Location
South West London - Ashford Common (TW15 1RU), Hampton (TW12 2ES) & Walton-on-Thames (KT12 2EG)

Hours
36 hours per week (Monday to Friday), plus inclusion on an out-of-hours rota with additional payment

Salary
£46,000 to £58,000 per annum, depending on skills and experience

About the Role
Thames Water is seeking an experienced and motivated Senior Process Scientist to join our fast-paced West London team. In this pivotal role, you will have a positive and tangible impact on the water quality for the Capital's drinking water. You will play a central role in ensuring improvements, resilience planning, future protection of public health, and efficient water treatment operations.
The purpose of this role is to maintain water quality efficiently from the source to service reservoirs, responding promptly and effectively to incidents, events, and performance shortfalls. You will work within a small team of Process Scientists providing technical support to ensure compliance and champion optimisation initiatives to reduce costs or improve quality without additional expense.
Key responsibilities include:
- Monitoring water quality from source to service reservoir
- Investigating water quality failures/events at company assets and escalating to the Drinking Water Safety Plan (DWSP)
- Providing recommendations to internal and external departments to prevent future events/failures
- Offering technical support to Production and Capital Delivery schemes to meet water quality requirements
- Supporting internal water treatment works audit processes (DWSP) and conducting treatment reviews
- Representing the company in stakeholder meetings to build awareness internally and externally
- Undertaking out-of-hours technical support on a one-in-six rota, with appropriate training provided

Benefits
- 26 days holiday per year, increasing to 30 with length of service (plus bank holidays)
- Generous pension scheme through AON with a maximum employer contribution of 12% (2x employee contribution)
- Performance Related Pay Plan (PRPP) with a maximum of 10% of salary (5% on target)
- Access to a wide range of health and wellbeing benefits including annual health MOTs, physiotherapy, counselling, Cycle to Work schemes, shopping vouchers, and life assurance

About Thames Water
We are the UK’s largest water and wastewater company, serving over 16 million customers. We are committed to building a better future for our customers, communities, people, and the planet. Working at Thames Water offers meaningful career opportunities, flexible working arrangements, and excellent benefits. Join us to make a daily difference while helping protect water resources for future generations.

Experience
- Degree qualified in an appropriate discipline with postgraduate or equivalent industrial experience in a related field
- Experience in investigative work with an inquisitive mindset
- Background in water science or process engineering within a regulatory framework is advantageous
- Awareness of Industry Best Operating Practice for potable water treatment and transmission is beneficial

About you
- Enthusiastic self-starter with strong organisational, communication, and interpersonal skills
- Able to liaise effectively with internal stakeholders on a day-to-day basis
- Logical and analytical thinker who maintains a positive and professional approach when dealing with customers
- Willingness to travel to multiple sites; transport provided
- Valid UK driving licence is essential

Qualifications
- Degree level qualification in a relevant discipline or equivalent industrial experience