The Environment Agency secures funds for improvement work from Yorkshire Water.
Thames Water says it is aware of "pollution issues" in the Ewell area and is awaiting test results.
The 2021 fuel leak in the River Test harmed wildlife and was condemned by celebrities.
Wessex Water is told to pay £300,000 after a sewer overflowed into a Somerset river tributary.
Groups marched along the edge of the River Loddon near Basingstoke on Monday.
Ash Smith and Peter Hammond were recently portrayed in the Channel 4 docudrama Dirty Business.
Raw sewage has been surrounding people's houses for 20 years, according to a campaigner.
A rescue charity says it will continue to monitor two swans at Cleethorpes Country Park.
Julie Wassman, from Whitstable, has not paid her Southern Water bill over its sewage record.
