Site Containment Backflow Prevention Standard

Site Containment Backflow Prevention Standard

This Site Containment Backflow Prevention Standard has been prepared for plumbers, consultants and property owners when designing and installing connections to Hunter Water's water supply. The Standard is applicable to both new and existing water supply connections.

The requirement for site containment backflow prevention is nominated in various laws and regulations including:

Whilst the standard identifies numerous onsite operations and configurations Hunter Water can amend and/or require increased site containment backflow prevention on an individual property basis.

Hunter Water manages site containment backflow prevention devices only. It is the responsibility of the property owner for zone and individual backflow prevention.

To download a copy of the Site Containment Backflow Prevention Standard click here

Site Containment Backflow Prevention Standard

PREMISE TYPE/CATEGORY  EXAMPLES (not limited to)  HAZARD
Alternate Water Supply bore water, dams, reclaimed stormwater or recycled waste water (black or grey reuse)  High
Below Ground Rainwater Tank fully buried, partially buried, commercial, industrial, 2+ residential strata units - 25mm+ water service High
Premise with Restricted Access defence force, heavy industry, universities, chemical plants/processing or similar, petroleum processing plants or similar, radioactive reactor/processing or similar, major shopping centres, private network utilities, power stations and sub stations, coal mines, metal recyclers, water treatment works, prisons and corrective centres, airports High
Water Front Facilities piers, docks, marinas, fishing co-ops, oyster/prawn/fish farmers High
Sewerage Treatment/Disposal/Recycling sewerage treatment works, sewage lift stations, sewage lift stations residential (with well washers), sanitary depots, recreational vehicle sewerage dump points, effluent re-use plant High
Automotive  petrol stations, vehicle, plant and plant equipment washing, caravan parks with sanitary dump point High
Health Facilities hospitals, mortuaries, funeral parlours with embalming, day surgery premises, pathology laboratories, general laboratories, dental surgeries - with direct water connection to dental chairsnursing homes with dirty utility rooms - sterlisers, pan washing, medical/dental - autoclaves, sterilisers, bidets - residential/commercial/industrial High
Food Processing and Preparation abattoirs, food processing (where high hazard is identified - clean in place systems) High
Metal Finishing galvanising, electro plating, chrome plating, zinc plating, powder coating High
Agricultural  drinking troughs, crop farms, hydroponic operations, organic, veterinary surgeries, pest control facilities High
Trade Waste oil separator (process, wash day), prison sanitary grinder system, dilution pit, commercial laundries, industrial silt trap, Daf unit/collection tank with pH correction and/or coagulant dosing  High
Fire Control hydrant with chemical injection, hydrant within high hazard area, fire hose reel/s within high hazard area, sprinkler with chemical injection, below ground hydrants High
Sporting/Recreational golf course, irrigation with pump system or fertiliser/chemical injection, irrigation with below ground sprinklerheads ("pop up") High
Local Government - Council, Public Utility public swimming pool - with chemical storage, works depots, waste disposal facilities - garbage dumps High
Development Construction temporary construction water services for 3+ residential units, commercial and industrial developments (rpzd to be registered with hunter water upon connection and unregistered with hunter water upon disconnection) High
Local Government - Council, Public Utility public swimming pool - no chemical storage, mixed use buildings - offices etc, secondary school laboratories - dilution pit, spas, fountains Medium 
Food Processing and Preparation food & beverage processing plants Medium
Fire Control commercial/industrial premises with sprinkler service, commercial/industrial premises with hydrant service,commercial/industrial premises with fire hose reel/s, residential fire services identified as medium risk Medium
Recreational  caravan parks without sanitary dump points Medium
Trade Waste grease trap, silt trap  Medium
Above Ground Rainwater Tank 3+ strata units  Medium
Below Ground Rainwater Tank
* Accepting Roof Water Only
* Adequate Vermin Proofing
* Require inlet and outlet
single residential stand-alone dwelling 20mm water service Medium
20mm Vented Dual Check Valve
Sewage Lift Station single residential stand-alone dwelling 20mm water service (no internal well washers and with or without potable water flushing via an external air gap) Medium
20mm Vented Dual Check Valve
Alternate Water Supply
(Residential)
* No interconnection with drinking water supply
residential bore water, residential reclaimed stormwater Medium
20mm Vented Dual Check Valve
Above Ground Rainwater Tank single stand-alone residential dwelling, strata duplex Low
Commercial hairdressers basins or troughs Low
 MINIMUM SITE CONTAINMENT BACKFLOW REQUIREMENTS
32mm water meter testable device - minimum double check valve (DCV)
40mm water meter testable device - minimum double check valve (DCV)
50mm water meter testable device - minimum double check valve (DCV)
80mm water meter testable device - minimum double check valve (DCV)
100mm water meter testable device - minimum double check valve (DCV)
150mm water meter testable device - minimum double check valve (DCV)
200mm water meter testable device - minimum double check valve (DCV)
single check detector assembly not to be used within hunter water's area of operations

NOTE:

  1. Where multiple processes occur on a site, the site containment backflow hazard rating will be equal to, or greater than, the highest identified hazard
  2. The nominated listings above may be varied if the onsite operations have not been clearly identified. In these cases the hazard rating will be considered "high" until proven otherwise
  3. Hunter Water only recognises "mechanical" site containment backflow prevention devices
    (a) Low Hazard - Dual Check Valve (minimum)
    (b) Medium Hazard - Testable Double Check Valve (minimum)
    (c) High Hazard - Testable Reduced Pressure Zone Device (minimum)
  4. AS2845.3.2010 (Clause 2.2.2a and Table 2.1) requires all testable site containment backflow prevention devices to be certified by an accredited backflow prevention device tester on an annual basis, with the certification reports submitted to Hunter Water