2026 UK Graduate Wastewater Network Modelling Career Path

Engineer a Better Tomorrow – For People, Planet, and Progress

At Mott MacDonald, we’re more than just an engineering, management, and development consultancy—we’re a purpose-driven community of passionate individuals committed to shaping a better future. As a wholly employee-owned business, we choose our own direction and focus on what truly matters: delivering meaningful outcomes for our clients, empowering our people, and making a positive impact in the communities where we live and work.

We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact. It’s our people who power that performance—we succeed when they do.

About the Role

We’re currently looking for a Graduate Wastewater Network Modeller to join our Water Utilities Division, a centre of excellence that supports colleagues across our global business. You’ll be part of a team tackling some of the most pressing challenges of our time—climate change, ageing infrastructure, pollution incidents, Combined Sewer Overflow (CSO) spills, and population growth—by designing resilient wastewater networks and delivering major pipeline transfers and drainage systems that protect communities and the environment.

This role offers a fantastic opportunity to grow your technical and project management skills through diverse and impactful project work. You’ll be supported by senior and principal modellers and collaborate across our UK-wide modelling team, gaining exposure to national and international water frameworks.

What You’ll Be Doing:

• Build and calibrate 1D and 2D hydraulic models

• Assess and influence CSO activity and operation to meet sector targets

• Evaluate foul water flooding and wastewater network resilience

• Develop mitigation solutions and present options to clients

• Work with industry-standard modelling software, GIS, and coding tools

• Produce high-quality reports and visualisations

• Collaborate with multidisciplinary teams across the business

Explore More

Discover how we’re transforming water networks:

Wastewater networks - Mott MacDonald

Candidate Specification

We are looking for committed and motivated graduates with a genuine passion and a desire to make a difference in the world. If this describes you, apply today to launch your career at Mott MacDonald.

To be eligible for this opportunity, you will have some relevant experience (excluding placements) and have a minimum of a bachelor’s degree (obtained no earlier than 2024) or expected to achieve one, in one of the following degree disciplines: 

• Geography

• Hydrology and Water Management

• Water and Environmental Engineering

• Environmental Science

• Civil Engineering

• Mathematics

In your application, you should aim to demonstrate your genuine interest in both the opportunity and in joining Mott MacDonald. You can do this by highlighting any relevant experience or interests - such as modules you've studied, previous work experience, or any research you've undertaken about our company, values, and projects.

We personally review every completed application form we receive as this part of our selection process is entirely human led, we do not use AI tools at this stage and kindly expect you not to either. We want you to answer each application question with authenticity so we can get to know the real you. Joining us as a graduate is your opportunity to shape your own story

We are looking for graduates with the following characteristics:

• Methodical approach to problem solving.

• Ability to use your initiative to undertake tasks efficiently and independently.

• Excellent verbal communication skills, which allow you to confidently liaise with clients and team members.

• Excellent written communication and attention to detail.

As we want the best people for the role, we support adaptable working.  Please ask us at interview stage about any adaptability you may need.

Mott MacDonald Ltd. is not able to provide visa sponsorship through the UK Skilled Worker route at this time. This is due to changes made by the UK Government in April 2024.

Our ethos is to develop, train and retain our graduates and therefore we are looking for a long-term relationship with our graduates.

About your development

A graduate position should be more than just a job. We know this and so do you. That’s why with our graduate roles we aim to give you the experience and technical knowledge you need to progress your career. From the moment you join us, you’ll receive the training you need. You will be assigned a mentor, who will guide you to meet the objectives of your professional training needs. You will join our three-year early careers soft skills development programme – Accelerating your Future, which is designed to give you the skills and tools necessary for a long-lasting successful career here at Mott MacDonald.

You will have the opportunity to make a difference; learn more about Our Purpose and the difference we can make! 

You’re probably wondering what else is on offer. Join us, and you’ll get:

• Biannual salary reviews: we believe that hard work should be rewarded and recognised. Therefore, for the first three years of your career with us, you’ll have biannual salary reviews.

• A competitive salary: in addition to biannual reviews, we will ensure that you’re given a salary that matches the current industry standard.

• Contributory pension up to 7% of your salary: we have the best people on our team, and we like to look out for them. With our support, you’ll have all the advice and options you need to be able to invest in your future.

• An adaptable benefits scheme: our company is made up of a range of different people, and we understand that different people want different things. That’s why with our adaptable plan, you’ll have the ability to manage the range of benefits we have on offer, to suit your specific needs.

Our social side

Being part of Mott MacDonald means more than just work; there’s a huge range of fun and exciting things that you can get involved in. 

From the moment you join us, you’ll have the opportunity to expand your social and professional network, whether it’s meeting other graduates or joining forces with other members of staff from around the company at our annual sports day. Each of our offices have a sports and social committee which will give you the chance to be part of a variety of sports, social and charity events. We’re committed to promoting a solid culture of social responsibility and encourage our staff to play active roles in the local community.

It's worth noting that sports and social committees tend to vary from office to office, so as well as getting involved in what’s already on offer, don’t be afraid to suggest new events or initiatives that you think could be a great addition. It doesn’t stop there. As well as events, you’ll also have access to discounts on cinema tickets, travel, fashion, utilities and much more as part of our company benefits which you can take advantage of the moment you join. 

Equality, diversity and inclusion

We put equality, diversity and inclusion at the heart of our business, seeking to promote fair employment procedures and practices to ensure equal opportunities for all. We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they have the opportunity to contribute.

Agile working

At Mott MacDonald, we believe it makes business sense for you and your manager to choose how you can work most effectively to meet your client, team and personal commitments. We embrace agility, adaptability and trust.

More about Mott MacDonald

We’re a global engineering, management and development consultancy.

Our purpose is to improve society by considering social outcomes in everything we do, relentlessly focusing on excellence and digital innovation, transforming our clients’ businesses, our communities and employee opportunities.

A fundamental part of this is respecting each person’s differences and striving to meet their needs.

Our values: progress, respect, integrity, drive, excellence.