Location
Central London, with hybrid working supported. This role can also be based in Warrington or Manchester. Regular office, client and site visits will be expected to maintain strong collaboration and delivery across UK frameworks.

Hours
Flexible working arrangements can be considered to support work-life balance.

Salary
Negotiable

About the Role
Tetra Tech’s Water Consultancy is seeking an Associate Director – Wastewater Asset Planning and Modelling to lead a growing Wastewater Consulting team and act as technical lead on major frameworks across the UK. Based in Warrington, Manchester, or Central London, you will oversee the delivery of wastewater asset planning and modelling, and catchment strategies from early feasibility through to detailed design, with a particular focus on framework delivery, client leadership, and team development. You will be responsible for technical assurance, programme coordination, commercial performance, HSE, quality, and governance across significant projects, while supporting bids, proposals, and strategic client relationships.

Initially, you will provide strong technical and team leadership across active framework commissions. Over time, you will build capability within the team, improve delivery consistency, and strengthen client confidence through high-quality outputs and responsive service. Longer term, you will help shape the direction of wastewater asset planning and modelling delivery across the UK, influence investment decisions, and lead innovative, resilient, and low-carbon solutions for major water industry clients.

Tetra Tech is a leading provider of consulting and engineering services working across the full project lifecycle worldwide. We offer a collaborative environment that supports individual performance, innovation, and creativity. Our UK, Ireland, and Netherlands operations include more than 6,000 employees who are Leading with Science® to solve our clients’ most complex problems. We are committed to equality and will make reasonable adjustments to support candidates and employees requiring additional arrangements during recruitment or in the workplace.

Experience
Proven ability to lead, mentor and develop wastewater consulting professionals, building a collaborative and high-performing team culture. Experience acting as a lead on multi-client frameworks, managing priorities, relationships, and technical outputs across concurrent commissions. Strong technical background in InfoWorks ICM, model build, verification, calibration, and the development of catchment strategies. Ability to manage programme performance, commercial risk, quality assurance, and HSE responsibilities on complex projects. Confident in leading client conversations, supporting bids and proposals, and representing the business at senior level with clarity and credibility.

About you
A strong leader with excellent communication and team development skills. You are proactive, client-focused, and able to manage multiple priorities effectively. You demonstrate a commitment to delivering high-quality, innovative, and sustainable wastewater solutions. You thrive in a collaborative environment and are motivated to influence and shape the future of wastewater asset planning and modelling across the UK.

Qualifications
A degree in a relevant technical discipline is essential; a postgraduate qualification is desirable. Chartered status, or working towards chartership, is preferred, along with membership of a relevant professional body such as CIWEM, ICE, or IWater.