Something significant happened beneath Auckland this winter. After years of planning, construction and tunnelling deep below the city, the Central Interceptor became fully operational. Most Aucklanders will never see inside it, but its impact will be felt above ground: fewer wastewater overflows, cleaner waterways and a more resilient network for a growing city.

Even before the full tunnel opened, the section already operating had prevented an estimated 741 million litres of wastewater and stormwater from overflowing into the environment — the equivalent of 300 Olympic-sized swimming pools.

It is a striking example of what infrastructure can achieve, and a reminder that work on this scale is never the effort of one organisation alone. It takes mana whenua, communities, councils, engineers, scientists, contractors and specialists working through complex challenges together. Delivering smarter, together, is essential for what comes next, too.

Auckland is growing, weather patterns are changing, and the cost of building and renewing the infrastructure our city relies on is rising. More than 20,000 kilometres of water and wastewater pipes form part of an interconnected system of treatment plants, pump stations and other essential assets serving homes, businesses and communities. Every part of that system must work together, every day.

That scale brings responsibility. We must be clear about what we prioritise, and where investment will make the greatest difference which is why we are bringing more than 1,000 projects together into nine major infrastructure programmes. Planning them as one connected body of work will help us renew critical assets, add capacity where Auckland needs it most, while improving reliability and environmental outcomes.

We are also looking beyond pipes and concrete. Healthy catchments, waterways, soils and coastal environments all shape how well infrastructure performs. Better data, smart monitoring and technology are helping us identify problems earlier and make more informed decisions.

For households, that means safe, reliable services and greater resilience. For businesses, it means the certainty and capacity needed to operate and grow. For Auckland, it means cleaner waterways and infrastructure designed for the demands of the decades ahead.

Every generation inherits a city shaped by the decisions of those who came before it. Our task is to care for what we have inherited, strengthen it for the people who rely on it today, and prepare the next generation for a thriving, healthy future.