Plumbing and Drainage Standards

The State Government Plumbing and Drainage Standards apply to all publicly operated water and sewerage reticulation schemes and incorporates the National Plumbing Standard within the Australian Standards.

Connecting raw water supplies to filtered water supplies is illegal as it may cause cross contamination of the public water supply. Cross contamination prevention devices may be installed by the Council for both residential and industrial properties operation to ensure the safety of the public water supply.

Connecting roof water and rain water tanks with a public water supply is prohibited. Rain water tank plumbing must be independently piped to taps and cannot be interconnected with the town filtered water. Restrictions apply if rain water tanks need to be topped up by a public water supply and these can be discussed with Council.

Hot Water Systems

Limitations on the use of plastic plumbing material may apply when installing a hot water system and a minimum use of 1m of metal plumbing is required on either side of the unit.

Hot water units require a pressure relief valve to limit sediment build up in the unit. Regular venting of these valves is recommended to reduce calcification and the risk of the hot water unit exploding. Inlet filters are also strongly advised.

Roof mounted solar hot water systems may add significant weight to a roof structure and may require additional structural support. Advice from a suitably qualified roofing specialist is recommended before installation of the system, particularly in older houses.

Water Tanks

Water tanks should not be located on property boundaries where any overflows may impact the neighbouring property. Council recommends using a “first flush” diverter to collect and divert initial debris runoff from the roof to the garden or lawn areas to prevent water contamination. Diverters should be located away from buildings to limit any rising damp issues to the structure.

Additional considerations when installing a water tank

  • Ensure tank is properly sealed to minimise the breeding of mosquitos and other insects.
  • A drainage cock at the bottom of the tank is useful for flushing debris that may accumulate.
  • Certain types of vegetation are toxic to humans and should not be planted near tanks or near roof catchments. EG. White Cedar, Oleander trees and Rhus trees. Check your local nursery or Council for a more complete list.
  • Some acrylic roof paints may have an impact on humans. Check with the paint company before repainting.

Information Sheet - Hot Water Systems and Rainwater Tanks