What Is WaterMark Certification?
WaterMark certification is Australia's nationally recognised product certification scheme for plumbing and drainage products. It is administered jointly by the Australian Building Codes Board (ABCB) and SAI Global, and it applies to any product that forms part of, or connects to, a building's plumbing or drainage system, including water filters, housings, fittings, membranes, and associated pipework.
To earn WaterMark certification, a product must pass independent laboratory testing to demonstrate that it meets three core requirements. First, it must not leach harmful materials, including heavy metals, plasticisers, or biofilm-forming compounds, into the potable water supply. Second, it must demonstrate structural integrity under normal and elevated operating pressures as specified in the relevant Australian or New Zealand standard. Third, it must comply with the applicable AS/NZS product standard for its category, for water filters, this typically includes AS/NZS 3497 and related standards covering performance, labelling, and materials.
Each WaterMark certified product carries a unique licence number on its housing or packaging. This licence number can be verified at any time through the publicly accessible WaterMark Product Database, maintained by SAI Global at watermark.saiglobal.com. If you are buying a water filter for professional installation, you should be able to find the product's licence number before it ever goes into your home.
WaterMark is not limited to water filters alone. It covers every plumbing product category, from tapware and fittings through to water heaters and drainage components. The water filtration sector is simply one of the most commonly misunderstood areas, because the retail and online marketplace is flooded with non-certified imported products that look the part but have never been tested to an Australian standard. That gap between appearance and certification is exactly where consumer risk sits.
Under the Plumbing Code of Australia and each state's plumbing regulations, including the NSW Plumbing and Drainage Act, it is a legal requirement that only WaterMark certified products be installed in a building's water supply system. A licensed plumber who installs a non-certified product is in breach of their licence conditions and the plumbing code, and faces significant professional and financial consequences if that installation is later identified during an inspection or insurance claim.
What Is NSF Certification?
NSF certification is the international standard for water quality and safety performance. It is issued by NSF (formerly the National Sanitation Foundation), an independent global standards organisation founded in 1944 and recognised by regulatory bodies including the United States Environmental Protection Agency, Health Canada and the World Health Organization. NSF develops and maintains the family of NSF/ANSI standards that govern how water treatment products are tested and certified.
Where WaterMark answers the question can this product legally be installed in Australia, NSF answers the question does this product actually do what it claims. A water filter can hold WaterMark certification (confirming materials safety and plumbing compliance) without ever being independently tested for filtration performance. NSF certification closes that gap. It is the international benchmark for verifying that a system actually removes the contaminants it claims to remove.
The NSF/ANSI standards most relevant to residential water filtration are NSF/ANSI 42 (aesthetic effects, chlorine, taste and odour reduction), NSF/ANSI 53 (health effects, lead, cysts, VOCs and other contaminants with established health concerns), NSF/ANSI 58 (reverse osmosis systems, total dissolved solids and contaminant reduction performance), NSF/ANSI 401 (emerging contaminants, pharmaceuticals, pesticides and personal care products) and NSF/ANSI 372 (lead-free materials for products in contact with drinking water). Each standard prescribes a specific testing methodology, contaminant challenge levels, and minimum reduction thresholds that a product must achieve to earn certification.
To earn and keep NSF certification, a product must pass independent laboratory testing against the relevant NSF/ANSI standards, undergo annual unannounced manufacturing facility inspections, and submit to ongoing product re-testing. NSF maintains a publicly searchable certified product database at nsf.org so anyone can verify a product's certification status, the standards it is certified to, and the contaminants it is certified to reduce. This level of independent verification is what makes NSF the global benchmark for water filtration performance.
In the Australian market, NSF certification is voluntary, it is not legally required. That is why many local installers stop at WaterMark and never confirm whether the systems they install have ever been independently performance-tested. Filters For You has chosen to install only systems carrying both certifications, because Australian legal compliance and verified water-quality performance are two different things and both matter to a family relying on filtered water at home.
WaterMark vs NSF, How They Differ and Why You Want Both
The two certifications cover different parts of the same problem. WaterMark certifies the plumbing product itself, its materials, its structural integrity, its compliance with Australian standards for products in contact with drinking water. NSF certifies the filtration system's performance, what it actually removes, how well it removes it, and how consistently it does so over its rated service life.
A WaterMark-only system is legal to install but its filtration claims are taken on the manufacturer's word. A NSF-only system has verified performance but may not be legal to install in Australia without additional certification. A system carrying both is legal to install in Australia AND independently verified for filtration performance, which is the standard Filters For You has chosen to apply to every system it installs.
What Brands Does Filters For You Install?
Jean-Paul installs water filtration systems from a carefully selected group of brands, all of which carry valid Australian WaterMark certification and international NSF certification across their product ranges.
High Performance Filtration (HPF) is the brand behind the flagship HPF-3 Whole House Filtration System. HPF is an Australian brand manufactured to Australian plumbing standards. The HPF-3 carries WaterMark certification covering the system housing, inlet and outlet fittings and filter media assembly, and NSF certification covering the filtration performance of its media. It is the most robust whole-house solution Jean-Paul installs, and it is his most-recommended product for Sydney homeowners with accessible mains water connections.
Filter Systems Australia (FSA) is the manufacturer of the Pure range, which covers the full under-sink and reverse osmosis product lineup including the Pure Essential, Pure Plus+, Pure Compact, Pure Premium, Pure Advanced, and Pure Luxe. Every product in the Pure range carries WaterMark certification for Australian plumbing compliance and NSF certification against the relevant NSF/ANSI standards for filtration performance. FSA is a respected Australian water treatment specialist and the Pure range represents the strongest value proposition in the under-sink and RO segment.
Puretec is one of Australia's largest water treatment specialists, with a broad range of WaterMark and NSF certified products spanning residential and light commercial applications. Jean-Paul selects Puretec products for specific applications where their product range is the optimal fit for the customer's needs.
Zip manufactures commercial and residential instant hot, cold and filtered water systems, all WaterMark and NSF certified for the Australian market. Billi produces premium under-bench instant hot filtered water systems, also WaterMark and NSF certified, positioned at the premium end of the residential and commercial market. Jean-Paul can supply and install both brands where they are the right fit for the customer's requirements. Every brand Jean-Paul installs has been personally verified for valid current WaterMark and NSF certification before he adds it to his range.
WaterMark vs Non-Certified Filters, The Risk of Going Cheap
Online marketplaces are full of water filter systems at price points that seem too good to be true, and in most cases, they are. The gap between a $150 imported filter and a $550 WaterMark certified system is not just price. The gap is safety, legality, and liability.
Non-WaterMark certified filter housings, especially those manufactured from low-grade plastics without AS/NZS testing, carry a documented risk of leaching harmful materials into drinking water. This can include plasticisers such as BPA and related compounds, trace heavy metals from dye pigments and stabilisers, and biofilm-forming compounds from poorly manufactured internal components. The irony is profound: a homeowner who buys a cheap non-certified filter specifically to improve their water quality may end up introducing new contaminants that were never present in their tap water.
From a legal and insurance perspective, the consequences are equally serious. Under NSW plumbing regulations, installing a non-WaterMark certified product in a potable water line is a breach of the Plumbing Code of Australia. A licensed plumber who installs such a product risks their licence. In NSW, a non-certified plumbing product installed in a potable water line is a reportable issue if discovered during a building inspection, can affect insurance claims, and may need to be removed at the owner's cost.
The $200 saving on a cheap non-certified filter can very quickly become a $2,000 or greater problem. Jean-Paul does not install non-WaterMark certified products. If a customer arrives with a filter they have sourced themselves, his first step is to verify its certification. If it is not certified, he will not install it, and he will explain exactly why, without pressure, so the customer can make an informed decision about upgrading to a certified system.
How to Verify WaterMark Certification
Every WaterMark certified product carries a unique licence number, typically printed or embossed on the product housing, packaging label, or technical datasheet. The licence number follows the format WM-XXXXXX. You can verify any WaterMark licence number at the WaterMark Product Database maintained by SAI Global, search at watermark.saiglobal.com. The database is publicly accessible and free to use. A legitimate certified product will return a clear result showing the licence holder, product category, and applicable standard.
Jean-Paul is able to provide WaterMark licence details for any product he installs. If you want to verify a system before booking, call 0430 546 749 and he will provide the licence number directly.
