Closing Date 2026-07-10 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. 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. If this role isn’t quite what you’re looking for but you’d like to be contacted about opportunities at Southern Water, you can register your details here: Introduce Yourself: https://wd3.myworkdaysite.com/en-US/recruiting/southernwater/SouthernWater/introduceYourself 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. 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. 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?
