Why your shower smells like chlorine
New Zealand town water is disinfected with free chlorine, and free chlorine comes off hot water in the steam. That pool smell is real, and it is the easiest part of your shower to change.
Free chlorine, and why a hot shower brings it out
Every New Zealand supplier keeps a small amount of chlorine in the pipes so the water stays safe all the way to your tap. Safe to drink, and chlorinated to stay that way.
Hot water lets it go
Free chlorine is volatile. Hot water and a fine spray in a closed shower push it into the air you are breathing.
That is why you smell it in the shower and barely notice it at the kitchen tap.
Cold water keeps it
Run the same water cold into a glass and most of the chlorine stays dissolved.
Same water, same chlorine. The temperature decides how much of it reaches your nose.
0.2 to 1.0 mg/L free chlorine as water leaves a New Zealand treatment plant
Source: Taumata Arowai learning hub, 2 September 2025.
Free chlorine the disinfectant on New Zealand town supplies
Source: Taumata Arowai, response to an official information request, 9 August 2024.
A pool-like smell in a hot shower is free chlorine, and in New Zealand that is the disinfectant on every town supply.
That matters when you choose a filter. Carbon holds free chlorine on a surface, while vitamin C converts free chlorine chemically as the water passes through.
See the chemistry page for how the reaction works and the test behind it.
What your supplier uses, city by city
Every row below is free chlorine. What changes from place to place is the supplier, the source and how long the chlorine has been there.
Christchurch
Why Christchurch notices it most
Christchurch went without chlorine for decades. The council began chlorinating in March 2018, and the regulator declined its exemption requests in November 2023. If your shower started smelling different around then, you noticed something real. Status as at October 2026.
Auckland
Watercare uses chlorine as the final stage of treatment. Its Ardmore plant doses about 1.2 mg/L, and the level measured further along the network, at Forrest Hill, sits around 0.6 to 0.8 mg/L.
Closer to a treatment plant, there is usually more of it. Source: Watercare, Ardmore chlorine information sheet, 11 June 2024.
Wellington city
Tiaki Wai doses about 0.6 to 0.8 mg/L at its plants and holds at least about 0.4 mg/L across the network.
What that means for a Wellington shower
Wellington water is soft, so there is no scale story here. Chlorine is the thing in your shower, and chlorine is what a vitamin C filter works on.
Hutt Valley and Porirua
Same supplier, same treatment
Tiaki Wai, which took over from Wellington Water on 1 July 2026, chlorinates all the water it supplies to Wellington, Porirua, Lower Hutt and Upper Hutt. The regulator declined an exemption for the bulk supply in February 2024.
Queenstown and Wānaka
Chlorinated to stay
Queenstown and Wānaka supplies are chlorinated on a permanent basis.
Everywhere else on town water
The Water Services Act 2021 expects council supplies to keep a disinfectant residual in the pipes, and free chlorine is how New Zealand does it.
What that means for your shower
If your water bill comes from a council or a council-owned supplier, chlorine is in your shower water.
Tank and bore water
Rain tanks and private bores are usually not chlorinated by anyone. Water New Zealand reported more than 225,000 people living off a municipal connection in 2019.
Figures as published by each supplier and the regulator, read 3 October 2026. Hardness is a different question from the smell, and it lives on the NZ Water Guide.
Free chlorine is what you smell, and New Zealand runs on it
New Zealand suppliers disinfect with free chlorine. Free chlorine leaves hot water easily, so the steam carries it.
So the smell is a fair test in every New Zealand city. Take the chlorine out at the shower head and the steam smells of the scent you picked, or of nothing at all.
If the smell is musty, earthy or metallic
That is a different cause. Call your council or supplier and check its current water-quality notices.
How to test the free chlorine in your shower water
Free-chlorine test strips cost a few dollars at a pool shop. A glass before and a glass after gives you your own answer, in your own bathroom.
- One. Fill a glass from the shower before you fit anything.
- Two. Fit the filter and run it for a minute.
- Three. Fill a second glass.
- Four. Read both against the colour chart in the same light. Film it in one take if you want to show someone.
Same water, same light, same chart. The two glasses do the talking.
The smell goes first
It is the change reviewers mention most, because it happens on the first shower.
The first thing I noticed was the chlorine smell disappearing almost instantly.
Verified review of a shower filter, ProductReview.com.au, August 2026. One person's experience.I genuinely didn't realise how harsh normal shower water smelled until it was gone.
Verified review of a shower filter, ProductReview.com.au, August 2026. One person's experience.Want proof that is yours rather than ours? The test strip above takes two minutes.
Warranty and support
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SUHAE hardware is covered for as long as you own it.
Cartridges are consumables and are replaced every two to three months. Terms and exclusions.
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Hardware made in Korea, sold to New Zealand by an Australian company, ABN 21 695 952 357.
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Send a photo of your shower on WhatsApp and get an answer within 24 hours.
Smell it, then lose it
Take the chlorine out of your shower with vitamin C.
Universal screws in behind the shower head you already own. Two minutes, by hand, no plumber.
SUHAE Universal fits between your shower arm and existing head, from NZ$49.90.