Thames Water have announced they are planning to cut 140 jobs the GMB Union was told on Thursday.
The redundancies will affect the loss of retail and digital positions, the GMB Union said.
Thames Water are refocusing on a turnaround plan to which will “strengthen the operational” and “financial resilience.”
GMB national officer Gary Carter said, “In the 40 years since privatisation we’ve seen virtually no investment, systematic asset stripping and billions of public money drained from the system to fill already bulging shareholder and fat cat coffers.
“As a result, Thames is on its knees and water workers are losing their livelihoods.
“GMB will fight to minimise any compulsory redundancies and make sure our members get every penny they are due.”
A Thames Water spokesperson said: “Delivering our refocused turnaround plan will strengthen the operational and financial resilience of Thames Water, so that we can continue to meet our customers’ needs, and create a platform from which to accelerate progress, underpinning our business plan for 2025-2030 and beyond.
“However, we know we can’t do everything.
“The last year has been an extremely challenging year for the business and we continue to take a rigorous approach to financial discipline throughout the company in order to operate within budget.
“We need to make more difficult but necessary decisions to ensure we continue to deliver to our budgets.
“That’s why today we’ve announced a range of measures to reduce our costs further and become more efficient.
“This means we are consulting on a proposal which could lead to the potential loss of around 300 roles.
“We will seek to minimise compulsory redundancies wherever possible, through redeployment and voluntary redundancy.
“Frontline colleagues will not be impacted by these proposed changes, with roles at risk primarily in our retail and digital functions as well as some other areas.
“Change does mean difficult decisions and we are focused on supporting our colleagues throughout the process.”