Australia and New Zealand

Is WaterMark Required for a Bathtub?

This question comes up in almost every Australian bathtub enquiry, and the answer surprises both sides. Baths are generally excluded from the WaterMark Certification Scheme. The component that carries certification is the waste outlet, not the tub. Buyers who ask a factory for a WaterMark certificate on a bath are often told none exists, conclude the supplier is unqualified, and walk away from a perfectly compliant product.

The short answer

Quick Reference

WaterMark covers plumbing and drainage products; baths are generally on the exclusion list.
The waste outlet is the certified component, and it is usually sourced separately.
Exclusion from WaterMark does not mean no rules: the National Construction Code governs the installation.
Australian Consumer Law guarantees apply regardless of any certificate.
New Zealand has no equivalent mandatory scheme for baths; the Building Code governs the installed result.

A rectangular solid surface bathtub set into a deck

Start here

What WaterMark Actually Covers

WaterMark is Australia's certification scheme for plumbing and drainage products. Its purpose is narrow and sensible: products that connect to the potable water supply or the sanitary drainage system, and whose failure would contaminate water or cause an uncontrolled discharge, must be certified before they are installed.

A bath does neither of those things by itself. It is a vessel. The parts that connect to the drainage system are the waste outlet and the trap; the parts that connect to the water supply are the tap and any hose. Those components are inside the scheme. The vessel that holds the water generally is not.

This is why a factory that makes excellent baths may hold no WaterMark certificate at all, and why that absence tells you nothing about the product's quality or its legality in Australia.

WaterMark targets products connected to water supply or sanitary drainage
Baths appear on the scheme's exclusion list in the general case
The waste outlet and tapware are the certified components
Always confirm against the current schedule rather than an older summary

What Is Certified, and Who Supplies It

A floor drain shown as a plumbing component

In a typical imported bath order the tub and the waste are two separate commercial items, and they frequently come from two different manufacturers. That split matters because it decides who holds the certificate.

If the waste is supplied with the bath, ask which certification it carries and who holds it. If the waste is sourced locally by the importer or fitted on site by the plumber, then the bath supplier has no certification obligation at all and the compliance question moves to the local component.

Confirm whether the waste outlet is included in your bath order
If included, ask for the certification held by the outlet, in the outlet manufacturer's name
If excluded, plan the certified component into your local supply
Do not accept a bath-level certificate that appears to cover a component it does not

The clean way to write this into a purchase order is to name the waste arrangement explicitly: supplied by the factory to a stated specification, or excluded and sourced locally. Ambiguity here creates arguments at installation, not at order.

What Still Applies in Australia

A solid surface bathtub shown with specification information

Exclusion from WaterMark is not a general exemption. Several obligations survive it, and two of them are the ones that actually catch importers out.

The National Construction Code governs the installed bathroom: waterproofing, structural support for the filled weight of the bath, drainage falls, and access. That is the installer's and the certifier's territory, but it constrains what you can specify. A very large bath, filled, is a structural load, and that question belongs at specification time rather than on delivery day.

Separately, if your order includes timber vanities, Australia's illegal logging due-diligence law places obligations on the importer. Species, harvest country and evidence of legality are things you are expected to be able to show, and the supplier is where that evidence has to come from.

Confirm the filled weight and required floor support for the bath you specify
Check the drain position and fall against the installed bathroom, early
For timber items, collect species, origin and legality evidence as the importer
Remember Australian Consumer Law guarantees cannot be contracted away

How New Zealand Differs

A built-in solid surface bathtub in a villa bathroom

New Zealand has no mandatory product certification scheme for baths comparable to WaterMark. The controlling instrument is the Building Code, and the consenting authority is interested in the installed result rather than in a mark on the product: waterproofing, structure, drainage and durability.

Practically, this means a New Zealand buyer is asking a different set of questions than an Australian one. Instead of "what certificate does this carry", the useful questions are about material behavior over time, the substrate the bath sits on, how the waste is connected, and what happens if a surface is damaged in service.

Expect no product certificate requirement for the bath itself
Direct the technical conversation to the installed detail
Ask about repairability, since a repairable surface changes the long-term risk
Confirm the building consent path with the installer before finalizing the specification

How to Ask a Supplier Without Confusing Everyone

A large share of the friction in Australian bathtub enquiries is a wording problem. "Send me your WaterMark certificate" invites either a wrong document or an unhelpful no. These questions get you further.

Is the waste outlet included? If so, which certification does it carry and in whose name?
What is the filled weight of this model, and what floor support does it assume?
What is the drain position and the overflow arrangement, on a drawing?
What is the surface material, and can it be repaired in place if damaged?
For timber items: what species, from which country of harvest, with what evidence?

A supplier who answers those five cleanly is more useful to you than one who emails a certificate scan within a minute of being asked.

Common questions

WaterMark and Australian Compliance Questions

Do bathtubs need WaterMark certification in Australia?

Generally no. Baths appear on the WaterMark exclusion list; the certified components are the waste outlet and tapware that connect to the drainage and water supply. Always check the current schedule for your specific product rather than relying on a summary.

Why does my supplier say they have no WaterMark certificate?

Most likely because none is required for the bath itself. That answer is usually correct rather than evasive. Ask instead about the waste outlet, which is the part inside the scheme.

Does WaterMark exclusion mean there are no rules?

No. The National Construction Code governs the installation, including waterproofing, drainage and structural support for the filled weight. Australian Consumer Law guarantees also apply, and timber items carry illegal logging due-diligence obligations on the importer.

Is New Zealand the same as Australia?

No. New Zealand has no mandatory certification scheme for baths. The Building Code governs the installed result, so the consenting authority looks at waterproofing, structure and drainage rather than at a product mark.

Who is responsible for the timber due diligence, the factory or the importer?

The legal obligation sits with the importer. The factory is where the evidence comes from, so ask for species, country of harvest and supporting documentation before shipment rather than after.

What should I put in the purchase order about the waste?

State explicitly whether the waste outlet is supplied by the factory to a named specification or excluded and sourced locally. Leaving it implied is the most common cause of disputes at installation.

A custom solid surface bathtub in a villa setting

In short

Ask About the Outlet, Not the Tub

Baths are generally outside WaterMark, and a supplier without a bath certificate is usually telling you the truth rather than hiding something. Move the certification question to the waste outlet, where it belongs, and settle in the purchase order whether that outlet is supplied or sourced locally.

Then spend the attention you saved on the things that genuinely decide whether the installation goes well: filled weight and floor support, drain position, waterproofing detail, and for any timber in the order, the legality evidence you are required to hold as the importer.

Certification follows the outlet and tapware, not the vessel
Name the waste arrangement explicitly in the order
Design for the filled weight, not the empty weight
Treat timber due diligence as your own obligation
In New Zealand, direct the conversation to the installed detail

Supplying bathtubs into Australia or New Zealand?

Talk to WNS Global

Tell us the models, quantities and whether you want the waste outlet supplied or excluded. We will give you filled weights, drain positions and dimensioned drawings for the specific models, and say plainly which components carry certification and which do not.