A decision on the expansion of the Mogden sewage works has been delayed once again after further doubt was cast on promises to curb the infamous pong.
Thames Water's application to increase the treatment works' capacity to meet Environment Agency's regulations went before Hounslow Council's sustainable development committee at a meeting on Monday.
But planning officers were told to go away and delve deeper into conditions Thames Water claims will reduce the amount of sewage being pumped in to the river, but which many say will only serve to increase the pong.
Paul Fisher, an Isleworth ward councillor, told the Civic Centre meeting: "This has been going on for years now. Four years ago they were told to get their case in order but they are no further up the road than they were then.
"Thames Water want to do all this work with total disregard for the community."
The plans will see Mogden's capacity increase from 690 million to 1,064 million litres per day.
A spokeswoman later told the Chronicle: "We take our environmental responsibilities very seriously and are committed to improving the quality of the Tidal Thames.
"We will continue to work closely with the council and provide them with the extra information they need.
"The proposed improvements at Mogden sewage treatment works will enable us to fully treat more of the existing flows before returning them to the river, significantly reducing the amount of storm sewage overflowing into the Tidal Thames.
"This will dramatically improve the quality of the river for both the aquatic life and those who use the river recreationally."