Posted by Omer Demir

What Chlorine in Shower Water Does to Hair and Skin

What Chlorine in Shower Water Does to Hair and Skin

Your morning shower delivers around 50 litres of chlorinated water straight onto your skin and scalp. Over a year, that adds up to roughly 18,000 litres. The chlorine in shower water is the same disinfectant that keeps swimming pools sterile, just at a lower dose, and it lands on your body every single day.

This article explains what that daily exposure does to your hair and skin, what the research actually supports, and what you can do about it. You will learn:

  • Why chlorine is in UK tap water, and at what levels
  • The specific effects on skin, hair and scalp
  • Which removal methods work, and which are wishful thinking

Table of Contents

Why Is There Chlorine in Your Shower Water?

Chlorine is added to UK tap water for a good reason. It kills bacteria and keeps water safe on its journey through miles of pipework to your home. The Drinking Water Inspectorate states that UK water companies typically keep residual chlorine at or below 0.5 mg/L, with most taps testing between 0.1 and 0.3 mg/L.

For drinking, those levels are safe and well below the World Health Organisation guideline of 5 mg/L. The problem is not safety. The problem is what a daily chemical rinse does to the outside of your body over months and years.

Showering changes the exposure in three ways. The water is hot, so your pores open. The volume is huge compared to what you drink. And the enclosed cubicle turns some of that chlorine into vapour that you breathe.

What Chlorine Does to Your Skin

Chlorine is an oxidising agent. On your skin, it attacks the thing your skin depends on most: its oil barrier.

Sebum is the thin layer of natural oil that keeps moisture in and irritants out. Chlorine strips it away with every shower. Water quality specialists at Clean Water Store note that this stripping effect leaves skin dry and tight, and hot water accelerates it by increasing absorption through open pores.

For most people, the result is dryness, itching and that squeaky feeling after showering. For people with existing conditions the stakes are higher. Research summarised by Kind Water Systems links chlorine exposure to flare ups of eczema, psoriasis and dermatitis, because compromised skin barriers are more vulnerable to chemical irritants.

Around 1 in 10 UK adults has eczema, so this is not a niche concern. If that includes you, our detailed look at hard water, chlorine and eczema covers the UK research in depth.

What Chlorine Does to Your Hair

Hair takes the same chemical hit, with more visible results.

Your hair is made of keratin, a protein held together by structural bonds. Chlorine oxidises keratin and roughens the cuticle, the protective outer layer of each strand. According to research reviewed by Afina, the visible outcomes are dullness, frizz and increased breakage.

Three groups notice it most:

  • Coloured hair. Chlorine oxidises dye molecules, so colour fades noticeably faster.
  • Dry or curly hair. These hair types depend heavily on natural oils, which chlorine removes.
  • Sensitive scalps. The same stripping that dries skin also dries the scalp, which contributes to itching and flaking.

An interesting pattern shows up in the reporting: many people never connect their hair problems to their water at all. As Clean Water Store observes, chlorine damage builds gradually, and most people only notice when they travel somewhere with different water and their hair suddenly behaves. If shedding and flaking are your main worries, see our guide to shower water, hair loss and dandruff.

The Inhalation Factor: Steam and THMs

The least known part of shower chlorine has nothing to do with your skin.

When chlorine reacts with organic matter in water, it forms byproducts called trihalomethanes (THMs). Hot shower water vaporises both chlorine and THMs, and an enclosed cubicle concentrates the vapour. Research cited by Afina notes that some THMs are classified as potential carcinogens, and that a warm shower creates a meaningful inhalation exposure route.

UK water is regulated to keep THM levels low, and this is not a reason for alarm. It is simply worth knowing that shower exposure is not limited to what touches your skin. The 10 minutes you spend in a steamy cubicle each day are part of the picture.

How to Remove Chlorine From Shower Water

You cannot ask your water company to skip the chlorine, and you would not want to. Removal has to happen at the point of use. Three methods actually work:

  1. Activated carbon filtration. Food grade carbon adsorbs chlorine and many contaminants as water passes through. It is proven, cheap and effective, though performance drops in very hot water.
  2. KDF-55 media. A copper and zinc alloy that converts free chlorine into harmless chloride through a redox reaction. It performs well in hot water.
  3. Vitamin C. Ascorbic acid neutralises both chlorine and chloramine on contact. We explain the chemistry in our guide to vitamin C shower filters.

What does not work: letting water "air out" (irrelevant at shower speed), mineral beads with vague claims, and shower heads that promise filtration but contain token amounts of media. Our honest guide to shower filters explains how to spot the difference.

The Proper Shower Head uses both activated carbon and a vitamin C capsule, so residual chlorine gets two chances to be caught before it reaches your skin.

Conclusion

Chlorine keeps UK water safe to drink, and it belongs there. But 18,000 litres a year of it lands on your skin and hair, stripping natural oils, roughening hair cuticles and aggravating conditions like eczema.

The key points to remember: UK shower water carries a residual chlorine dose at every use; the damage is cumulative rather than dramatic, which is why most people miss it; and point of use filtration with carbon, KDF or vitamin C is the only practical fix.

Your skin will tell you the difference within a few weeks of removing the daily dose. The Proper Shower Head comes with a 60 day trial for exactly that reason.

Frequently Asked Questions

Is there chlorine in UK shower water?

Yes. All UK water companies add chlorine as a disinfectant, and the residual level at your tap is typically between 0.1 and 0.5 mg/L. The same water supplies your shower.

Does chlorine in the shower damage hair?

Chlorine oxidises keratin and roughens the hair cuticle, which leads to dullness, frizz and breakage. It also accelerates colour fade in dyed hair.

Can chlorine in shower water cause dry skin?

Yes. Chlorine strips sebum, the skin's natural oil barrier. Combined with hot water, this leaves skin drier and more prone to irritation, especially for people with eczema.

Do you absorb more chlorine showering than drinking?

A hot shower opens pores and increases skin absorption, and steam vaporises chlorine so you inhale it too. Several researchers consider shower exposure comparable to or higher than drinking exposure.

How do I remove chlorine from shower water?

A filtered shower head with activated carbon, KDF or vitamin C media removes or neutralises most residual chlorine before it reaches your skin.