Thames Water is the UK's largest water and wastewater services company. Every day, it supplies around 2.6 million litres of tap water to nine million customers across London and the Thames Valley. It also removes and treats more than four billion litres of sewage for 15 million customers.
Thames Water's wastewater customers are paying for the Thames Tideway Tunnel through their bills, with the process for setting customer bills determined by Ofwat. Once completed, Thames Water will operate the tunnel as an integral part of the London sewerage network, while Tideway will be responsible for its day-to-day maintenance.
Average annual household bills for 2019/20 will include £19 for the tunnel and this will eventually rise to no more than £25 a year, before inflation.
£1.1 billion of the Thames Tideway Tunnel's construction cost is being funded directly by Thames Water.