The size and type of the rainwater collection system that you can install will depend on your individual property and what you want to use the water for.


The easiest system to install is a rainwater barrel. These can be used for watering the garden and don’t require a pump or treatment system. Rainwater is great for your garden because soil doesn’t require water to be treated first.

 What to consider:

  • To collect rainwater from your roof, you will need to connect a diverter to your downpipe
  • Location – the barrel needs to be secure and on a secure slightly raised platform e.g. pavers/pallet as it relies on gravity to work correctly.
  • Managing any overflow – installing a diverter is a good idea to direct overflow back into the stormwater system to reduce ponding on your property.


Check out Eco Matters detailed guide to building your own rain harvesting kit.


 As well as the big DIY stores there are smaller operators that sell rainwater harvesting barrels. 

The list of suppliers* below is just a starters for ten and does not imply that Smart Water endorses or approves them.  Please take the time to do your own research using internet search terms such as ‘rainwater barrel nz’; ‘rainwater harvesting nz’ or ‘rainwater tank’ and the nearest large town where you live e.g. ‘rainwater tank cambridge’. 


*If you are aware of a supplier who you think should be added, please contact us



Rainwater tanks may provide all or some of the household’s water needs.

 We recommend contacting a local rainwater tank supplier to get the right advice on what size and type of tank will best meet your needs on your property. The requirement for whether your tank may need a building consent depends on:

  • the size of the rainwater tank,
  • what you want to use the water for, and
  • your location


Contact your Council’s building consent team to find out more. Hamilton City Council has a practice note that outlines the requirements for rainwater tanks for on-site stormwater management, you can view it here.

 For more information check out the Smarter Homes guide to rainwater tanks.

 Want to see what an installed rainwater barrel actually looks like?

 Go Eco based in Hamilton have established a learning area with an operating rainwater barrel and garden. Contact Go Eco to organise a time to have a look at the system and learn more about what you could install in your own garden. Visit or call on 07 839 4452

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