Wollongong Tap Water Quality 2026: Chloramine, the PFBA Detection and What Filters Work

6 min read

Wollongong’s water quality story has two distinct elements. The basic supply characteristics — soft, chloramine-disinfected, fluoridated, from a protected escarpment catchment — are straightforward. The PFAS picture is more nuanced: a PFBA spike detected at Illawarra WFP in November 2024 generated local concern, but PFBA currently has no ADWG health guideline, and the PFAS compounds that do have guidelines (PFOS and PFOA) are below updated June 2025 limits. Sydney Water’s declaration that Illawarra water is “PFAS-free” referred specifically to PFOS and PFOA. Understanding the distinction between different PFAS compounds — and what filtration addresses which — is the most useful thing a Wollongong resident can know.

Where Wollongong’s water comes from

Sydney Water manages the Illawarra water supply as part of its 12,700 km2 operational area covering Sydney, the Illawarra, and the Blue Mountains. The primary source is Avon Dam on the Avon River in the Illawarra escarpment ranges west of Wollongong. Fitzroy Falls Dam in the Southern Highlands provides supplementary supply. Raw water is treated at the Illawarra Water Filtration Plant (Illawarra WFP) located west of Wollongong before distribution into the Illawarra network.

The escarpment catchment — predominantly forested national park and protected land on the Illawarra Ranges — provides relatively clean source water with minimal agricultural or industrial contamination. The sandstone geology produces soft water low in calcium and magnesium, consistent with the soft water profile found across most of Sydney’s supply network. This is why Wollongong water does not have the hardness issues seen in cities like Perth, Adelaide, or parts of inland Queensland.

The November 2024 PFBA detection — what it means

In November 2024, a spike of PFBA (perfluorobutanoic acid) was detected at Illawarra Water Filtration Plant at 49 ng/L. This generated concern given the broader context of PFAS awareness in Australia. The important technical distinction: PFBA is a short-chain PFAS compound for which the Australian Drinking Water Guidelines currently set no health-based guideline value. The ADWG health limits apply to PFOS (8 ng/L), PFOA (4 ng/L), PFHxS, and PFBS. Illawarra WFP’s PFOS and PFOA results have been below these limits.

Sydney Water’s 2024 statement that Illawarra water is “PFAS-free” was specifically in relation to the regulated PFAS compounds with ADWG health guidelines — PFOS and PFOA. This is consistent with the NSW Government’s confirmation that all NSW water supplies meet the updated June 2025 ADWG limits. PFBA is detected in many Sydney-area water supplies, and research into its health effects and appropriate regulatory limits is ongoing internationally.

Friends of the Earth Australia’s independent analysis of PFAS detections across Sydney-area treatment plants found that PFBA spiked at multiple WFPs in October-November 2024, with Illawarra recording 49 ng/L on November 11. The cause is not definitively established — researchers have noted that rainfall events correlate with some detections, suggesting atmospheric deposition as one potential pathway. For a full explanation of the PFAS situation in NSW, see our comprehensive PFAS in Australian drinking water guide.

Wollongong water quality data

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Frequently asked questions

Safe to drink?

Yes — PFOS/PFOA below updated June 2025 ADWG limits. NSW Gov confirmed compliance.

PFAS? PFOS/PFOA below limits. PFBA spike (49 ng/L) detected Nov 2024 — no ADWG guideline for PFBA. RO removes short-chain PFAS.

Chloramine?

Yes — NSW-wide. Standard carbon filters insufficient. Catalytic carbon or RO required.