What is a Water Compliance Certificate?

A water compliance certificate certifies that your property meets certain energy and water usage requirements as outlined by the RTA (Residential Tenancies Authority). It can only be supplied by a registered and licensed contractor plumber such as RTL Plumbing. Water Compliance Certificates are required by any landlord who wants to charge their tenants for water usage.


A property is considered water efficient if certain water fixtures meet these standards:

Water efficient devices

Minimum standard

Internal cold water taps and single mixer taps                                                                                                                                                A maximum flow rate of 9 litres per minute


A maximum flow rate of 9 litres per minute
ToiletsA dual flush function not exceeding 6.5 litres on full flush and 3.5 litres on half flush and a maximum average flush volume of 4 litres (based on the average of 1 full flush and 4 half flushes)

How long does the Water Compliance Certificate last?

Once you’ve received the compliance certificate, it is valid and does not need to be renewed unless requested by your tenant because they no longer think that your property is fully water efficient compliant. This could be because of an undetected water leak and higher than normal water bill or as simple as change in shower head!

What is Included in a Water Compliance Inspection?

When RTL Plumbing inspect the property for water usage compliance, we check:

  • Taps
  • Shower heads
  • Toilets

Only internal cold water taps installed over a hand basin, kitchen sink or laundry trough (including single mixer taps) need to be water efficient. Other taps such as bath tub taps, outside taps for the garden, or taps which supply washing machines or dishwashers do not have to be water efficient to meet the requirement.

Not Water Compliant?

RTL Plumbing can update your property’s plumbing and complete a Water Efficiency Certificate at the same time. We can take simple steps to achieve your water compliance certificate:

  • upgrading tapware and outlets or
  • install flow restrictors or restricting aerators to taps and showers or
  • installing flow restrictor fittings behind the spouts or
  • install water efficient toilet(s)