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Rainwater Tank Installation Certificate

The Australian Rainwater Tank Installation Certificate documents the installation and commissioning of a rainwater harvesting system, confirming compliance with AS/NZS 3500 and the relevant state government guidelines for rainwater tank installation. Rainwater tanks are widely mandated or incentivised in Australian states and territories as part of water conservation policies, and councils in areas subject to water restrictions often require certified installation before connecting tanks to toilet, laundry, or garden irrigation supplies.

AS/NZS 3500.1 (Water Services), state rainwater tank installation guidelines, local council requirementsValid: No fixed expiry — attached to the installation

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Sample Rainwater Tank Certificate certificate

Sample Rainwater Tank Installation Certificate certificate created with CertBox, showing the professional PDF layout with property address, client details, and installation date, tank make, model, material, and capacity (litres), pump make, model, and type

Sample Rainwater Tank Certificate with fictional data. All personal details shown are fake.

What it covers

  • Property address, client details, and installation date
  • Tank make, model, material, and capacity (litres)
  • Pump make, model, and type
  • Overflow routing and first-flush diverter details
  • Uses supplied (toilet flushing, laundry, garden, external only)
  • Cross-connection prevention measures
  • Water quality treatment (UV, filtration) if applicable
  • Plumber licence number and commissioning signature

Who needs a Rainwater Tank Certificate?

Licensed plumbers installing rainwater tank systems
Homeowners connecting tanks to internal fixtures
Builders on new homes with mandatory tank requirements
Councils and developers with BASIX or STORM requirements

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Frequently asked questions about Rainwater Tank Certificate

Is a plumber required to connect a rainwater tank in Australia?
Yes, in most states connecting a rainwater tank to internal fixtures (toilet flushing, laundry, hot water) requires a licensed plumber. Connecting a tank to an outdoor tap or garden irrigation only may be exempt in some jurisdictions, but internal connections must be made by a licenced plumber to protect against cross-contamination with the drinking water supply.
What is a first-flush diverter and is it required in Australia?
A first-flush diverter diverts the initial runoff from a roof after a rain event — which carries the most contamination from dust, bird droppings, and debris — away from the tank. First-flush diverters are required or strongly recommended by most Australian state health and plumbing guidelines when tank water is used for internal purposes.
What is BASIX and how does it relate to rainwater tanks in NSW?
BASIX (Building Sustainability Index) is the NSW Government's sustainability assessment tool for new homes. Many BASIX assessments require the installation of a rainwater tank connected to specific uses (e.g. toilet flushing) to achieve the required water reduction target. A licensed plumber must install and certify the connection.

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