Mangawhai Wastewater

The Mangawhai Community Wastewater Scheme (MCWWS) Extension Project

Project Overview

The MCWWS services part of the Mangawhai Drainage District through a reticulated network of pipes connecting properties to the treatment plant. A further network of pipes connects the plant to a holding dam on Browns Road Farm.

Disposal occurs through a further network of pipes on the Farm that distributes treated water on fields covering part of available farmland. The capacity of the plant can cater for about twice the number of current connections. Disposal capacity through the current irrigation reticulation is at its limit. In order to increase connections to the plant, the reticulation needs to be extended to other parts of the drainage area and the disposal capacity needs to also increase.

There are a number of options for how the reticulation network is extended, how the capacity for disposal is increased and how the extension is funded.


There is a significant amount of information regarding the system, to the left you can see historical information about the EcoCare system, below are a selection of reports. 

WSP/Opus Reports








Harrison Grierson Effluent Disposal 

Report – Review of Potential Effluent Disposal Option (pub. 15/9/2014)


Kaipara District Council

Mangawhai Effluent Re-use Project

Project Overview

Mangawhai Community Wastewater Treatment Plant (CWWTP)currently produces a treated effluent that meets international standards for beneficial reuse. The criteria given in the Environment Protection Authority Victoria Australia effluent standards for reuse show that the effluent is suitable for use as irrigation on recreational areas, provided that public access is restricted during and immediately following application. This is Class C, which makes it ideal for Golf Course irrigation, where irrigation can be overnight, with several hours before the course is used.

Kaipara District Council (KDC), local iwi and Mangawhai Golf Course (GC) have been in discussion and agree in principle that the community and KDC will mutually benefit by reusing effluent for irrigation.
The main benefits to KDC are;

  • Benefits to community facility
  • 15 ha of land not required for irrigation and associated infrastructure
  • long term potential for greater volumes

The reports below presents the concept of an effluent reuse system for the WWTP.