New Zealand's water infrastructure has been rated among the most urgent climate risks facing the country, according to the 2026 National Climate Change Risk Assessment (NCCRA) published on 7 May by He Pou a Rangi Climate Change Commission, the independent statutory body advising the government on climate action. Of the 37 risks assessed, water infrastructure is projected to be the first to reach an "extreme" severity rating within the next 25 years, under both warming scenarios considered.
The assessment covers the full water cycle: drinking water pipelines exposed to river and surface flooding, supplies stressed by drought and declining water quality, and wastewater and stormwater networks threatened by sea-level rise and more intense rainfall. The risk is compounded by the fact that much of the existing infrastructure is already in a degraded state. For communities, this could mean more frequent service interruptions, boil water notices and burst pipes, with knock-on effects for public health and business productivity. In the most exposed areas, some communities could eventually face the withdrawal of services altogether.
The cost of inaction
The NCCRA rates water infrastructure as having "significant gaps" in policy coverage and "insufficient" readiness to implement existing policies, while its potential to reduce other climate risks is rated "high", the strongest category in the assessment. The broader economic exposure is illustrated by the scale of flood risk across the country: approximately 556,000 buildings are currently exposed to inland flooding, with a combined replacement value of NZ$235 billion (about US$140 billion), a figure the Commission uses to underline the systemic stakes of failing to act on climate hazards.
Recent research cited in the report finds that 97% of government expenditure on natural hazards since 2010 has gone to disaster response and recovery, with only 3% directed at resilience building. Climate Change Commission Chief Executive Jo Hendy described this as an imbalance the country cannot afford to sustain: "By getting it right at the national level, and turning our focus to building climate resilience, we can break the cycle of react and recover."
A reform window
New Zealand's water sector has been in significant legislative flux. The current government's Local Water Done Well programme, enacted through three pieces of legislation between 2024 and 2025, replaced the previous administration's centralising Three Waters approach. Both reform efforts have been driven by longstanding underinvestment in ageing infrastructure and the growing cost of bringing services up to standard. The new framework restores local council ownership and establishes the Commerce Commission as economic regulator for water services for the first time, with mandatory information disclosure requirements coming into force from 2026.
The NCCRA frames this reform process as a critical opportunity to embed climate resilience directly into how water services are planned, funded and delivered, rather than treating it as a governance question alone. National engineering design standards for drinking water, wastewater and stormwater infrastructure are currently being developed by the Water Services Authority. Under the Climate Change Response Act 2002, the Minister of Climate Change must respond to the NCCRA within two years with a new national adaptation plan addressing the most significant risks identified. The Commission's next progress report on adaptation is due by August 2026.
