Information for Plumbing Contractors

Our aim is to provide plumbers with a one-stop shop for all plumbing information.  In this section you will find:

Helpful Information

    • Fees and Charges
    • Water & Sewer Design Manuals
    • Trade Waste
    • Standpipes
    • Dial Before You Dig Service
    • Minor Works Water Services Standard Property Service

This information is for plumbing and irrigation contractors engaged to work at NEV. It is important that it is read and understood prior to commencing work.


NEV Water has recently rechead agreement with Central Coast Council to connect to their waste treatment services. The civil engineering work necessary to make this connection is currently being designed. we expected to complete the connection in the foreseeable future.

At present waste water is being collected in our holding tanks. We have sufficient storage capacity to manage current flow levels.

It should be noted that wastewater is NOT suitable for drinking purposes. 

What precautions are in place to protect the health of workers on-site?

The NEV site has a dual pipe system, which means the non potable water is transported around the site in a separate (purple coloured) pipe system to the drinking water (‘mains water’).

As the non potable water service is completely isolated from the mains water supply, it’s very unlikely you will ever accidentally come into contact with the non potable water.

Instructions for plumbing contractors

You can help by following the guidelines below, which will keep our water recycling systems running smoothly.

Please do

Take notice of any signs on-site and follow instructions to keep you and workmates safe.

Please don’t

Don’t drink the non potable water supply, it is not tested for human consumption.

Don’t put any of these materials down the drain:

  • Bulk detergents
    • Fertilisers
    • Chemicals
    • Pharmaceuticals
    • Silicon or silicon based products
    • Bleach
    • Paint or paint thinners
    • Turps
    • High-foaming degreasers
    • Windex
    • Draino or caustic soda


Our water distribution and reticulation systems are designed and constructed in accordance with:

the relevant codes for:

    • building
    • plumbing
    • public health
    • environmental discharge
    • the National Plumbing and Drainage Code, and
    • the relevant local Recycled Water Plumbing Guidelines.

All non potable water pipe installations and markings are in accordance with the relevant codes and guidelines.

Under no circumstances is there to be a cross-connection between the purple non potable water system and the mains drinking water service. You must ensure any alterations to plumbing systems, especially the purple non potable water system, are recorded with the NEV Waterand are in accordance with relevant codes and guidelines.

To print this page click NEV Water – Plumbing & Building Information – Information for Plumbing Contractors – March 2018