Can Hard Water Cause Eczema or Sensitive Skin Flare-Ups?

6th August 2026

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If you suffer from sensitive skin or a skin condition like eczema or psoriasis, you’ll want to do all you can do to avoid flare-ups. You’ll probably be choosy about the skincare products you use, and you’ll have your own particular skincare and showering routine.

 

But did you know that the quality of your tap water could also be a factor in causing flare-ups? Researchers have found a clear link between eczema and hard water, which is water containing a high level of mineral deposits. Considering that over 60% of the UK is classed as a hard water area, this could be having a significant effect on eczema sufferers across the country. 

 

Here, we’ll explore how hard water affects your skin and triggers flare-ups, and how you can reduce irritation from hard water at home. 

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Mia Williams (Customer)
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What Is Hard Water and Why Does It Affect Your Skin?

Hard water is water that contains high levels of dissolved minerals, mainly calcium and magnesium. These minerals are picked up as rainwater and groundwater moves through rock and soil before reaching the mains water supply and eventually - your tap or shower head.

 

While harmless to drink, hard water behaves differently when it comes to your skin. It reacts with soaps and cleansers to form a residue that doesn’t rinse away easily. This film can sit on the skin’s surface, interfering with its natural protective barrier.

 

As a result, your skin may feel:

And unfortunately, it can also make existing skin conditions worse. 

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Can Hard Water Trigger Eczema Symptoms or Make Them Worse?

Yes - for people with eczema and other conditions such as dermatitis and psoriasis, exposure to hard water can trigger and exacerbate the symptoms. 

 

Research from King’s College London and the University of Sheffield has shown that hard water can damage the skin’s protective barrier, making it easier for irritants and bacteria to penetrate the skin. This weakened barrier allows moisture to escape more easily, increasing dryness and sensitivity. 

 

There is also evidence suggesting that living in hard water areas may increase the likelihood of developing eczema, particularly in children. While it isn’t the sole cause, it is considered an important environmental factor.

 

Lead author in the study, Dr Simon Danby, explained the links between eczema, hard water and genetics:

 

“Patients with eczema are much more sensitive to the effects of hard water than people with healthy skin. This increase in sensitivity is associated with a genetic predisposition to a skin barrier defect brought about by mutations in the gene encoding filaggrin. Filaggrin is a structural protein important for the formation of our skin’s barrier to the outside environment. Up to half of all people with eczema carry a filaggrin gene.”

 

As hard water damages the skin barrier, it can lead to increased itching, irritation and more frequent flare-ups. It can also cause greater sensitivity to both skincare products and environmental triggers. 

Hard Water vs Soft Water: Which Is Better for Eczema?

Soft water is generally considered to be much better for eczema-prone and sensitive skin. Because it contains fewer minerals, it allows cleansers to rinse off more effectively without leaving residue behind.

 

Compared to hard water, soft water:

  • Is gentler on the skin barrier
  • Helps retain the natural moisture in your skin
  • Reduces irritation caused by leftover mineral deposits

Reducing mineral content in tap water can also minimise the interaction between water and cleansing products that may otherwise aggravate the skin.

How Minerals Like Calcium and Magnesium Impact Sensitive Skin

The minerals most commonly found in hard water are calcium and magnesium. These minerals can play havoc with your skin’s natural balance, disrupting the skin barrier and increasing moisture loss. 

 

This leaves your skin more vulnerable to irritation, especially with repeated exposure over time. 

 

When these minerals come into contact with cleansers, they also create insoluble compounds that leave behind a film on the skin. This residue doesn’t rinse away easily and can sit on the surface, interfering with the skin’s natural barrier function.

 

Over time, this can:

  • Prevent the skin from retaining moisture effectively
  • Increase transepidermal water loss (TEWL)
  • Leave skin feeling dry, tight and less flexible.

How to Reduce Skin Irritation from Hard Water at Home

If hard water is affecting your skin, there are several practical steps you can take:

  1. Install a shower head filter - solutions like the Curo Filtered Shower Head remove minerals, chlorine, heavy metals and other contaminants from your water, before it touches your skin. This helps to protect the skin barrier and minimise irritation.
  2. Use gentle, fragrance-free cleansers - it’s best to avoid harsh soaps that react strongly with hard water and leave residue behind.
  3. Moisturise immediately after washing - this helps restore hydration and reinforces the skin barrier.
  4. Avoid very hot water - hot showers can worsen dryness and further weaken the skin barrier.
  5. Pat skin dry instead of rubbing - minimising friction helps to prevent additional irritation.
  6. Consider barrier creams or emollients - these create a protective layer that shields the skin from mineral buildup and environmental stressors.
     

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