Residents of a Surrey village have expressed concerns over flooding and say the village "can't cope", amid two planning applications being submitted to build more houses.
Alfold, close to the border with West Sussex, currently has tankers operating in the village to "protect customers' properties and the local environment", said Thames Water.
The village, which has flooded before, now has 450 properties but planning applications have been submitted over the past few years for between 100 and 900 new homes.
Wates Developments said its proposal would meet a housing need, while developer Thakeham said it was aware of drainage issues and would "continue to engage with Thames Water" and the local council.
Peter Foy, a resident and member of the Alfold Resilience Group, told BBC Radio Surrey: "The pumping station was built in the 1950s and was built for a village half the size it currently is."
"Currently, residents are seeing flooding of water, including sewage water, in gardens and houses.
"The network cannot cope with the 2025 size of the village without investment."
David Martin, who has lived in the village for 27 years, said there had been infrastructure problems "from the day I moved in".
He said: "It's a public health concern with sewage and we are now talking about putting in more houses - the system will fail, it is already failing."
Thames Water is using tankers to remove sewage "24 hours a day", according to Martin.
"Some people living next to the site probably don't get a wink of sleep."
He added: "It beggars belief someone thinks it is a good idea to put more houses in."
Local MP Jeremy Hunt said on Facebook that it was a "really challenging situation" and that the tankers were "extremely disruptive".
He told the BBC the village was "becoming collateral damage in a planning system that local people feel increasingly powerless to influence" and that it "defies belief" that further development could be planned.
A Thames Water spokesperson added: "Recent heavy rainfall, river flooding, and high groundwater levels have put significant pressure on the wastewater network.
"The tankers are in place to safely manage these excess flows and prevent flooding or pollution.
"We apologise to residents for any disruption and are grateful for their patience while we continue this essential work."
Developers who want to build on the site said there was "desperate need" for housing in the town.
A spokesperson for Wates Developments said: "We have worked in partnership with the local authority to develop a proposal that planning officers have recommended for approval as it will make a substantial contribution to meeting that need."
Tristan Robinson, from developer Thakeham, said it was "aware of issues with foul water drainage in Alfold", adding "while we remain actively engaged with Thames Water, it is their responsibility as the statutory undertaker to carry out any necessary upgrade works and provide capacity for future housing".
"We will continue to engage with Thames Water, the local community and Waverley Borough Council as the scheme moves through the planning process, in order to provide much-needed quality new homes in Alfold," he added.