IAWAI is a publicly-owned water company formed by Waikato District Council and Hamilton City Council. We plan, build, manage and maintain drinking water and wastewater services for communities across Hamilton City and the Waikato District. We also manage stormwater for both Councils.
Why did this change happen?
Last year, Hamilton City Council and Waikato District Council responded to strong direction from the government to make major changes to how water services are delivered. Councils were encouraged to work together to create a larger, more efficient water services organisation that can invest more over time while keeping costs as low as possible. Our region is growing fast — some of the fastest growth in New Zealand. Managing water infrastructure at this scale requires focus, investment, and long-term planning. IAWAI was created so we can do that well, keeping water affordable and reliable for everyone as our communities expand.
Where do we service?
From 1 July 2026, IAWAI will be fully operational and responsible for managing 90,700 drinking water and wastewater connections across Hamilton City and Waikato District.
What changes for you on 1 July?
Short answer: very little in your day-to-day life.
Your water supply stays the same. Your toilet still flushes. Your tap still works. We're committed to a smooth transition so you don't notice a difference. As we transition to new contact numbers and channels, you will still be able to reach our water teams through your normal council contacts.
- Ratepayers in the Waikato District will still receive water meter bills, twice yearly.
- Industrial and commercial water users in Hamilton will also continue to get water meter bills.
- Water and wastewater costs are no longer paid through your council rates, and IAWAI’s water charges are shown separately so it’s clear what you’re paying for.
Our commitment to the Waikato River
IAWAI was created in partnership with Waikato-Tainui, the iwi of this region. We're committed to protecting and restoring the health of the Waikato River and our local waterways. That means every decision we make considers the long-term well-being of the awa (river) and the communities that depend on it — including you.