04/10/2025
⚠️ Update – 7 October 2025, 12pm ⚠️
Good news! The boil water notice in place for north-east Hamilton and parts of Waikato District in Gordonton and Puketaha has been lifted.
We’ve had a third day of water testing that has shown no signs of E. coli in any parts of our network and confirms that the water is once again safe to drink.
There are some steps properties in those areas need to take before using the water again as you normally would:
🚰 Run all cold taps for five minutes
☕ Run clean water through appliances like coffee machines, water dispenser and ice machines
🧊 Dispose of any ice
💧 Maintain water filters according to the manufacturer’s advice (if you have one)
♒ If you have a header tank for drinking water, empty and refill
♨ Hot water tanks do not need to be refilled.
💦 Properties on trickle feed supply or a water storage tank need to take one additional step. More info 👉 www.hamilton.govt.nz/boil-water-notice-for-rototuna
Please let your whaanau, friends and neighbours know they no longer need to boil water and about these steps. 👆
Thank you for your patience as we worked as quickly as we could to address this issue.
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⚠️𝐁𝐨𝐢𝐥 𝐖𝐚𝐭𝐞𝐫 𝐍𝐨𝐭𝐢𝐜𝐞 𝐟𝐨𝐫 𝐑𝐨𝐭𝐨𝐭𝐮𝐧𝐚⚠️
Hamilton City Council has issued a Boil Water Notice for the Rototuna Water Supply Zone after a single confirmed test result today (Saturday 4 October) which showed the presence of E. coli in a water sample from the Rototuna reservoir.
There have been no other positive tests at the site, and testing at other reservoirs has not detected E. coli. The notice applies to around 12,000 properties and 29,000 residents in Rototuna.
𝐑𝐨𝐭𝐨𝐭𝐮𝐧𝐚, 𝐅𝐥𝐚𝐠𝐬𝐭𝐚𝐟𝐟, 𝐚𝐧𝐝 𝐩𝐚𝐫𝐭𝐬 𝐨𝐟 𝐐𝐮𝐞𝐞𝐧𝐰𝐨𝐨𝐝:
If you live in the Rototuna Water Supply Zone, you must boil tap water before using it for drinking, cooking, or brushing teeth. The affected area is shown in pink on the map.
𝐖𝐚𝐢𝐤𝐚𝐭𝐨 𝐃𝐢𝐬𝐭𝐫𝐢𝐜𝐭 𝐂𝐨𝐮𝐧𝐜𝐢𝐥 𝐫𝐞𝐬𝐢𝐝𝐞𝐧𝐭𝐬:
A small number of residents in Gordonton and Puketaha are also affected. These homes are supplied via the Greenhill bulk supply point, including those on the on-demand supply and rural trickle feed network. These residents must also boil water while the notice is in effect.
Hamilton City Council’s Unit Director Three Waters, Maire Porter, says the result came from routine testing and prompted immediate action:
“Although this is a single test, we take any adverse result extremely seriously and have specific response processes we follow. Our initial response is precautionary, and we act quickly so we have a team ready to deal with any issues identified.
An incident management team has been established, and we will be working closely with Taumata Arowai and the Ministry of Health on next steps. Council’s website and social media channels will carry updates as our investigations continue.”
𝐖𝐡𝐚𝐭 𝐲𝐨𝐮 𝐧𝐞𝐞𝐝 𝐭𝐨 𝐝𝐨:
• Boil tap water before using it for:
• Drinking
• Cooking or preparing food
• Brushing teeth
• Continue normal handwashing with soap and water
• Practice good hygiene – E. coli can spread from person to person
• Be especially careful around infants, older adults, and people with weakened immune systems
The Boil Water Notice will remain in place until at least Tuesday, as three consecutive days of clear test results are needed before it can be lifted.
Further updates will be posted on Council’s website and updated on this post.