Best Under-Sink Water Filter Australia (2026)

About six in ten Sydney suburbs get tap water disinfected with chloramine rather than chlorine. Adelaide’s water carries around 300 mg/L of dissolved solids. In the median Melbourne suburb, hardness is 19 mg/L. Each of those calls for a different filter, so the best under-sink water filter in Australia depends on what comes out of your tap.

There is a second thing most buying guides skip. Anything plumbed into the drinking water supply in Australia needs WaterMark certification, and only a licensed plumber may connect it [6]. We checked 13 under-sink water filter systems sold here against the WaterMark product database and the NSF/ANSI certification listings kept by IAPMO R&T, NSF and the Water Quality Association. Six carry WaterMark. Several of the best sellers on Amazon claim to remove fluoride, lead or PFAS without a certificate that covers it.

Our picks at a glance

Pick	System	WaterMark	Certified to reduce	Price
Best overall	Philips AUT9333/79 PFAS Pro	Yes (060212)	Chlorine taste and odour, lead, cysts, PFAS, microplastics	$279
Best to keep your tap	Brita mypure A1C kit	Yes (060031)	Chlorine taste and odour	$310.95
Best reverse osmosis	Waterdrop X8 tankless RO	Yes (032422)	Dissolved solids, chlorine taste and odour	$719.20
Best budget	Shield twin under-sink kit	Yes (maker’s certificate 030064)	None certified	$99.50

Prices are from Amazon Australia and Brita Australia on 24 October 2026. “Certified to reduce” lists only claims that appear on the certifier’s own listing. Detailed reviews follow the city data below.

How We Checked Each Under-Sink Water Filter

We did not test these filters in a lab. We checked the paperwork that decides whether a filter is legal to connect and whether its claims are real.

For each under-sink water filter system we searched the WaterMark product database run by the Australian Building Codes Board, then looked up the performance certificates held by IAPMO R&T, NSF and the Water Quality Association. Those certificates matter more than the box. Since 2021 the Australian standard for drinking water treatment units, AS 3497, has required every performance claim to be certified to an NSF/ANSI standard [5]. A WaterMark certificate shows a product is fit to connect to the plumbing. It does not list what the filter removes.

The standards to look for are short. NSF/ANSI 42 covers taste and odour, mainly chlorine. NSF/ANSI 53 covers health contaminants such as lead and PFAS. NSF/ANSI 58 covers reverse osmosis and dissolved solids. NSF/ANSI 401 covers microplastics and some emerging contaminants, and NSF/ANSI 372 only confirms the parts are low in lead.

Then we matched each type of filter to the water that WaterScore holds for every capital city.

Types of Under-Sink Water Filter System

Under-sink filters come in three layouts. Which one suits you depends on your water and on whether you are happy to drill a hole in the benchtop.

Carbon block feeding your existing tap. The cartridge sits on the cold line and filters everything that comes out of the cold side of your kitchen mixer. Nothing goes on the benchtop. The catch is that washing-up water goes through the cartridge too, so it wears out sooner for the water you actually drink. The Brita mypure A1C works this way.

Carbon block with its own filtered tap. The filter supplies a separate small tap, so only drinking and cooking water passes through it. You need a hole in the benchtop or sink for the tap. Some makers sell a three-way mixer instead, which pours hot, cold and filtered water from one spout and uses the hole your mixer already has. The Philips AUT9333/79 and the Shield twin kit are this type.

Reverse osmosis. Water is pushed through a membrane that holds back dissolved salts, hardness minerals and fluoride, with carbon stages before and after it. An RO system needs its own tap, a drain connection, and in the tankless designs a power point under the sink. It also sends some water to the drain.

Type	Reduces	Does not reduce	Installation	Price range
Carbon block, existing tap	Chlorine taste and odour; lead and PFAS if certified	Fluoride, hardness, dissolved solids	Cold-line connection	$100–$320
Carbon block, own tap	Same as above	Same as above	Cold-line connection plus a tap hole	$100–$300, more with a three-way mixer
Reverse osmosis	Dissolved solids, hardness, fluoride, plus what carbon removes	Very little, including the minerals you might want	Cold line, drain, tap hole, often power	$500–$900

If you are weighing the two main technologies in more depth, our reverse osmosis vs carbon filters comparison covers how each works.

Match the Filter to Your City’s Water

Australian tap water meets the ADWG in every capital, so an under-sink water filter is about taste, scale and personal choice, not safety. What the best under-sink water filter for your home should do differs by city. Here is the WaterScore data that matters for choosing one.

City	Hardness (mg/L)	Dissolved solids (mg/L)	Disinfectant	What to put under the sink
Sydney	31–58	65–158	Chloramine in about 6 in 10 suburbs, chlorine in the rest	Certified carbon block
Melbourne	8–108 (median 19)	Not in our data	Chlorine	Certified carbon block
Brisbane	53–115	Not in our data	Chlorine and chloramine	Certified carbon block
Adelaide	87–136	263–468	Chlorine, chloramine in some zones	Reverse osmosis if taste or scale bothers you
Perth	29–228 by locality	Varies by area	Not in our data	Reverse osmosis in the hard northern suburbs
Canberra	36–37	72–74	Chlorine	Certified carbon block
Hobart	18–80 (median 30)	39–186	Chlorine	Certified carbon block

The ADWG aesthetic guideline is 200 mg/L for hardness and 600 mg/L for TDS, the measure of dissolved solids.

Soft-water cities need only carbon. Sydney, Melbourne, Canberra and Hobart have soft water, and Brisbane’s is moderate at worst, so limescale is rarely the problem to solve. A certified carbon block removes the chlorine taste, which is the most common reason people filter.

Chloramine is slower to remove. Sydney Water disinfects about six in ten suburbs with chloramine, and Seqwater uses it in parts of South East Queensland. Carbon removes chloramine more slowly than chlorine, which is why NSF/ANSI 42 has a separate chloramine claim. None of the carbon filters we checked holds it, so expect a smaller taste improvement in chloramine suburbs than in chlorine ones. Our chlorine in Australian tap water analysis has the levels by city.

Adelaide and Perth are where reverse osmosis pays off. Metro Adelaide sits at 87 to 136 mg/L of hardness, and dissolved solids reach 468 mg/L in some suburbs. Perth’s northern suburbs on groundwater reach 228 mg/L of hardness. A carbon block will not touch either. An RO system takes most of the dissolved solids out, which you will notice in the taste and in the kettle. See our Adelaide and Perth hardness guides for your suburb.

Fluoride and PFAS are choices, not needs. Every capital adds fluoride at levels within the ADWG, and carbon filters leave it in. If you want it out, you need reverse osmosis; our fluoride in Australian tap water article has the levels by city. For PFAS, the latest results in every capital that publishes them are below the 2025 guidelines, as our PFAS results by city show. If your town has had detections, the Philips pick below is the only under-sink carbon filter we found that is certified to reduce PFAS.

The Best Under-Sink Water Filters in Australia, Reviewed

1. Best overall: Philips AUT9333/79 PFAS Pro

$279 at Amazon Australia · WaterMark 060212

The AUT9333/79 is a carbon block cartridge that sits in the cupboard and feeds its own chrome filtered tap. It carries WaterMark certificate 060212, issued against AS 3497:2021 [2], and it has the strongest set of certified claims of any under-sink filter we checked.

IAPMO R&T certifies it to NSF/ANSI 42 for chlorine taste and odour, to NSF/ANSI 53 for lead, cysts and total PFAS, and to NSF/ANSI 401 for microplastics [8]. In the certification testing it cut total PFAS from 2.16 µg/L to 0.02 µg/L or less, a reduction of at least 99.27%, and lead from 0.15 mg/L to 0.005 mg/L or less [9]. Both test levels are many times higher than Australian mains water results.

The AUT833/79 cartridge lasts 12 months or 7,286 litres, and the supplied tap pours 4.1 litres a minute. Philips had not published an Australian price for the cartridge when we checked, so ask before you buy. Two parts of the Amazon listing go beyond the paperwork: it quotes up to 17,978 litres, where the data sheet gives 7,286 for every claim, and it says no professional plumbing is needed, where Philips Australia says to use a licensed plumber [10].

If you would rather not drill a hole for a second tap, the same filter is sold with a three-way mixer for $502.40 in chrome or $565.20 in matte black. Bunnings sells the filter as the Philips FastFlow for $299.

Best for: chlorine taste in any soft-water city, and households in towns with past PFAS or lead concerns. It is new on Amazon Australia and has no owner ratings there yet.

Check the price on Amazon

2. Best if you want to keep your tap: Brita mypure A1C

$310.95 at Brita Australia · WaterMark 060031

Brita’s mypure A1C kit has no tap. It connects to the cold line and feeds your existing mixer, so nothing changes above the bench. It carries WaterMark certificate 060031 [3]. NSF lists Brita’s mypure A1 system with the A1000 cartridge, the one this kit uses, under NSF/ANSI 42 for chlorine taste and odour, over a service life of about 10,000 litres [11].

That is the only certified claim, so this is a taste filter, not a lead or PFAS filter. Brita says to change the A1000 cartridge every six months at most, and it costs $113.35, which comes to about $227 a year, the highest running cost of our carbon picks. Every litre from the cold tap goes through it, including washing-up water.

Best for: renovated kitchens where you do not want another tap, in soft-water cities with a chlorine taste.

See the kit at Brita Australia

3. Best reverse osmosis under-sink filter: Waterdrop X8

$719.20 at Amazon Australia · WaterMark 032422

The X8 is a tankless reverse osmosis system, and it is the only one of the RO units we checked with both WaterMark and a certified reduction claim. Its WaterMark certificate, 032422, lists the WD-X8 model sold on Amazon Australia [4]. IAPMO R&T certifies it to NSF/ANSI 58 for dissolved solids and to NSF/ANSI 42 for chlorine taste and odour [12]. In testing it cut TDS from 750 mg/L to no more than 187 mg/L, a 96.8% reduction [13].

Be clear about what is not certified. The Amazon listing says it reduces fluoride, lead and PFOA and PFOS. Waterdrop’s own sheet says those results come from a third-party laboratory test rather than certification. Its test did show fluoride falling from 8.0 to 0.16 mg/L, which is what you would expect of an RO membrane, but treat the certificate as the only promise.

It needs a power point under the sink and a drain connection. Waterdrop rates it at two litres filtered for every litre sent to the drain, a figure that isn’t certified. Running it costs about $280 a year: the pre-filter every six months, the post-filter yearly and the membrane every two years. It has only 10 ratings on Amazon Australia, and it costs $899 on Waterdrop’s own Australian site.

Best for: metro Adelaide, Perth’s northern suburbs, and households that want dissolved solids down and, on Waterdrop’s own testing, fluoride too.

Check the price on Amazon

The Philips AUT8950/79 reverse osmosis tap also carries WaterMark (060214) and sells for $699 at Bunnings. Its only certification covers its lead-free materials, so none of its reduction claims is certified, and we left it out for that reason.

4. Best budget: Shield twin under-sink kit

$99.50 at Amazon Australia · WaterMark under the maker’s certificate 030064

Shield’s twin kit pairs a 1 micron sediment cartridge with a 0.5 micron carbon block and comes with its own filtered tap. It is the cheapest kit we found that a plumber can connect. Shield trades under Healthway Pure Pty Ltd, which holds WaterMark certificate 030064 for its two-stage quick-change systems, and the listing photos show the bracket stamped with that number [14]. The Amazon part number is not one of the model IDs on the certificate, so ask the seller to confirm the model before you buy.

None of its performance claims is certified. NSF has published a notice saying Shield filters are not certified by NSF [15], and we found no IAPMO or WQA listing either. Treat it as a basic chlorine taste filter. The cartridges last up to 12 months, and Shield’s two-year cartridge pack costs $59.50, about $30 a year. It has 13 ratings on Amazon Australia.

Best for: a cheap, legal taste filter in a soft-water city.

Check the price on Amazon

Puretec’s PureMix Z7 also carries WaterMark (074617). Puretec lists it at $456.66, with replacement cartridges at $205.28. We found no NSF/ANSI certificate for it, so its claims are the maker’s own.

Popular Under-Sink Filters on Amazon Without WaterMark

If you shop for the best under-sink water filter in Australia on Amazon, the models with the most reviews are imports that carry no WaterMark. Several are certified for less than their listings claim.

System	Amazon AU	What it is certified for	What the listing adds
Waterdrop 10UA	$99.99 · 4.5 ★ (13,215)	NSF/ANSI 42 chlorine taste and odour, 41,640 L	”Removes 99% lead, fluoride”
Waterdrop 15UA	$127.49 · 4.6 ★ (7,884)	NSF/ANSI 42 chlorine taste and odour	PFAS and lead reduction
Frizzlife MK99	$119.99 · 4.5 ★ (7,220)	NSF/ANSI 42 chlorine; NSF/ANSI 53 lead and cysts, 3,028 L	Double the certified capacity
Frizzlife SK99	$249.99 · 4.4 ★ (2,410)	NSF/ANSI 42 chlorine; NSF/ANSI 53 lead and cysts, 3,577 L	Chloramine, PFOA and PFOS
Waterdrop TSA	$224.99 · 4.5 ★ (2,340)	Low-lead parts only (NSF/ANSI 372)	PFAS, fluoride
iSpring RCC7AK	$503.42 · 4.6 ★ (13,987)	NSF/ANSI 58 for fluoride, lead, TDS and other metals	”1,000+ pollutants”
Geekpure 6-stage RO	$249.99 · 4.3 ★ (630)	None found	NSF certification; NSF has issued a notice about unauthorised use of its mark [16]

Certifications are from the IAPMO R&T and NSF listings [17][18]. Some of these are good filters on paper. The Frizzlife MK99 is certified for lead, and the iSpring RCC7AK holds a genuine NSF/ANSI 58 certificate that includes fluoride. But the rule is simple. It is legal to sell a filter without WaterMark, and a licensed plumber is not permitted to install one [6]. Fitting an under-sink filter is licensed work in every state we checked, so there is no legal way to connect these to your drinking water, and we don’t recommend them for under-sink use.

Installing an Under-Sink Filter in Australia

Under-sink filters are on the WaterMark Schedule of Products as “water filters and water treatment appliances”, certified against AS 3497:2021 [32]. The Australian Building Codes Board spells out what that means: a product of a listed type must be WaterMark certified before it can be installed, and it must be installed by a licensed plumbing practitioner [6].

State licensing rules say the same. In NSW, Victoria, Queensland, South Australia and Western Australia, homeowners may do only minor work such as replacing a tap washer or a shower head [7][23][24][25][26]. Connecting a filter to the cold water line is licensed plumbing work, and in NSW doing plumbing work without a licence can bring a fine of up to $22,000 for an individual [7]. Queensland and Western Australia do let you replace a filter cartridge yourself.

What it costs. The Quote Yard, a Queensland quotes site, puts the labour for a single or twin cartridge system at $150 to $350, and a reverse osmosis system at $500 to $1,200 fully installed [27]. Plumbers generally charge $80 to $100 an hour [28]. If the filter has its own tap, check that the quote includes drilling the hole.

Engineered stone benchtops. Since the 2024 ban, cutting or drilling an existing engineered stone benchtop is regulated work. Safe Work Australia says a business doing it must notify the WHS regulator first and control the dust, although Victoria does not require the notice [29]. A three-way mixer, which uses the hole your mixer already sits in, avoids the issue.

Lead-free fittings. Since 1 May 2026, makers can only produce lead-free WaterMark-certified plumbing products. Plumbers can keep fitting existing certified stock until 1 May 2028, but in Victoria anything containing brass that touches drinking water must already meet the lead-free limit when it is installed [30][34].

Renting? You need your landlord’s written consent, and you may have to remove it when you leave. Our best water filter for renters guide covers filters that need no plumbing.

Preventing Leaks Under the Sink

Leaks are the complaint that comes up most in Australian owner reviews. Filter housings crack, push-fit fittings let go, and because the cupboard is closed a slow leak can run for days. The Stefani Twin, sold at Bunnings, averages 2.3 out of 5 from 49 ProductReview reviews, many of them describing floods [19].

A few steps cut the risk:

1. Check your water pressure. Victoria’s plumbing regulator treats static pressure above 500 kPa inside a home as needing a pressure-limiting valve [20]. Ask your plumber to measure it when they fit the filter.
2. Fit an isolation valve on the filter line, so you can shut the filter off without turning off the house.
3. Put a battery leak alarm in the cupboard. A four-pack of Geevon 100 dB leak detectors costs about $53 on Amazon Australia and has 4.5 stars from 946 ratings, so one alarm costs less than a cartridge.
4. Change cartridges on time, and hand-tighten housings rather than forcing them with a spanner. CHOICE warns that spent cartridges can themselves harbour microorganisms [31].

Running Costs: What Each System Costs per Year

The purchase price is only part of choosing the best under-sink water filter. Here is what each system costs to keep running, at the prices we found on 24 October 2026, before any plumber’s fees.

System	Price	Replacement parts	Yearly cost
Philips AUT9333/79	$279	AUT833/79 cartridge, 12 months	Not yet priced in Australia
Brita mypure A1C	$310.95	A1000 cartridge, $113.35, up to 6 months	About $227
Waterdrop X8	$719.20	Pre-filter $69.99 (6 months), post-filter $44.99 (12 months), membrane $189.99 (24 months)	About $280
Shield twin kit	$99.50	Two-year cartridge pack, $59.50	About $30
Waterdrop 10UA (no WaterMark)	$99.99	Replacement cartridge, about $40, 12 months	About $40
Frizzlife MK99 (no WaterMark)	$119.99	FZ-2 cartridge, $57.74, every 3 to 6 months	$115–$230
iSpring RCC7AK (no WaterMark)	$503.42	One-year filter set $154.57, plus a membrane every 2 to 3 years	About $170

If you are buying around a sale, our water filter deals page tracks when cartridges drop in price.

What You Can Do

1. Check your suburb’s water first. Look up your suburb on WaterScore, for example Adelaide or Sydney, for its hardness, dissolved solids, disinfectant and fluoride. Our water hardness calculator converts the hardness figure into the units filter makers use.
2. Decide what you want removed. Chlorine taste needs certified carbon. PFAS or lead needs an NSF/ANSI 53 claim for that contaminant. Hardness, dissolved solids or fluoride need reverse osmosis.
3. Look up the WaterMark number in the WaterMark product database, and check any removal claim on the certifier’s own listing.
4. Get a plumber’s quote that includes a pressure check. Ask them to fit a pressure-limiting valve if your pressure is above 500 kPa.
5. Renting? An under-sink filter needs your landlord’s written consent. Our best water filter for renters guide covers options that need no plumbing.

For filters matched to a particular suburb, see our filter pages for Adelaide, Perth and Sydney, the full best water filter Australia guide for jugs, or our best benchtop water filter guide for filters that need no plumber.

Frequently Asked Questions

What is the best under-sink water filter in Australia?

For most homes on mains water, the Philips AUT9333/79 PFAS Pro. It carries WaterMark and is certified to reduce chlorine taste and odour, lead and PFAS, for about $279. If your water is hard or high in dissolved solids, as in Adelaide and Perth’s northern suburbs, the Waterdrop X8 reverse osmosis system is the WaterMark-certified option we would buy. To keep your existing tap, the Brita mypure A1C fits under the sink and feeds it.

Do I need a plumber to install an under-sink water filter?

Yes. Under-sink filters are on the WaterMark Schedule of Products, so the National Construction Code requires a WaterMark-certified unit fitted by a licensed plumber. In NSW, Victoria, Queensland, South Australia and Western Australia, homeowners may only do minor jobs such as changing a tap washer, though Queensland and WA let you replace a filter cartridge yourself. Expect to pay roughly $150 to $350 to have a carbon system fitted.

Do under-sink water filters remove fluoride?

Carbon under-sink filters don’t. Reverse osmosis reduces fluoride along with other dissolved solids. The Waterdrop X8 is certified for dissolved solids, and Waterdrop’s own lab test showed fluoride falling from 8.0 to 0.16 mg/L, though that result isn’t certified. The iSpring RCC7AK is certified for fluoride reduction but has no WaterMark.

Is reverse osmosis better than a carbon under-sink filter?

Only if your water needs it. Reverse osmosis cuts dissolved solids, hardness and fluoride, which suits Adelaide and Perth’s harder suburbs. It costs more, needs a drain connection and often a power point, and sends water to the drain: Waterdrop rates the X8 at two litres filtered per litre wasted, while Puretec says its RO270 tank system makes about one litre for every two it rejects [33]. In soft-water cities like Sydney, Melbourne, Hobart and Canberra, a certified carbon block handles the chlorine taste most people want gone.

How often should you change an under-sink water filter cartridge?

Follow the maker’s schedule for your model. The Philips AUT833/79 cartridge lasts 12 months or 7,286 litres, the Brita A1000 up to six months, and the Shield twin cartridges up to 12 months. The Waterdrop X8 needs its pre-filter every six months, its post-filter yearly and its membrane every two years. Change sooner if the flow drops or the chlorine taste returns.

Are under-sink water filters from Amazon legal in Australia?

Buying one is legal, because plumbing products can be sold in Australia without WaterMark. Connecting it is the problem. A licensed plumber is not permitted to install an under-sink filter without WaterMark, and in the states we checked you can’t legally connect one yourself. Look up the model in the ABCB’s WaterMark product database before you buy.

Summary

The best under-sink water filter in Australia is one that carries WaterMark and is certified for what your water actually needs. For most households in soft-water cities that is a certified carbon block such as the Philips AUT9333/79, which also covers lead and PFAS. In Adelaide and Perth’s harder suburbs, a WaterMark-certified reverse osmosis system like the Waterdrop X8 is worth its higher running cost. Check your suburb’s numbers, check the certificate, and budget for a licensed plumber.

Sources

1. WaterMark product search — Australian Building Codes Board
2. WaterMark certificate 060212 (Philips AUT9333/79) — ABCB
3. WaterMark certificate 060031 (Brita mypure A1c) — ABCB
4. WaterMark certificate 032422 (Waterdrop X series) — ABCB
5. Simplifying performance standards for Australian drinking water treatment systems — Standards Australia, September 2021
6. What is WaterMark? — Australian Building Codes Board
7. Plumbing, draining and gasfitting licences — Building Commission NSW
8. Philips AUT9333/79 NSF/ANSI 53 certificate — IAPMO R&T (NSF/ANSI 42 and 401 certificates are listed alongside)
9. Philips AUT9333/79 performance data sheet — Philips
10. Philips under-the-sink system AUT9333/79 — Philips Australia
11. NSF certified drinking water treatment units — NSF (search “mypure” and “iSpring”)
12. Waterdrop WD-X8 NSF/ANSI 58 certificate — IAPMO R&T
13. Waterdrop X8 performance data sheet — Waterdrop
14. WaterMark certificate 030064 (Healthway Pure) — ABCB
15. Public notice: Shield water filter systems — NSF, August 2021
16. Public notice: Ningbo Eakar Appliance / Geekpure — NSF, January 2019
17. Waterdrop 10UA and 15UA NSF/ANSI 42 certificate — IAPMO R&T
18. Frizzlife MK99 and SK99 NSF/ANSI 53 certificate — IAPMO R&T
19. Stefani Twin Undersink Water Filter reviews — ProductReview.com.au
20. Practice note CW-03: Maximum static water pressure within a building — Building and Plumbing Commission Victoria
21. Australian Drinking Water Guidelines — NHMRC
22. How WaterScore calculates its ratings — WaterScore methodology and data sources
23. Engaging a plumber — Building and Plumbing Commission Victoria
24. Unregulated plumbing guide — Queensland Building and Construction Commission
25. Plumbing trades — Office of the Technical Regulator, South Australia
26. Tap into new plumbing rules for industry and homeowners — Building and Energy, Western Australia
27. Water filter and fridge water line installation costs, QLD — The Quote Yard
28. How much does a plumber cost? — Airtasker, March 2024
29. Engineered stone ban — Safe Work Australia
30. Lead free plumbing products — Australian Building Codes Board
31. Do you need a water filter in Australia? — CHOICE, March 2024
32. WaterMark Schedule of Products 2026-2 — Australian Building Codes Board, June 2026
33. RO270 reverse osmosis system — Puretec (user guide)
34. New lead-free plumbing product requirements — Building and Plumbing Commission Victoria