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.

Wastewater Sewer Works
Wastewater Modular Treatment Plants
Water Infrastructure
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

HS2 Infrastructure
Enabling and Multi Utility Diversion Works

Delivering utility diversions across water, gas, power and telecoms for a major UK rail project, with our Water and HDD teams applying NIRS, GIRS and WIRS accreditations to complete complex works in constrained environments.

Capital Major / Minor Mechanical and Electrical Frameworks

Delivering clean and wastewater projects as a Capital Alliance Delivery Partner for Welsh Water under AMPs 8 & 9, building on over 15 years of partnership and framework support across pipelines, mechanical and electrical works.

Cork Harbour Horizontal Directional Drilling

OCU was contracted to design and install twin 1,025 metre lengths of 500mm Diameter SDR-9 PE100 Foul Main under Cork Harbour using Horizontal Directional Drilling (HDD).

Dee-crossing Connah's Key

OCU was awarded the Dee Crossing contract, located in Connah’s Quay. Our teams designed and installed two 860m-long barrier pipelines under the River Dee using Horizontal Directional Drilling (HDD).