Thames Water is the largest water company in the UK serving nine million customers with potable water and treating the wastewater from 15 million customers in London and the Thames Valley. Thames Water implements a range of practices to minimise odour. Since June 2017, a system for the rapid response and preventive management of odorous emissions has been implemented at two large Wastewater Treatment Plants (WWTP) to a) drive improvements in odour performance and reduce customer impact by utilisation of real-time H2S and predictive weather data on odour risk and plant performance and b) effectively evaluate and manage the performance of a WWTP that has recently been upgraded including significant investment (£24M) in odour control. At Deephams WWTP, Thames has committed to reducing the number of properties in the area most affected by odour, by a reduction of more than 99%. The real time odour monitoring is part of the odour management strategy and also helps to demonstrate to the economic regulator for the UK Water Industry that the objectives of the scheme are being achieved.