Designers, Suppliers, and Tier-1 Contractors for the Water Infrastructure Industry in the UK
by Rami Elias Kremesti M.Sc., CSci, CEnv, CWEM
© 2025 – Kremesti Environmental Consulting Ltd. – All Rights Reserved
The Engineering Consultancies – The Designers
These companies do the detailed modelling and designs of the water/waste water treatment systems and networks.
ARUP
Jacobs
Mott MacDonald Bentley
Atkins -Realis
Arcadis
Fichtner Consultants
WRC
Tetra-Tech
The Suppliers
KSB: Pumps, valves
Grundfos: Pumps, valves
Xylem: Pumps, Ozone Systems
AVK Valves
GF+ Valves
Prominent for Chemical Dosing Systems
DeNora for Chlorination Systems
Hach Lange for Sampling/Analysis Systems
Tier – 1 Contractors
Balfour Beatty:
A major player with a strong track record in large-scale infrastructure projects.
Kier Group:
A well-established company with expertise in various infrastructure sectors, including water.
Laing O’Rourke:
Known for innovative construction techniques and a focus on delivery.
Morgan Sindall:
A Tier 1 contractor specializing in infrastructure projects, including water infrastructure.
Mace:
A leading construction firm with experience in large-scale water infrastructure projects.
Skanska UK:
A global company with a strong focus on sustainability and efficiency in water infrastructure projects.
Costain:
A company with a long history in the UK, known for its expertise in infrastructure.
The UK Water Utilities – The Client
Thames Water:
The UK’s largest water and wastewater company, serving London and the Thames Valley.
United Utilities:
The UK’s largest listed water company, operating across the North West of England.
Severn Trent Water:
A leading water company serving the Midlands and parts of the West of England.
Wessex Water:
Serves the South West of England.
Yorkshire Water:
Provides water and sewerage services to the North of England.
Dŵr Cymru Welsh Water:
The primary water and wastewater utility in Wales which is a non-profit.
Other Significant Companies:
Northumbrian Water:
Serves the North East of England.
South West Water:
Operates in the South West of England, including Bournemouth and Bristol.
Anglian Water:
Supplies water and wastewater services to East of England, including Hartlepool.
Affinity Water:
A water-only company providing water to parts of London, Eastern and South Eastern England.
South East Water:
A water-only company serving the South East of England.
Portsmouth Water:
Another water-only company serving Portsmouth and surrounding areas.
Essex & Suffolk Water:
A water-only company serving Essex and Suffolk.