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Water & Wastewater


  1. Wastewater Sewer Works

  2. Wastewater Modular Treatment Plants

  3. Water Infrastructure

  4. MEI

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Our range of Water & Wastewater services includes:

Design consulting and process engineering

  • Advanced water designs

  • Specialists in MEICA and process design/engineering

  • Consulting services

  • Design and engineering

  • Temporary works design

  • Digital engineering

  • Building Information Modelling (BIM)

Non-infrastructure – treatment system solutions

  • New builds, refurbishment, and upgrades

  • New build reservoirs and Pumping stations

  • Tanks, including raw water storage, primary contact, filtration, settlement

  • Storage tanks and mixers

  • Dual contained pipework and chemical dosing systems

  • Aeration, primary, secondary and tertiary treatment plants

  • SAF, iSAF & Anoxic SAF Biological wastewater treatment

  • Electrical installations, instrumentation control and automation

  • Modular hire solutions

Treatment technology process solutions – modular

  • Design, development, manufacturing, selection of temporary and permanent wastewater treatment systems.

  • Full civil, mechanical and electrical installation

  • Maintenance of existing assets

  • Product supply for primary and secondary solids removal, phosphorus removal and biological treatment

Mechanical, electrical and instrumentation solutions

  • Project management and design (HV & LV)

  • Commissioning and protection testing

  • Full commissioning of HV installations

  • NICEIC approved contractor for hazardous and non-hazardous areas

  • Electrical design to BS7671

  • Cable installation – power, controls, and communications

  • Inspection and testing capabilities

  • Design and manufacture of LV control panels

Infrastructure – pipelines, developer and network services

  • Civils work

  • Traffic management and streetworks

  • Pipelines

  • Mains Renovation

  • Slip lining

  • Service replacements

  • Developer Services (WIRS)

  • Large scale new connections and commercial supply

Flood defence, harbour and pier, surface water management Flood Defence

  • Construction of flood defence

  • Earthworks embankment

  • Pumping station installation

  • Flood gate installation

  • Dredging and dredge deepening

  • Foreshore reclamation

  • Seawall construction

  • Surface water management ponds and channels

  • SUDs and Swales construction

We offer proven expertise in both framework delivery and bespoke project solutions. 


Our extensive national network of offices and depots ensures reliable, responsive service wherever it’s needed.

OCU is a water infrastructure service provider, safely delivering innovative and reliable solutions. We offer consultation, design, build and maintenance support for our water clients across the UK & Ireland. 


From potable and raw water systems to sewer risings mains, sewer replacement, refurbishment and more, we work closely with treatment facilities, water and wastewater networks.


Our two decades of experience in the water industry has established our reputation for delivering the full spectrum of water and wastewater treatment projects. 


What our clients say...

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