Types of water tanks
Rainwater tanks come in different shapes and sizes.
They can also be made from varying materials, including plastic or concrete.
If you are already connected to the centralised water network and are short of space, slim-line tanks are a good option. They can fit along the side of your house, fence, garage or other structure.
Bladder tanks are designed to fit under floors and decks, making use of previously unused space.
For more information, see
Rainwater tank suppliers.
Retention tanks retain water for future use.
|Non-potable (non-drinking water)
||Outdoor use, such as washing a car or watering garden
||Non-potable (single use) retention tank or rain barrel
Outdoor use, toilet flushing and laundry use
Non-potable (single use) retention tank
|Potable water (full drinking water supply)
Outdoor and indoor uses, including kitchen and bathroom water supply
Water must be purified
Most suitable for households NOT connected to centralised water network
|Potable (or complete supply) water retention tank
Stormwater detention tanks
Detention tanks capture rainwater and store it, slowly releasing it back to the stormwater network.
This contributes to reducing the flow of stormwater runoff and minimises the negative effects on the environment, such as bank erosion, sewer and stormwater overflows.
A detention function can be added to a retention tank to make it a dual-purpose system.
Auckland Design Manual website for more information on stormwater management devices.
Guide to choosing a rainwater tank
Read our practical guide for information on types of systems, choosing a size, components and what consents you need.