Chlorine in Shower Water: What It Does to Your Skin and Hair
If your skin feels tight and dry the moment you step out of the shower. If your hair has become progressively duller, more prone to breakage, or your colour fades weeks faster than it should. If you have eczema or dermatitis that topical treatments manage but never fully clear, there's a variable in your daily routine that most skincare advice never mentions: the chemistry of the water you're washing in.
The average Australian showers for 8 minutes a day, every day, for their entire adult life. In that 8 minutes, chlorine or chloramine, the disinfectants added to every Australian municipal water supply, are in direct, sustained contact with your skin, scalp and hair. They don't know they're supposed to stop working once they leave the treatment plant. They're still oxidising. And skin and hair are organic material.
Chlorine and chloramine are oxidising agents; their purpose is to destroy organic compounds. On skin, daily shower exposure strips sebum (the skin's natural protective oil), disrupts the skin microbiome, and degrades the skin barrier, contributing to dryness, sensitivity, and in susceptible individuals, eczema and dermatitis flares. On hair, chlorine oxidises the hair cuticle's lipid layer, causing structural damage, frizz, brittleness, and accelerated colour fade. Hard water compounds both effects by depositing mineral films on skin and hair with every shower. These aren't rare reactions or chemical sensitivities; they're the predictable result of daily contact between an oxidising disinfectant and the body's largest organ.
📋 Table of Contents
How Chlorine and Chloramine Damage Skin
Mechanism 1: Sebum stripping
Chlorine and chloramine are oxidising agents that break down lipids, meaning fats and oils. Sebum, your skin's natural protective oil, is a lipid. Daily shower exposure oxidises and strips this oil layer, leaving the skin barrier partially exposed. The result is the tight, dry, slightly uncomfortable feeling many people experience immediately after showering, particularly on the face, arms and legs. Over weeks and months of daily exposure, this chronic sebum stripping contributes to persistent dryness and increased transepidermal water loss (TEWL), the rate at which skin loses moisture to the environment.
Mechanism 2: Skin microbiome disruption
The skin hosts a community of beneficial bacteria that play a role in barrier function, immune regulation, and protection against pathogenic organisms. Chlorine and chloramine are bactericidal, again by design. Daily topical exposure disrupts the skin microbiome, reducing the diversity and population of protective bacteria on the skin surface. Research increasingly links skin microbiome disruption to eczema, rosacea, acne and general skin reactivity. For people in chloramine cities, this disruption occurs twice daily for those who shower morning and night, a sustained pressure on the skin ecosystem that skincare products largely cannot reverse while the source exposure continues.
Mechanism 3: Direct irritation and sensitisation
Chloramine is more chemically reactive with skin proteins than free chlorine at equivalent concentrations. Research has documented that chloramine-containing water can produce greater skin irritation responses than chlorinated water in controlled exposure studies, including increased erythema (redness), protein oxidation in the outer skin layer, and inflammatory cytokine signalling. For people with already-compromised skin barriers, such as those with eczema, rosacea or contact dermatitis, chloramine exposure can compound the existing barrier dysfunction, making the skin more permeable to other irritants and allergens.
Eczema, Dermatitis, and Shower Water
Australia has one of the highest rates of atopic dermatitis (eczema) in the world, affecting roughly 1 in 9 Australians. The relationship between chlorinated water and eczema has been studied for over two decades, and the weight of evidence increasingly points to shower water chemistry as an underrecognised contributing factor for some people, though it's one factor among several rather than a sole cause.
Multiple peer-reviewed studies have examined the relationship between domestic water chemistry and atopic dermatitis. A body of research has found associations between residential water chlorine and chloramine concentrations, water hardness, and eczema prevalence or severity, particularly in children. The proposed mechanism is consistent with what's known about barrier function: chlorine and chloramine oxidise skin proteins and lipids, can degrade tight-junction proteins in the epidermis, and increase skin permeability, which may allow allergens to penetrate more easily and trigger the immune responses that manifest as eczema flares.
The intervention evidence is more mixed. Some households report improvement after reducing chlorine exposure through point-of-use filtration or water softening, but a large randomised controlled trial of water softeners in children with eczema (the Softened Water Eczema Trial) did not show a statistically significant benefit over usual care. What's consistent is the biological plausibility: reducing the daily oxidative and irritant load on a compromised skin barrier is a reasonable thing to try alongside medical treatment, even where trial results vary. It's a low-risk change, not a substitute for dermatological care.
⚠️ The Sydney-specific note: Sydney switched from free chlorine to chloramine as its primary disinfection method in 2008. Chloramine is more persistent than free chlorine (it doesn't evaporate off hot water), harder to remove at the point of use, and has been shown in research to produce greater skin protein oxidation and barrier disruption than equivalent concentrations of free chlorine. For Sydney's 5+ million residents who've been showering in chloraminated water for almost two decades, this is an ongoing daily skin exposure that standard skincare routines don't address. The same applies in Brisbane and Adelaide, the other two chloramine capitals.
What Chlorine Does to Hair Structure
Hair structure is determined by the condition of the hair cuticle, the outermost layer of each hair strand, made up of overlapping scales coated in a thin lipid (fat) layer. This lipid layer determines shine, smoothness, moisture retention and resistance to breakage. Chlorine directly attacks it.
Structural hair damage
- Cuticle lipid layer oxidised and degraded
- Cuticle scales lift and roughen
- Cortex (inner structure) becomes exposed
- Protein bonds weaken over time
- Breakage increases, split ends multiply
Skin barrier effects
- Sebum (natural oil) stripped daily
- Skin microbiome disrupted
- Transepidermal water loss increases
- Skin permeability to irritants rises
- Chronic dryness, tightness, sensitivity
Scalp effects
- Scalp sebum stripped, overproduction response
- Scalp microbiome disrupted
- Dandruff and flaking can worsen
- Itchiness and scalp sensitivity increase
- Hair follicle environment compromised
Colour-treated hair
- Chlorine oxidises hair dye molecules
- Colour fades significantly faster
- Tonal shift, warmth strips first
- Porosity increases with each wash
- Colour uptake becomes uneven
The visible signs, dullness, frizz, increased breakage, are the downstream result of cuticle damage that accumulates with every shower. Hair doesn't become damaged all at once; it degrades progressively, which is why the connection to shower water chemistry is rarely made. The change is gradual enough to attribute to ageing, stress, product changes or seasonal variation, anything except the 8 minutes of chlorine exposure happening every single morning.
Colour-Treated Hair: Why Your Colour Fades Faster
For colour-treated hair, chlorine and chloramine present a specific problem. Hair colour, whether permanent, semi-permanent or toner-based, works by depositing pigment molecules within or on the hair shaft. Chlorine oxidises these molecules directly, accelerating their breakdown and causing the colour to fade. It's the same chemical reaction chlorine uses to bleach fabrics, just slower, and happening every morning in your shower.
Permanent hair colour lifts the natural melanin in the hair and deposits synthetic pigment molecules. Chlorine attacks both. It oxidises the deposited colour molecules, causing them to break down and fade, starting with the warmest tones (reds, coppers and golds), which have the most chemically reactive pigment structures. It also continues to oxidise natural melanin, which is why natural hair colour can shift over years of chlorinated water exposure. For semi-permanent colour and toners, which sit on the outside of the cuticle rather than penetrating it, chlorine exposure is even more damaging, since there's no structural barrier protecting the pigment at all.
The practical result: colour-treated Australians in Sydney and Brisbane (chloramine cities) often see faster fade than those in Melbourne or Hobart (free chlorine, soft water). In Perth and Adelaide, hard water adds its own colour-uptake problems on top. If you're getting your colour done every 4 to 6 weeks rather than every 8 to 10 weeks and your stylist can't explain why, ask them about your shower water chemistry before your next appointment.
How Hard Water Compounds the Damage
For residents in Perth, Adelaide, inland NSW and much of regional Australia, hard water adds a second layer of daily damage on top of the chemical effects of chlorine and chloramine. Hard water, water with elevated dissolved calcium and magnesium, leaves a mineral film on every surface it contacts, including your skin and hair.
On skin, this mineral film physically interferes with the skin barrier, blocking the natural moisturising factors in the epidermis and preventing emollients and moisturisers from penetrating effectively. Research has found that hard water exposure can worsen the severity of atopic dermatitis independently of water chlorine content, so the two effects are additive. Perth has the hardest water of any Australian capital (on free chlorine), and Adelaide combines chloramine with moderately hard River Murray water, so those two cities carry the most demanding daily skin and hair burden.
On hair, calcium and magnesium deposits coat the hair shaft with each wash, building up over time into a mineral layer that prevents moisture from entering the cuticle. The result is progressively dull, stiff, less manageable hair that becomes resistant to conditioning treatments, because the conditioning agents can't penetrate the mineral coating to reach the hair shaft itself. The white residue on your shower screen is the same deposit building on your hair and scalp daily.
Who Is Most Affected
✓ You're most likely to benefit from a shower filter if you have…
- Eczema or atopic dermatitis, particularly if flares are chronic and topical treatments provide only temporary relief; chlorine and chloramine exposure is a recognised trigger
- Dry, tight skin after every shower, the classic sign of daily sebum stripping by chlorine or chloramine
- Sensitive or reactive skin, since increased permeability from barrier disruption makes sensitised skin more reactive to all environmental exposures
- Colour-treated hair, since chlorine directly accelerates colour fade; filtering shower water can extend time between colour appointments
- Dry, brittle or frizzy hair, from structural cuticle damage; hard water mineral deposits compound this in Perth, Adelaide and inland NSW
- Dandruff or itchy scalp, where scalp microbiome disruption from chlorine and chloramine exposure is an underrecognised contributor
- Babies and young children, whose thinner, more permeable skin makes them more vulnerable to chlorine, chloramine and hard water effects; dermatologists increasingly suggest shower or bath filtration for infants with sensitive skin
- Anyone in Sydney, Brisbane or Adelaide, the chloramine cities, where the disinfectant is more persistent and harder to remove without a filter
What to Do About It
The most direct solution is filtering your shower water at the point of use, reducing chlorine, chloramine and heavy metals before they reach your skin, scalp and hair. The HolyH₂O Shower Mate installs between your existing shower arm and shower head in under 2 minutes, with no tools, no plumber and no new shower head. Its KDF and catalytic carbon media reduce both free chlorine and chloramine (so it suits every Australian city) along with heavy metals, and it fits every standard Australian ½" shower arm.
If you'd rather replace your shower head entirely with a filtered system, the HolyH₂O Shower Max uses the same filtration media in a full filtered shower head. Same media, same standard, same Lifetime Guarantee, with a new shower head at the same time. The difference between the two is form factor, not filtration, so pick based on whether you want to keep your current shower head or swap it. The next post in this series covers the evidence for whether shower filters actually work, and Part 4 walks through the exact differences between Shower Mate and Shower Max.
💧 The bottom line: the symptoms most commonly attributed to "sensitive skin," "bad hair genetics" or "needing better products" are frequently the predictable result of 8 minutes of daily chlorine and chloramine exposure. Moisturisers, conditioning treatments and topical creams treat the downstream effects. Filtering your shower water addresses the daily source. Read Part 3: Do Shower Filters Actually Work? →
Frequently Asked Questions
Can shower water cause eczema?
Shower water doesn't cause eczema; atopic dermatitis has genetic and immune components. But chlorine and chloramine exposure in shower water is a recognised trigger for eczema flares and a contributing factor in the barrier dysfunction that makes eczema worse. Research has found associations between residential water chlorine content and eczema severity, though intervention trials have been mixed. If you have eczema that's managed but never fully controlled, shower water chemistry is worth addressing alongside topical treatments and your doctor's advice.
Does chlorine make hair fall out?
Chlorine and chloramine don't typically cause clinical hair loss (alopecia), but they do cause structural hair damage that leads to increased breakage, which can present very similarly to hair loss in the shower and on the brush. The oxidative damage to the hair cuticle weakens the hair shaft along its length, making it more prone to snapping. Over months and years of daily exposure, this accelerated breakage can produce noticeably thinner-looking hair even without any change to the hair follicle itself.
Why does my hair colour fade so quickly?
If you're in a chloramine city (Sydney, Brisbane, Adelaide), chlorine oxidation of your hair dye molecules is a primary cause of fast colour fade, and free chlorine in the other capitals does the same at a lower level. Chlorine attacks the pigment molecules deposited by hair colouring, particularly the warmest tones, causing them to break down with every shower. Hard water (notably in Perth and Adelaide) compounds this by building mineral deposits on the hair shaft that interfere with colour uptake. A shower filter that reduces chlorine before it reaches your hair can extend the life of your colour.
Is chloramine worse than chlorine for skin and hair?
For shower water purposes, generally yes. Chloramine is more persistent than free chlorine; it doesn't evaporate off hot water, so it stays fully active throughout your entire shower. Research has found that chloramine can produce greater skin protein oxidation and barrier disruption than free chlorine at equivalent concentrations. It's also harder to remove at the point of use, needing KDF and catalytic carbon rather than standard activated carbon alone. Sydney, Brisbane and Adelaide are the chloramine cities; the rest of the capitals use free chlorine.
Will a shower filter help with dandruff?
Dandruff has multiple causes: fungal overgrowth (Malassezia), dry scalp, and inflammatory scalp conditions are the most common. Chlorine and chloramine exposure can contribute through scalp microbiome disruption and scalp barrier damage. Reducing chlorine and chloramine in shower water lowers the daily antimicrobial pressure on the scalp microbiome and the stripping of scalp sebum, which may improve symptoms, particularly in people with dry-scalp dandruff rather than oily or fungal dandruff. It's one variable among several, but it's a daily one.
🚿 Shower Water Series, 2026
- Part 1, What's Actually in Your Shower Water?
- Part 2, Chlorine in Shower Water: What It Does to Your Skin and Hair (this article)
- Part 3, Do Shower Filters Actually Work? What the Evidence Shows
- Part 4, Shower Mate vs Shower Max: Which Filter Is Right for You?
- Part 5, Best Shower Filter in Australia 2026
Soaking in a bath? The same chlorine and chloramine exposure that affects your shower applies in the bath, with even longer skin contact time. The HolyH₂O Bath Mate is designed specifically for bath water, reducing chlorine and common impurities for a gentler, cleaner soak for the whole family, including babies with sensitive skin.
Stop the Daily Damage, Filter Your Shower
The HolyH₂O Shower Mate installs in under 2 minutes between your existing arm and shower head. Its KDF and catalytic carbon media reduce chlorine, chloramine and heavy metals, so it suits every Australian city. No tools, no plumber, no new shower head. Lifetime Guarantee. Ships from Sydney.
Shop the Shower Mate →
😇 Hydration is our love language. 💧 Better water, better health. Sydney-based, Aussie-owned, and obsessed with helping families drink cleaner, smarter water every day.
Disclaimer: Information in this article is sourced from peer-reviewed research and publicly available dermatological literature, current as of July 2026. It's for educational purposes only and doesn't constitute medical advice. Intervention evidence on water treatment and skin conditions is mixed. If you have a skin condition, consult a qualified dermatologist for personalised treatment guidance.