If your tap water in Brisbane, Ipswich, Logan or the Redlands has smelled or tasted a bit earthy and musty over the past few weeks, you're picking up on something real — and something that has happened before. Seqwater and local reporting flagged the very same shift in January 2022, and again in January 2025, when it was described as the fourth consecutive year the region had gone through it. The trigger both times was the same combination: a run of hot, wet weather feeding the catchment that supplies Mount Crosby, the treatment plant responsible for much of Brisbane's water. As Seqwater's Matthew McCahon put it during the January 2025 event, "it's a perfect storm of really hot weather, rainy weather, lots of nutrients and lots of sunlight that have created this."
What's Actually Changing — and Why It's Safe
The compounds behind the smell and taste are naturally occurring organics known as MIB and geosmin, produced by algae and micro-organisms that thrive when warm, nutrient-rich water sits around after rain. They're the same family of compounds responsible for the earthy smell of soil after rain — noticeable, not harmful. Seqwater has been direct about the distinction between taste and safety: McCahon addressed reports of symptoms linked to the water directly, saying "those medical symptoms are unrelated to the water. The compounds are non-toxic and are not harmful to humans." The supply continues to meet the Australian Drinking Water Guidelines throughout an event like this — what changes is how the water smells and tastes, not whether it's safe to drink.
Why Treatment Doesn't Make the Taste Disappear
It's worth understanding why a fully compliant, safe water supply can still taste different for weeks at a time. A treatment plant's job is to manage pathogens, sediment and chemical safety to a guideline standard — not to strip out every naturally occurring organic compound that affects taste and smell. Seqwater does actively work to soften the impact; during the 2022 event, the authority said it was "taking action to reduce the change as much as possible, including using the SEQ water grid to move water around" to blend affected supply with less-affected sources. But when an event is intense enough — 2025's was described as particularly so — some of that earthy character still reaches household taps before the weather, and the compounds behind it, settle down, typically within a matter of weeks.
Where Home Filtration Fits In
This is exactly the kind of gap a point-of-use filter is built to close. Activated carbon media — the Micro Carbon and Nano Fact Plus stages built into Ruhens benchtop purifiers, or the additional carbon and hollow-fibre stages in the standing WHP-3900 — works by adsorbing organic compounds as water passes through it, which is the general mechanism that gives carbon filtration its reputation for improving taste and odour rather than just managing sediment or chlorine. It doesn't replace what Seqwater and the treatment network already do to keep the supply safe; it picks up the part of the job a large-scale treatment plant isn't designed to finish — smoothing out exactly the kind of seasonal taste variation Brisbane households have now seen repeat across several summers. Given how reliably this comes back each year, having a filter already in place beats waiting out the weather each time.
A Few Practical Steps
- Chill it down. Cooler water reads as less earthy to most people — keeping a jug in the fridge helps in the meantime.
- Keep filter cartridges on schedule. Ruhens cartridges are designed to be swapped roughly every six months; a cartridge left in past that point won't perform at its rated level.
- Watch for Seqwater or council updates after unusually hot, wet stretches — that's the weather pattern behind this specific issue.
If this summer's taste change has you reaching for bottled water, a free consultation is a good place to start — we can talk through which Ruhens purifier fits your household and how its filtration stages handle exactly this kind of everyday water-quality frustration.