Water Resources Modeller

About the role

Thames Water is looking for a Water Resources Modeller to help shape how London’s water is managed over the next 100 years. The role is ideal for someone curious about how complex systems work, who enjoys exploring data and models, and is motivated by solving real‑world environmental challenges.

• Undertake water resource system analysis and provide expert insight on solutions to support the maintenance and enhancement of our water supply capability.
• Interpret and analyse the results of modelling, providing robust insight and communicating 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.
• Provide 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.

Hybrid from Clearwater Court, Reading RG1 8DB

£48,000 - £60,000 per annum, depending on experience.

• 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.

• 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.

• Competitive salary of £48,000 – £60,000 per annum depending on experience.
• Annual leave – 26 days holiday per year (increases to 30 with service length) plus bank holidays.
• Performance‑related pay plan directly linked to company performance measures and targets.
• Generous pension scheme through AON.
• Access to a range of benefits, including annual health MOTs, physiotherapy and counselling, cycle‑to‑work schemes, shopping vouchers, and life assurance.

We welcome applications from everyone and want to ensure you feel supported throughout the recruitment process. If you need any adjustments, such as extra time or accessible formats, please let us know and we’ll support you.