Costain’s £45M Rugby sewage works upgrade: process design notes for engineers
Reviewed by Tom Sullivan

First reported on New Civil Engineer
30 Second Briefing
Costain has secured a £45M contract from Severn Trent to expand and upgrade the Rugby Newbold Sewage Treatment Works, increasing treatment capacity and resilience ahead of tighter AMP8 environmental standards. The programme will focus on process stream enhancements and new assets to improve stormflow handling and nutrient removal performance, supporting compliance with more stringent discharge consents. Civil and process engineers can expect significant works on hydraulic capacity, biological treatment units and associated MEICA systems on a live wastewater site.
Technical Brief
- Costain appointed as principal contractor for Rugby Newbold Sewage Treatment Works by Severn Trent.
- Scope centres on expansion and upgrade of existing wastewater treatment assets at the Rugby Newbold site.
- Contract is explicitly aligned to Severn Trent’s AMP8 investment cycle and regulatory obligations.
Our Take
Costain’s recent results showing weaker road and rail revenue but growth in energy and water-adjacent sectors suggest the Rugby Newbold Sewage Treatment Works job fits a deliberate pivot towards regulated utility frameworks like Severn Trent’s AMP8 programme.
In our infrastructure coverage, Costain’s return to the FTSE 250 has coincided with a cluster of United Kingdom water and wastewater awards, signalling that capital markets are now partly valuing it as a lower-volatility, regulated-utility delivery partner rather than a pure transport contractor.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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