Mechanical Design Engineer - Water Industry

Advance mechanical design for national water programmes Purpose And Scope Of The Role Tetra Tech is recruiting a Mechanical Design Engineer to join our Water Consultancy team, delivering AMP8 and AMP9 projects across the UK. You will produce mechanical design outputs from feasibility through to detailed design and construction support, including pump and aeration system sizing, P&IDs, specifications, datasheets, calculations and procurement documentation. Daily activities include site surveys, multidisciplinary coordination, client liaison and digital drawing production. Work spans wastewater programmes, urban drainage studies, WINEP/SOAF/DWMP initiatives and capital delivery projects forming part of long‑term frameworks.

Your Impact In This Position In the short term you will deliver accurate, constructable designs and site reports. Over the medium term you will optimise plant performance and contribute to low‑carbon, whole‑life solutions. Longer term you will build technical expertise, mentor junior engineers and progress to senior design or project leadership roles.

Core Capabilities

• Pump and process systems design - Demonstrable experience sizing and specifying pumps, aeration and ancillary equipment with clear justification and performance checks.
• Technical documentation and CAD proficiency - Ability to produce and interpret P&IDs, GA drawings, 3D models or 2D plans, and compile comprehensive technical reports and specifications.
• Multidisciplinary coordination - Experience working with civil, structural, electrical and control disciplines and contributing to technical workshops and HAZOPs.
• Site assessment and constructability - Competence in asset condition surveys, site inspections, witnessing tests and translating findings into design recommendations.
• Quality, safety and CDM awareness - Strong understanding of CDM duties, design risk assessments, QA processes and designing for safe maintainable installations.

Skills, Qualifications And Experience Expected: degree in Mechanical Engineering (IMechE‑accredited preferred) and practical water industry experience. Desirable: postgraduate qualification, pump selection or process plant training, and familiarity with AutoCAD/Inventor or similar.

Work patterns & locations: Hybrid working with regional office attendance; travel to client sites and project locations across the UK required. Competitive salary and benefits; training and career development provided. Salary negotiable based on experience.

Why join Tetra Tech? Tetra Tech is a leading provider of consulting and engineering services working across the full project lifecycle worldwide. We have a wide range of expertise across our teams, providing a global support network with a personalised approach to client relationships to better understand where we can add value. We provide a collaborative environment that supports individual performance, innovation, and creativity.

We support public and private sector clients on local, national, and international projects to deliver sustainable and resilient solutions. Our operations in the UK, Ireland, and the Netherlands include more than 6,000 employees who are Leading with Science® to solve our clients’ most complex problems.

In alignment with the Equality Act 2010, we will make reasonable adjustments to support candidates and employees requiring additional arrangements. This could include adaptations to work schedules, training approaches, or the physical workspace. Please inform us if you need any accommodations during the recruitment process or in your day-to-day role. #Water