Water Resources Modeller

Thames Water is offering an exciting opportunity to join our Water Resources team as a Water Resources Modeller, where you’ll help shape how London’s water is managed over the next 100 years.

This role is ideal for someone curious about how complex systems work, who enjoys exploring how data and models interact, and is motivated by solving real-world environmental challenges.

What you’ll be doing as a Water Resources Modeller

• Undertake water resource system analysis and provide expert insight on solutions to support the maintenance and enhancement of our water supply capability.
• Interpreting and analysing the results of modelling, you will provide robust insight and communicate clear recommendations to internal and external stakeholders to support decision-making.
• Support delivery of key inputs to our Water Resources Management Plan and Drought Plan, including liaising with external parties, such as the Environment Agency, on modelling and analysis as required.
• Responsible for the provision of water resources data and information, including deployable output, climate change impact, outage, and headroom outputs to support operations, regulatory reporting, and long-term planning.
• Support the provision of data and information on the status of our water resources and the risk of drought, to enable an analysis of the water supply risk to our customers.
• Use our models to analyse our water resource system performance and help identify and promote the development of our modelling tools and supply-demand assessment methodologies, including influencing those required for the Water Resources Southeast (WRSE) regional planning group.

Location: Hybrid from Clearwater Court, Reading RG1 8DB
Salary: This position pays a salary between £48,000 - £60,000 per annum, depending on experience.

To thrive in this role, the essential criteria are:

• Demonstrated curiosity and systems thinking, with a desire to understand how complex water supply systems operate and respond to change.
• Proven modelling expertise using Pywr and Aquator, including developing, maintaining, and communicating model outputs for operational and strategic decision-making.
• Strong analytical and problem-solving abilities, with a critical approach to interpreting data and model results.
• Excellent communication and collaboration skills, able to translate technical findings into clear insights for diverse stakeholders.

Extra qualities that would be a great fit for our team

• Sound understanding of water resources regulation and planning frameworks, including how regulatory requirements influence modelling and investment decisions.
• Effective project management and organisational skills, delivering high-quality modelling and analysis work to agreed timelines and standards.
• Ability to code (e.g. Python or R) and a proactive approach to improving data management, data visualisation, and analysis capabilities.

What’s in it for you?

• Competitive salary of between £48,000 and £60,000 per annum dependent on experience 
• Annual Leave - 26 days holiday per year, increasing to 30 with the length of service (plus bank holidays) 
• Performance-related pay plan directly linked to company performance measures and targets 
• Generous Pension Scheme through AON 
• Access to lots of benefits to help you take care of you and your family’s health and wellbeing, and your finances – from annual health MOTs and access to physiotherapy and counselling, to Cycle to Work schemes, shopping vouchers and life assurance. 

Find out more about our benefits and perks
Who are we?

We’re the UK’s largest water and wastewater company, with more than 16 million customers relying on us every day to supply water for their taps and toilets. We want to build a better future for all, helping our customers, communities, people, and the planet to thrive. It’s a big job and we’ve got a long way to go, so we need help from passionate and skilled people, committed to making a difference and getting us to where we want to be in the years and decades to come. Learn more about our purpose and values.

Working at Thames Water
Thames Water is a unique, rewarding, and diverse place to work, where every day you can make a difference, yet no day is the same. As part of our family, you’ll enjoy meaningful career opportunities, flexible working arrangements and excellent benefits.
If you’re looking for a sustainable and successful career where you can make a daily difference to millions of people’s lives while helping to protect the world of water for future generations, we’ll be here to support you every step of the way. Together, we can build a better future for our customers, our region, and our planet.

Real purpose, real support, real opportunities. Come and join the Thames Water family. Why choose us? Learn more.

We’re committed to being a great, diverse, and inclusive place to work. We welcome applications from everyone and want to ensure you feel supported throughout the recruitment process. If you need any adjustments, whether that’s extra time, accessible formats, or anything else just let us know, we’re here to help and support.

When a crisis happens, we all rally around to support our customers. As part of Team Thames, you’ll have the opportunity to sign up to support our customers on the frontline as an ambassador. Full training will be given for what is undoubtedly an incredibly rewarding experience. It’s also a great opportunity to learn more about our business and meet colleagues.

Disclaimer: due to the high volume of applications we receive, we may close the advert earlier than the advertised date, so we encourage you to apply as soon as possible to avoid disappointment.