Thames Water
In June 2018 regulators made Thames Water pay £65 million to customers among other problems because they failed to fix leaks. In June 2023 leak levels were at their highest for five years. It was estimated to be losing  a day.  In July 2023 it was fined  £3.3 million after it discharged millions of litres of undiluted sewage into the Gatwick Stream in Sussex and River Mole in Surrey.