It said it was hopeful the Tideway Tunnel, a deep-level sewer that became operational this year, will have a “transformative effect” on water quality.
Thames Water has been approached by BBC Sport for comment.
Last month it said that £1.8bn would be committed to improve river health in London.
It said the Tideway Tunnel and associated upgrades would capture 95% of the untreated sewage currently entering the tidal Thames in a typical year.
British five-time Olympic rowing champion Sir Steve Redgrave said: “It’s a real worry that in 2025 unsafe water quality in the Thames is still a concern.
“Rowers, river users and the public deserve better.”
Last month Redgrave wrote to Environment Secretary Steve Reed calling for more action to combat river pollution.
The men’s and women’s Boat Races take place on Sunday, with live coverage on BBC One from 12:20 BST.
BBC News
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