Affinity Water has announced the appointment of Mark Garth as Chief Executive Officer and executive director of Affinity Water. He will join Affinity Water as CEO during the first half of 2026, following his notice period.
With extensive prior experience in the water sector, Mark Garth has held a number of senior and executive roles, initially at Severn Trent Water and then later at United Utilities, where he has led its wastewater operations with responsibility for multi-billion-pound asset and capital programmes, and most recently heading up its environmental portfolio and strategic improvement-programme delivery.
During his time at United Utilities, it has achieved industry-leading environmental performance, securing its position as a high-performing water company. He is a Chartered Water & Environment Manager and member of the Chartered Institution of Water and Environmental Management.
Mark Garth succeeds Keith Haslett, who has served as CEO of Affinity Water since January 2023- his intention to step down was announced on 2 October 2025.
Commenting on the appointment, Affinity Water chair, Mike Brown, said:
“I am delighted to announce that Mark Garth will be joining Affinity Water as our new CEO. Mark brings a wealth of relevant water sector experience as well as a wide range of leadership skills. He will be joining us at an important time for the business as we move into the second year of AMP8 and I look forward to working with Mark to continue Affinity Water’s progress and creating further value for all of our stakeholders as we embrace the opportunities and challenges ahead.
“I would also like to express my sincere thanks to Keith for his hugely valued leadership and significant contribution to Affinity Water during his role as CEO and wish him every success for the future.”
Commenting on his new role, Mark Garth said:
“I very much look forward to joining the Affinity Water Board and to working with its investors and the executive leadership team to continue to build on the achievements of the business, to navigate the challenges of AMP8, and to ensure that we successfully meet and exceed all the expectations of all our stakeholders.”
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