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Water & Environmental

Our proven expertise in both framework delivery and bespoke project solutions is supported by

an extensive national network of offices and depots, ensuring a reliable, responsive service.

OCU is a water & environmental infrastructure service provider, safely delivering innovative and reliable solutions. We offer consultation, design, build and maintenance support for our 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. In addition we offer comprehensive specialist design and installation capability across the Heat Networks sector.




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  1. Wastewater Sewer Works

  2. Wastewater Modular Treatment Plants

  3. Water Infrastructure

  4. MEI

Our range of Water & Environmental 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

What our clients say...

Featured Case Studies

Preseli Pumping Station

OCU delivered the upgrade of pumping and control infrastructure at Preseli Clear Water Pumping Station, which supplies treated water directly into the distribution network.

Tafarnaubach Trunk Main Renewal

OCU delivered the emergency replacement of the Tafarnaubach trunk main after a landslide during Storm Dennis caused failure of a 600mm water main supplying the local network.

Pen Y Ball Pipeline

OCU delivered the construction of a 5.2km clean water pipeline between Lixwm and Pen Y Ball Reservoir in North Wales.

Bredenbury Pressurised Pipeline System

OCU delivered the Bredenbury Pressurised Pipeline System for Dŵr Cymru Welsh Water as part of its Main Network Renewal programme.

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