Australia’s mains water is generally well regarded and utilities publish their monitoring data. That is exactly why the interesting story is not “is it safe” but “where the guidelines just moved, and what one utility had to build when they did”.
In 2025 the PFAS numbers changed sharply. Understanding how they changed — and one live case in New South Wales — is more useful than any general claim about Australian tap water.
One clarification that most coverage skips: the old 70 ng/L figure was a combined limit for PFOS and PFHxS; the new 8 ng/L figure applies to PFOS alone. They are not the same measurement, so “ten times tighter” is not a like-for-like comparison. Where the two are directly comparable — PFOA — the value went from 560 to 200 ng/L, about 2.8 times tighter.
The guideline change
The NHMRC’s updated Australian Drinking Water Guidelines, published in June 2025, set health-based values of PFOA 200 ng/L, PFOS 8 ng/L, PFHxS 30 ng/L and PFBS 1,000 ng/L. The 2018 figures were PFOA 560 ng/L and a combined PFOS + PFHxS limit of 70 ng/L.
The PFOS number moved during consultation: NHMRC initially proposed 4 ng/L and settled on 8 ng/L, after commissioning a critical appraisal of benchmark models — including the US EPA’s — and favouring a “Gamma model”. A witness before a Senate committee described even 8 ng/L as close to a tenfold reduction on the 2018 guideline.
For a household, the practical reading is that the guidance moved toward precaution, not that your water suddenly became worse. These are national guidelines — “should not exceed” values — which each state puts into practice through its own regulation. They are not self-executing legal limits.
The Blue Mountains case, in detail
Sydney Water states that in August 2024 the Medlow and Greaves Creek dams were identified as having elevated PFAS and were isolated from supply. In December 2024 it commissioned a $3.4 million PFAS treatment system at the Cascade Water Filtration Plant using granular activated carbon plus ion exchange resin, with a ten-year design life.
As of its October 2026 update, the two dams remain disconnected and Cascade water continues to meet the ADWG PFAS values.
Two things are worth taking from that. First, the technology that actually works at utility scale for PFAS is GAC and ion exchange — not a A$30 jug filter. Second, the system was commissioned about four months after the dams were identified — which tells you how much treatment capacity matters relative to filtration at home.
The inquiry was not kind to the utility
The NSW Legislative Council select committee tabled its report on 11 September 2025 with 16 findings and 32 recommendations. Finding 1 is that Sydney Water did not perform “an appropriate level of due diligence” before claiming in June 2024 that there were no known PFAS hotspots in its drinking-water catchments. It also recommended PFAS blood testing for willing exposed community members.
The committee’s second finding concerns NSW Health expert advice. Separately from the committee, the International Agency for Research on Cancer classifies PFOA as carcinogenic to humans — worth knowing, but that is IARC’s assessment, not the committee’s.
Boil-water notices do happen
North East Water issued a precautionary boil-water advisory on 23 December 2025 for Wodonga and surrounding towns — Bandiana, Baranduda, Barnawartha, Bonegilla, Chiltern, Ebden, Kiewa, Killara, Leneva, Springhurst, Tangambalanga and the Logic Centre — after rainwater was believed to have entered a treated water storage tank during heavy rain. It was lifted on 24 December after network testing.
One day, one storm, a dozen towns and an industrial site. If you keep a filter for emergencies, this is the scenario it is actually for.
Water security, unevenly
Melbourne’s storages were 69.3% on 1 September 2026 — up 5.9% over winter, but 3.1% lower than a year earlier and more than 20% lower than two years earlier. Melbourne Water ordered 150 billion litres from the Victorian Desalination Plant for 2026/27 and states water restrictions are possible over summer 2026/27.
Elsewhere the picture is different: South East Queensland’s Water Grid storage was 81.8% at 30 September 2025 — well above the level at which drought response measures would begin, which is the opposite end of the spectrum from Melbourne.
Lower storages do not mean unsafe water. They shift source mix — more desalinated or more groundwater — which is typically a taste and hardness story rather than a health one. If your kettle scales faster in a dry year, that is why.
What household filtration is actually for in Australia
Australian utilities meet the ADWG at the plant. Filtration at home addresses the last metres and the last few percent:
- Old plumbing. Lead from pre-1980s solder and brass fittings is a real, localised risk that no national dataset measures.
- Taste and odour. Chlorine and chloramine, especially after a source switch or a main repair.
- Hardness and scale. Kettle scale, shower glass, appliance life. A salt-free conditioner changes how scale behaves; it does not soften water in the ion-exchange sense, and it does not remove contaminants.
- PFAS reassurance. If this is your concern, it needs a system with a certified PFAS reduction claim — typically reverse osmosis or a dedicated carbon/IX stage — and you should check the certification against the certifier’s public listing rather than the product page. A standard carbon jug filter is not a PFAS solution.
Under-sink systems · Shower filters · Whole house systems
Sources
- NHMRC, updated Australian Drinking Water Guidelines (June 2025) — nhmrc.gov.au
- Senate PFAS inquiry, Chapter 7 (guideline values and table 7.1) — aph.gov.au
- Sydney Water, PFAS treatment at Cascade Water Filtration Plant (October 2026 update) — sydneywater.com.au (PDF)
- NSW Legislative Council select committee report media release (11 September 2025) — parliament.nsw.gov.au (PDF)
- North East Water, Wodonga boil-water advisory — nerwa.vic.gov.au
- Melbourne Water, Water Outlook (storage and desalination) — melbournewater.com.au
- Seqwater water security update, September 2025 (PDF) — seqwater.com.au
- IARC classification of PFOA (independent of the NSW committee) — iarc.who.int