NI Water has issued an update to Belfast City Council, revealing that decades of underinvestment in the city's wastewater infrastructure have reached a critical tipping point.

The utility provider confirmed that major elements of the Living With Water Programme (LWWP)—a flagship £1.9 billion plan to modernise Belfast’s drainage—have been paused due to funding cuts during the current PC21 price control period.

The constraints are now directly impacting the city's "delivery readiness" for 2026. According to NI Water, many proposed housing developments and commercial projects in Belfast are currently unable to proceed because the overcapacity network cannot support new connections.

The presentation to councillors detailed a network under severe strain, exacerbated by recent extreme weather events like Storm Chandra in late January 2026:

- Storm Overflows: Of the 192 overflows in Belfast, 156 (over 80%) are classed as unsatisfactory, contributing to recurring pollution.

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- Environmental Impact: Wastewater discharges have been identified as the primary source of nutrient pollution in Inner Belfast Lough, leading to algal blooms that threaten both local ecology and socio-economic activity.

- Development Moratoria: While some small-scale funding has unlocked capacity for approximately 5,000 properties since 2024, the broader "moratorium" on new connections remains in place for much of the city.

Despite the pausing of major upgrades, NI Water is progressing £91 million worth of essential maintenance across 30 active schemes in the city. Key projects include:

• £16.9 million total for base maintenance at the main Belfast Wastewater Treatment Works.

• £6.7 million for stormwater storage at Glenmachan Upper Falls.

Dr Stephen Blockwell, Head of Investment Management at NI Water, stressed that the focus must now shift to the PC28 period (2028–2034).

"Short-term injections of funding can help in the immediate term, but they do not provide a sustainable solution for critical infrastructure," he stated. NI Water estimates that £7 billion is required across Northern Ireland to achieve full environmental compliance and resilience.

The Wastewater Infrastructure Group, representing Northern Ireland’s construction and business sectors, has renewed its call for an Infrastructure Levy. The group estimates that the funding gap for 2026–2030 remains at £1.36 billion, a bottleneck they claim is preventing over 6,000 homes from being built and risking the loss of 2,740 construction jobs.

The group proposes a levy averaging £1.25 per week per household to create a stable, multi-year funding model, arguing that the current reliance on single-year government budgets is "not fit for purpose."