Senior Wastewater Network Modeller

Southern Water; United Kingdom; Hybrid; GBP 36,000 - 60,000; Full time

Job summary

Southern Water is seeking a Senior Wastewater Network Modeller to lead projects across risk assessments, growth planning, and resilience studies. You will mentor junior modellers and ensure models are robust and auditable, using InfoWorks ICM.

The role focuses on improving workflows, automation, and digital capability, translating complex modelling insights into practical engineering solutions for regulatory and growth needs. Hybrid working in the UK.

Qualifications

• 5–10 years of wastewater modelling experience
• Experience delivering UK-based wastewater projects
• Chartered status or close to it

Responsibilities

• Lead risk assessments, growth modelling, resilience studies, and option engineering.
• Quality-check modelling outputs to ensure technical excellence.
• Mentor junior modellers and graduates.
• Lead stakeholder engagement with internal teams and regulators.

Skills

Wastewater modelling

Project leadership

UK wastewater projects

Chartered status (or close)

Tools

InfoWorks ICM

Python

Ruby

Job description

## Senior Wastewater Network ModellerApply: FALMER: Full time: Posted Yesterday: End Date: October 15, 2026 (12 days left to apply): JR7734**Closing Date**2026-08-28**Job Title:** Senior Wastewater Network Modeller**Location:** Hybrid working**Contract Type:** Permanent**Hours:** 37**Salary:** Up to £60,000 based on skills & experience**About the role:**As a Senior Wastewater Network Modeller, you will lead the delivery of high‐quality wastewater network modelling across risk assessments, growth planning, resilience studies, and optioneering. You will mentor and develop junior modellers and graduates, promoting a collaborative and technically strong team.You will oversee and carry out wastewater modelling using InfoWorks ICM, ensuring models are robust, auditable, and aligned with best practice. The role includes improving workflows through automation, strengthening digital capability, and driving continuous process improvement.You will review and challenge technical outputs, provide clear technical direction, and turn complex modelling insights into practical, sustainable engineering solutions. Your work will support long‐term environmental stewardship and the development of resilient wastewater networks that meet regulatory and future growth needs.**What you will be responsible for:*** Support, mentor, and train junior staff and graduates across modelling, analysis, and design tasks.* Lead and contribute to risk assessments, growth modelling, resilience studies, and technical design projects.* Quality‐check modelling and design outputs to ensure technical excellence.* Produce robust outline and detailed wastewater network solutions aligned with best practice and regulatory requirements.* Interpret modelling results and translate complex data into clear, actionable engineering recommendations.* Lead stakeholder engagement, presenting technical findings to internal teams, clients, and regulators.* Contribute to project planning, scoping, and programme management to ensure timely, high‐quality delivery.**What you'll bring to the role:*****Essential**** Strong technical capability to lead small-scale projects* 5 to 10 years wastewater modelling experience* Experience delivering UK-based wastewater projects* Chartered or close to chartered status***Desirable**** Programming experience (Python or Ruby)* Experience with digital design and automation tools**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 be joining 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 senior professionals can make a meaningful impact, influence major strategic decisions, and drive long-term value creation**Our commitment to inclusion**At Southern Water, we believe diverse perspectives drive innovation. If you’re passionate about making a positive impact and think you can bring value to our team, we’d love to hear from you—even if you don’t tick every box. Your unique skills and experiences could be exactly what we need.If this role isn’t quite what you’re looking for but are keen to be contacted about opportunities at Southern Water, you can register your details here: Introduce Yourself (myworkdaysite.com- Introduce Yourself)**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.