Wastewater modeller

Location: Falmer – Hybrid working

Contract Type: Permanent

Hours: 37 hours per week

Salary: Up to £50,000 depending on 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 non-technical 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.

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. If this role excites you and you share our commitment to delivering sustainable solutions for our communities, please apply—even if your experience doesn’t perfectly match every requirement. We’ll support your growth and development.

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

All offers are subject to right-to-work checks, DBS checks, and verification of the last three years of employment and/or education history. Some roles may require additional levels of security vetting.