Wastewater modeller

Southern Water group; United Kingdom; Hybrid; GBP 30,000 - 50,000; Full time

Job summary

Southern Water invites a Wastewater Modeller to join the Modelling team in Falmer, offering hybrid working and 37 hours per week. The role focuses on building and maintaining hydraulic models to support planning, investment, and environmental protection.

With 3–5 years’ modelling experience and proficiency in InfoWorks ICM, you will analyse data, translate outputs into actionable recommendations, and collaborate across engineering, operations and environmental teams.

Qualifications

• 3-5 years of wastewater modelling experience.
• Experience using hydraulic modelling tools such as InfoWorks ICM.
• Strong analytical and problem solving skills.
• Ability to interpret complex data and turn insights into actionable recommendations.
• Chartered or working toward professional chartership.
• Relevant technical qualification (engineering, environmental science, geography, maths or similar)

Responsibilities

• Build, develop, and maintain hydraulic models of wastewater networks and treatment systems.
• Analyse operational, GIS, and asset data to understand network behaviour and highlight risks.
• Support planning, design, and regulatory programmes through evidence based modelling outputs.
• Work with engineering, operations, and environmental teams to address flooding, pollution, infiltration, capacity constraints, and resilience issues.
• Translate modelling outputs into clear, practical recommendations for technical and nontechnical audiences.
• Contribute to continuous improvement in modelling processes, tools, and data quality.

Skills

Wastewater modelling

InfoWorks ICM

Data analysis

GIS data interpretation

Cross-functional collaboration

Education

Engineering/Environmental science degree

Tools

InfoWorks ICM

Job description

Closing Date 2026-08-28

Job Title: Wastewater Modeller

Location: Falmer - Hybrid working

Contract Type: Permanent

Hours: 37 hours per week

Salary: Up to £50,000 depending on skills & experience

About the role

Join us as a Wastewater Modeller and help shape the future of our wastewater networks. You will sit within our Modelling team and play a vital role in understanding, predicting, and improving the performance of our wastewater systems. Your work will directly support planning, investment, and environmental protection across the region. This is an excellent opportunity for someone with 3-5 years of modelling experience who wants to deepen their technical capability, and gain hands on project exposure.

What you will be responsible for

• Build, develop, and maintain hydraulic models of wastewater networks and treatment systems.
• Analyse operational, GIS, and asset data to understand network behaviour and highlight risks.
• Support planning, design, and regulatory programmes through evidence based modelling outputs.
• Work with engineering, operations, and environmental teams to address flooding, pollution, infiltration, capacity constraints, and resilience issues.
• Translate modelling outputs into clear, practical recommendations for technical and nontechnical audiences.
• Contribute to continuous improvement in modelling processes, tools, and data quality.

Additional requirements specific to the role

• Occasional site visits for surveys, network investigations, or stakeholder meetings.
• Hybrid working with some travel to team locations as required.

What you’ll bring to the role

• Essential 3-5 years of experience in wastewater modelling
• Experience using hydraulic modelling tools such as InfoWorks ICM
• Strong analytical and problem solving skills with attention to detail
• Ability to interpret complex data and turn insights into actionable recommendations
• A collaborative mindset and willingness to work across multidisciplinary teams
• A relevant technical qualification (engineering, environmental science, geography, maths or similar)
• Either recently chartered or working toward professional chartership

Desirable

• Experience working with operational or regulatory wastewater programmes
• Knowledge of wastewater network performance, risk assessment, or asset planning
• Experience in the use of AI optimisation tools
• Experience in writing scripts/codes to help with automation of parts of the modelling process

Progression opportunities

This role offers access to training, modelling tool development, internal mentoring, and future progression into Senior Modeller, Network Specialist, or broader Asset/Planning roles.

About Southern Water

Southern Water is at the forefront of transforming Britain’s water industry, investing significantly to enhance resilience, sustainability, and service excellence. With £7.8bn planned investment for 2025-30, this is an unparalleled opportunity to join a business committed to delivering a generational shift in the way water services are managed. You will join at a time of significant change, working alongside a highly skilled leadership team with a clear vision for the future. We offer an environment where professionals can make a meaningful impact, influence strategic decisions, and drive long term value creation.

Our Commitment to Inclusion

We understand that great talent comes in many forms. We'll support your growth and development. We welcome applicants from all backgrounds, identities, and experiences. We do not discriminate based on race, ethnicity, gender, sexual orientation, age, disability, religion, or any other protected characteristic. If you need reasonable adjustments during the recruitment process, please let us know.

Our Commitment to Diversity

We welcome applicants from all backgrounds, identities, and experiences. We do not discriminate based on race, ethnicity, gender, sexual orientation, age, disability, religion, or any other protected characteristic. If you need reasonable adjustments during the recruitment process, please let us know.

Additional information

In line with Southern Water’s security requirements, successful candidates will be required to provide evidence of their identity, eligibility to work in the UK, criminal record check (DBS) and verification of their employment and/or education history for the past three years. Appointment to this role is subject to the successful completion of all pre-employment checks, including security vetting. Please note that if a candidate does not meet the required security standards or fails to pass the vetting process, Southern Water reserves the right to withdraw the offer of employment. Some positions may also require higher levels of security vetting, which may involve providing additional documentation.

Company Marketing

Our purpose is big. Our impact is huge. And we know that every single one of us has the power, through our actions, to positively change society and the environment for good. It's why careers with us have real meaning. Because, if you're driven and ambitious, we can offer you huge opportunities for personal growth, professional development and constant innovation. Forever evolving. Forever focused on doing the right thing, we empower and encourage everyone to play to their strengths and to help us shape a fair and positive future for all. We believe in Water for Life. If you do too, Dive Right In. Our customers are at the heart of everything we do, because delivering water for life is our core purpose. To achieve this, we need 24/7 support in place to resolve incidents quickly and efficiently. All our employees understand the importance of out-of-hours incident support - because when problems appear, fixing them is our top priority. That's why our people join together and support when and however needed to make sure our customers get the service they deserve. Joining the Southern Water family means you'll become part of our incident support team. During your interview, your manager will speak to you about any incident support rotas that apply to your position.

Flexibility Question

Does this opportunity excite you but you're not 100% sure if you meet all the requirements for the role? Or are you concerned that normal office hours aren't possible given your personal circumstances? Whilst we can’t accommodate every flexible working request, we'll try to find a practical solution. So why not engage with us and find out more about this role?