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Principal Mechanical Engineer, Water Principal Mechanical Engineer, Water

Job in Whitehall, West Sussex, England, UK
Listing for: AECOM
Full Time position
Listed on 2026-06-05
Job specializations:
  • Engineering
    Water Engineer, Environmental Engineer, Water Management
Salary/Wage Range or Industry Benchmark: 125000 - 150000 GBP Yearly GBP 125000.00 150000.00 YEAR
Job Description & How to Apply Below
Position: Principal Mechanical Engineer, Water Sector Principal Mechanical Engineer, Water Sector AECOM I[...]
Location: Whitehall

Overview

We're looking for a Principal Mechanical Engineer to join our growing Water team, with opportunities to be based across our South East offices - Basingstoke, Croydon, London Aldgate and St Albans. In this role, you'll play a key part in delivering major UK water utility investment programmes, supporting the design and delivery of projects that range from small rural sites to multi-million-pound infrastructure and non-infrastructure schemes.

These frameworks are long-term and extend through AMP8 and AMP9, giving you the chance to contribute meaningfully to sustainable water solutions across multiple regions.

Program Context
  • South West Water - Framework for Engineering Consultancy Services:
    Lot 3 - Multi-Discipline Engineering Design
  • Wessex Water - Capital Delivery Partner Framework Agreement:
    Lot 2 - Design Consultant
  • Severn Trent Water - Lot 1 Major Projects Framework:
    Supporting AMP8 delivery plan valued at a Tot Ex of £14.9 billion
  • Severn Trent D&B Projects - Supporting Tier 1 contractors on major non-infrastructure wastewater schemes
  • Southern Water Strategic Delivery Partner Frameworks
Responsibilities
  • Develop feasibility studies, outline and detailed designs, and provide construction support.
  • Create design drawings, select mechanical plant, and prepare technical specifications.
  • Collaborate with multidisciplinary teams, including civil, electrical, process, and mechanical engineers.
  • Ensure high technical quality, contribute to bids, and maintain client relationships.
  • Manage project budgets, schedules, and deliverables to meet agreed targets.
  • Design mechanical installations for water and wastewater systems, including pumps, screens, valves, and odor control.
  • Conduct site surveys and liaise with clients, contractors, and suppliers.
  • Produce layouts, technical specifications, datasheets, and P&IDs for system designs.
Benefits

At AECOM you'll enjoy a range of core and personalised benefits designed to support your future and well-being, customised to fit your lifestyle. Take advantage of career development opportunities, our flexible hybrid working model to ensure a work-life balance that suits your lifestyle, technical practice networks, AECOM University, and volunteering days.

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