ConstructionCivil EngineeringWastewater Treatment Plants
Wastewater
Treatment Plants
Treatment works built to meet consent standards and protect water quality.
We deliver wastewater treatment works from new STW construction and capacity upgrades to package treatment units — engineered to meet Environment Agency discharge consent conditions and protect the receiving watercourse.
Overview
What We
Build
Wastewater treatment construction combines civil engineering, process engineering, and mechanical and electrical installation — all within a regulatory framework that sets strict limits on the quality of effluent discharged to the watercourse. We deliver treatment works that meet EA consent conditions from day one, built with the access, maintenance, and reliability in mind that long-term operation demands.
Working in and around live wastewater infrastructure requires careful planning — temporary bypasses, isolation of live flows, and phased commissioning to maintain treatment through the construction programme. Our teams are experienced in delivering upgrades without interrupting treatment capacity.
Capabilities
What We Deliver
New Treatment Works
Complete civil and process construction for new sewage treatment works — from site earthworks and inlet screening through to humus tanks, reed beds, and effluent outfalls.
Capacity Upgrades
Additional treatment capacity for growing catchments — new settlement tanks, biofilters, aeration lanes, and sludge handling — integrated with existing live plant.
Sludge Handling
Sludge thickeners, digesters, dewatering plant civils, and sludge lagoons — designed for the operational maintenance access and chemical dosing requirements of modern sludge treatment.
Package Treatment Units
Package sewage treatment plant installation and commissioning for rural locations, individual dwellings, and small commercial developments — meeting BS EN 12566 and EA consent conditions.
Regulatory Framework
Consents &
Standards
- ✓Urban Wastewater Treatment Directive (UWWTD)
- ✓Environment Agency Discharge Consents — BOD, SS, NH4
- ✓Water Industry Act 1991 — trade effluent consents
- ✓BS EN 12255 Wastewater Treatment Plants
- ✓BS EN 12566 Small Wastewater Treatment Systems
- ✓WIMES mechanical and electrical specifications
- ✓Water UK Sewerage Sector Guidance
- ✓CDM 2015 Principal Contractor duties
Building to Discharge Consent
Every wastewater treatment works is built to satisfy a specific Environment Agency discharge consent — setting limits on biochemical oxygen demand (BOD), suspended solids (SS), ammonia, and in sensitive catchments, phosphorus. We design and build treatment processes to achieve those limits reliably, not just at commissioning but throughout the operational life of the plant.
The Urban Wastewater Treatment Directive sets the framework for sewage treatment in agglomerations across the UK. We help water companies and developers demonstrate compliance — delivering the treatment capacity that consent applications require and the construction quality that EA inspectors expect to see on site.
Civil Engineering
Planning A Wastewater
Treatment Project?
New treatment works, capacity upgrade, or package plant — our team will help you achieve your discharge consent and build a plant that operates reliably for decades.
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