About Tiaki Wai
Tiaki Wai is the metropolitan Wellington water services organisation, jointly owned by Wellington City, Porirua, Lower Hutt and Upper Hutt councils with Greater Wellington and mana whenua. From 1 July 2026 it operates drinking water, wastewater and stormwater across the four cities — the ~6,300 km network, reservoirs and pump stations previously delivered by Wellington Water — plus Greater Wellington's bulk-water supply. Contact Tiaki Wai before excavating near water assets in metropolitan Wellington.
As a council operator, Tiaki Wai is responsible for stormwater, wastewater, drinking water across its district. Anyone planning excavation work - building, fencing, landscaping or trenching - must identify and protect their underground pipes before breaking ground.
Tiaki Wai is one of 14 utility operators active in Wellington. Most building or landscaping work in this area touches multiple operators' networks at once - power, water and communications cables routinely share the same trench. The list further down shows the other utilities you'll likely need to contact alongside Tiaki Wai.
Where Tiaki Wai operates
Before you dig in Wellington
Striking an underground pipe can cause injury, large repair bills and outages for your neighbours. Three steps to do it safely.
- 1
Find every operator that serves your site
Map your worksite on UtilityFinder to find every operator that serves the area - power, water, gas and comms in one view - so you don't miss anyone when sending locate requests.
Create your map - 2
Request a locate from Tiaki Wai
Contact Tiaki Wai and any other operators in your area to confirm the position of their underground assets before excavation.
Locate request page - 3
Mark, protect, dig carefully
Mark the locate paint or pegs on site, hand-dig within 0.5 m of marked assets, and never assume a clear trench means clear ground.
Other utilities serving Wellington
Most building or excavation work touches more than one operator's network. Here's who else you may need to contact.
3 Waters
3
Communications
1Gas
2Fuel pipelines & terminals
2
Other
6
Find every operator serving your site in 30 seconds
UtilityFinder shows every utility operator that serves Wellington - power, water, gas and comms - with contact details and locate-request links in one shareable view. Plan your dig with confidence.
Create your map - free