Water Supply Crisis Puts South East Housing Expansion in Jeopardy
A water company already facing intense scrutiny has delivered a stark warning that its infrastructure can only support a fraction of the new homes planned across a significant portion of the South East of England. South East Water has stated that current housing targets vastly exceed its capacity, raising serious questions about the feasibility of development plans in the region.
Local Plan Targets Clash with Water Infrastructure Reality
Tonbridge and Malling Borough Council is currently formulating a new Local Plan, which aims to allocate land for 19,746 new residences by 2042. This ambitious proposal is expected to increase the local population by over a third. However, a spokesperson for South East Water revealed that, based on their review of the latest housing forecast figures, they cannot accommodate additional growth beyond what was assumed in their Water Resources Management Plan 2024 in areas without a supply-demand surplus.
"Specifically, in the Tonbridge and Malling area, where we currently lack available headroom in our supplies, we would be unable to accommodate any growth exceeding our 2024 forecast assumptions throughout the entire planning period," the spokesperson added. The water authority's own management plan was designed to supply only 6,318 additional homes in Tonbridge and Malling by 2042. The council's proposed target of 19,746 homes represents a staggering 210 per cent increase on this figure.
Councillors Sound Alarm on National Housing Strategy
Councillors at Tonbridge and Malling Borough Council (TMBC) have declared that this warning must serve as a wake-up call regarding the Labour government's plans to build 1.5 million new homes by the end of this parliament in 2029. Cllr Mark Hood, chairman of the Council’s Area One Planning Committee, stated: "The response from South East Water should be a reality check not only for our borough council, but across Kent and Sussex."
"Water is one of our most precious resources - without it, our society grinds to a halt, schools close and farmers’ animals will die – as we have seen in recent months," Cllr Hood emphasised, referencing a calf that died of dehydration at Barland Farm in Tonbridge in January after the farm lost its water supply. He warned, "Kent is sleepwalking into a water crisis, and when the water industry warns us that the situation is unsustainable, we need to sit up and listen."
Cllr Lee Athwal argued that the core problem is not over-ambitious housing targets, but years of under-investment in utilities. "We need more houses, but we need decent infrastructure. It’s time to stop private companies making all the profits while people suffer," she asserted.
Planning System Flaws and Regulatory Pressure
While water companies are statutory consultees when local authorities draft their Local Plans—meaning TMBC must now address South East Water's concerns—they are not statutory consultees for individual planning applications. This critical gap means water supply issues are often never addressed at the application stage; it is routinely assumed that supply is available.
Cllr Hood advocated for change: "The water industry should now be included as statutory consultees for planning applications in the same way that Kent Highways and the Environment Agency are. We have a situation where water companies have a legal duty to connect to new developments - irrespective of whether they have the capacity to supply clean water or to treat their wastewater and prevent the pollution of our streams and rivers."
"Currently, planning applicants are required to demonstrate how they will mitigate the impacts of their extra homes on traffic, school places and even library provision – but not water. This is madness," he added. Under current regulations, planning committees are largely unable to impose conditions preventing construction until clean water infrastructure is in place, though they may consider an exceptional "Grampian condition" for specific applications.
Recent Failures and Regulatory Action
The fragility of South East Water's infrastructure has been starkly exposed over the past year, with widespread supply failures affecting large parts of its network. In January, around 8,000 homes in Tunbridge Wells, Tonbridge, Maidstone and Sevenoaks were left without water, some for days, after booster pumps at storage tanks failed. This necessitated bottled water stations and water shipments by tanker.
The disruptions forced some schools to close, and pupils at Tonbridge Grammar School had their mock International Baccalaureate examinations postponed. Thousands of properties around Tunbridge Wells had already endured a six-day water cut-off at the start of December, an incident Prime Minister Keir Starmer described in the House of Commons as "a serious issue".
Adding to the company's woes, the industry regulator Ofwat recently fined South East Water £22.46 million following a damning investigation into supply failures that left thousands in Kent without water in multiple disruptions between 2020 and 2023. Ofwat calculated that 286,000 customers had been affected in total.
Regional Supply Stress and Long-Term Solutions
South East Water's response to TMBC confirmed that supply issues extend across the region, not just in Tonbridge and Malling. The company stated: "The current supply-demand situation in our Tunbridge Wells, Maidstone and Cranbrook water resource zones is causing significant stress to our supply."
The company did not claim it would never meet extra demand from increased housing, but indicated it would need "to rerun our decision-making process" to identify additional interventions. These could include new supplies, transfers, or increased demand-reduction programs. However, such solutions would not be available until the completion of its next Water Resources Management Plan in 2029.
Nick Price, South East Water's head of water resources, explained: "We update our Water Resources Management Plan every five years. We have started the process of developing the next plan, which will be published in 2029. We will be using the latest housing figures when creating the plan and will therefore accommodate any planned additional properties."
"Our current plan was prepared in 2024 using housing figures derived from the best available information at the time. Consequently, it does not reflect the significant uplift in the Objectively Assessed Housing Need that is now driving Tonbridge and Malling Borough Council’s draft Local Plan, which has risen to 1097 dwellings per annum," he added.
Council Response and Underlying Challenges
A spokesman for Tonbridge and Malling Borough Council said: "Infrastructure capacity – including water supply – is a key issue raised during the Regulation 18 consultation and one we take extremely seriously. South East Water, like all utility providers, have statutory duties regarding supply and we are seeking clarification from them on the points raised in their consultation submission."
"We are also engaging with the government’s housing department to understand any implications for future planning. This is exactly what this stage of the Local Plan process is for: gathering feedback and identifying issues that need further work. We will continue to work closely with all providers to ensure the draft Local Plan is informed by up‑to‑date and comprehensive evidence that reflects the needs of our communities and delivers the infrastructure required to serve new development," the spokesman concluded.
South East Water's Water Resources Management Plan 2024 details that the company used consultants Edge Analytics to calculate future water demand. Predictions involve multiple factors, including climate change, housing and population growth, the rate of consumption per household, and water wastage through leaks. The company noted that household consumption has reduced by an average of 18 per cent with the introduction of water meters, but with over 90 per cent of customers now on meters, there is little leeway for further savings. Social factors, such as increased demand during the Covid-19 pandemic when people worked from home, also play a significant role in shaping water demand projections.
