring source pumping stations. At […]

Trant Scheme Shortlisted for Infrastructure Award

Trant Engineering is delighted to announce that its upgrade scheme at Southern Water's Sandown Water Supply Works (WSW) has been shortlisted for Best Large Infrastructure Project at the Institution of Civil Engineers (ICE) South East Engineering Excellence Awards 2026

Trant Engineering Awarded 38th Consecutive RoSPA Gold Award

Trant awarded Highly Commended in the Construction Engineering Sector alongside 38th consecutive Gold Award at the RoSPA Health and Safety Awards 2026

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Twyford Water Supply Works

£2.3m upgrade completed by Trant Engineering for Southern Water in March 2025

Hardham Water Supply Works

Trant Engineering are delivering Southern Water's £17m investment at Hardham WSW

At present, the UK wastewater treatment industry is facing an increasing number of challenges from a variety of different drivers both from a regulatory standpoint and with regards to increasing public awareness of pollution events. Such challenges include the need for a better effluent quality with low levels of phosphorus, ammonia, and total nitrogen (among […]