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Water Storage & Septic Tanks

If you want to use the Sustainable Homes package to install water storage or replace your septic tank, there are factors to consider and we provide a list of approved suppliers and installers to contact.

Water Storage and Septic Tank Suppliers

For information on heating options please check the Heatsmart pages regarding financial assistance.

Water Storage & Septic Tanks  

The choice of tank size is selected by owner. Average domestic rain water tanks are 2000ltrs or under. Larger tanks 30,000 L (3m x3m size) cost around $2,800 plus install and consent fees.

The Water Storage component of the programme has a borrowing limit of $20,000. The water storage solutions might also include the cost of system solutions, including pump replacement. HBRC bears no liability for the quality of water stored that is sourced from rainwater or bore supply. This will remain the responsibility of the home owner / consent holder.

Septic tanks can cost more than $20,000 but as the borrowing cap is $20,000 over 10 years,  any remaining costs will be paid by the customer.


Improve resilience
Reduce storm water pressure
Reduce ground and surface water takes
Reduce leachate from old septic tanks


Water storage is for the collection of rainwater to create a reserve from bore or reticulated supply. Because of public health requirements, it is not designed as a drinking water supply.

The size of the domestic storage tank most commonly used is 2000 litres or less.

The Building Act G12/A5 2 NZ requires a consent if the tank is connected to the potable/drinking water supply.  It must also have back flow prevention to protect the network supply, and the work must comply with the Building Code as consented by local city or district councils.  If a chartered Engineer has designed the platform, it will be exempt, but any platform must have restraints in place.

Septic tanks should be Oset approved systems and installation should be with accredited suppliers who have completed the relevant training. VTR to be cleared on property sale.


Capturing local rainfall for non-potable purposes (eg your garden) can reduce the demand on the reticulated supply by up to 40% and councils in many areas are already encouraging this. A valuable by-product of rainfall collection is that it also reduces the pressure on stormwater systems. 

Reduces effluent leachate into surface and ground water. Improves local stream/river water quality.       

Increased domestic resilience in emergency event.

Water Storage & Waste Water Tank Approved Suppliers/Installers

EMS,, 021 926 364  

Hagen & Owner Plumbing & Gas,, (06) 843 2100

HB Waste Water Management,, 027 443 8636 (Terry)

Isaac’s, , (06) 857 8807

Laser Plumbing Napier, (06) 843 2474M

M T Carroll (Brendan) , (06) 843 5120

Peak Plumbing & Gas (Grayson),, (06) 877 4512

Rob Findlay,, 027 543 7041

Turfrey,, 0800 182 182


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