Step-by-step testing guide for RPZD, DCV and PVB devices — plus hazard assessment when you need to pick the right device.
AS/NZS 2845.1 classifies cross-connections between potable water and non-potable sources by hazard level. High-hazard connections — cooling towers, medical equipment, chemical dosing systems — require an RPZD or air gap. Medium-hazard connections like pools, irrigation, and fire services require a double check valve. Low-hazard residential connections use a dual check valve.
State water authorities require testable backflow prevention devices to be registered within a set window after installation and tested annually. The requirements — registration deadlines, test report formats, licence endorsements — differ by state. This tool shows the specific rules for each state and territory.
Use this on any job involving irrigation, swimming pools, cooling plant, commercial kitchens, fire services with chemical additives, or any cross-connection with a non-potable source. Also use it when a water authority requests a hazard assessment or when writing a compliance certificate for a new backflow installation.