While hard water does not cause eczema, research shows it can make symptoms worse and may increase the risk of developing the condition.
Eczema, also called atopic dermatitis, is a chronic skin condition marked by inflammation, dryness and itching. For people with sensitive skin, even everyday environmental factors like the mineral content of tap water can influence flare-ups.
If you’ve ever noticed dry, tight skin after bathing or irritation that worsens after washing, the water coming from your tap could be part of the problem.
Does hard water cause eczema?
The short answer: no. Current studies suggest that hard water does not cause eczema outright. However, it can increase the risk of developing the condition and make symptoms worse in people with existing skin conditions such as atopic dermatitis and psoriasis.
For example, researchers studying atopic dermatitis patients have found that those living in hard water areas often report more flare-ups than those with soft water supplies. This is likely due to the way water hardness affects the skin barrier, making it more difficult for the skin to properly absorb moisture and therefore more vulnerable to subsequent skin irritation.
There is also growing evidence that hard water exposure in infancy can increase the likelihood of developing atopic eczema later in life. This risk is especially high for children with mutations in the filaggrin (FLG) gene, which normally helps maintain a strong barrier to lock in moisture and keep out allergens.
How hard water impacts eczema
So how does water hardness actually aggravate eczema? It comes down to the high levels of minerals dissolved in the supply. Hard water contains high concentrations of calcium and magnesium. These minerals interact with soaps and cleansers to create deposits of surfactants — especially sodium lauryl sulfate — that remain on the skin after washing.
These deposits can disrupt the skin barrier, which is already fragile in people with eczema. A weakened barrier lets in allergens and bacteria, raising the chance of inflammation and flare-ups. This cycle of mineral buildup, surfactant deposition and subsequent skin irritation could explain the association between hard water and eczema flare-ups.
Signs that hard water may be affecting your skin
For many people living in a hard water area, the signs might show up not only on faucets or shower doors but also on their skin. If you have eczema or atopic dermatitis, you may already be more sensitive to everyday irritants. Recognizing whether hard water exposure is contributing to flare-ups can help you take the right steps at home.
Common symptoms linked to hard water exposure include:
- Eczema flare-ups after bathing or hand washing: If your symptoms seem to spike after direct exposure to water, this could be a clue that water hardness is playing a role.
- Tight, itchy or dry skin after washing: Hard water often leaves a residue on the skin barrier. This buildup reduces natural moisture, making the surface feel uncomfortable, rough or itchy.
- Soap that won’t rinse away: When the minerals in hard water mix with soap ingredients, they can leave behind a thin residue on your skin. This buildup is a known contributor to subsequent skin irritation.
- Redness and inflammation: The same deposits that alter skin barrier function open the door to allergens and bacteria — two factors strongly linked with worsening atopic eczema.
Other possible contributors
It’s important to remember that hard water doesn’t account for every case of dry skin or inflammation. Climate conditions (like winter dryness), stress, harsh cleaning products and detergents can all trigger eczema symptoms. In some cases, hot water itself (not just water hardness) can strip the skin of natural oils and worsen damage to the barrier.
Because flare-ups are often the result of multiple factors, experts recommend looking for patterns. If irritation consistently follows washing, your home’s water quality may be part of the puzzle.
Culligan offers free in-home water testing to help identify whether your water contains elevated levels of hardness minerals. Testing provides clarity so you can determine whether a water softener or other adjustments may help reduce unnecessary exposure.
Schedule your free water test.
How to reduce eczema flare-ups from hard water
If you believe your eczema flare-ups are linked to hard water issues, here are a few practical steps you can take:
1. Adjust your bathing habits
Simple changes to how you bathe can go a long way in reducing flare-ups and protecting the skin barrier:
- Limit shower and bath time: Prolonged exposure to water can worsen dry skin, especially when the water is hot. Keeping showers short and lukewarm helps reduce damage to the skin barrier.
- Moisturize immediately after washing: Applying a moisturizer, ointment or lotion within three minutes of stepping out of the shower helps lock in moisture. This “three-minute rule” is often recommended in dermatology for managing atopic eczema.
- Use gentle cleansers: Many standard soaps contain harsh surfactants, which increase the risk of subsequent skin irritation. Fragrance-free, mild cleansers reduce unnecessary irritants.
2. Consider a water softener
A water softener works by removing calcium and magnesium ions from household water. This helps reduce the formation of soap scum and limits the mineral residue left behind on the skin barrier after washing. For people living in a hard water area, that can mean fewer daily irritants clinging to the skin.
It’s important to note that a domestic water softener is not a medical treatment for eczema or atopic dermatitis. However, by lowering exposure to the minerals that contribute to subsequent skin irritation, softeners may help reduce one of the environmental triggers that make flare-ups more frequent or severe.
Because every case of eczema is different, always consult with a dermatologist or healthcare provider before making changes to your treatment routine. A professional can help determine whether adjusting your home’s water hardness could complement other strategies you’re already using, such as moisturizers, prescribed ointments or lifestyle changes.
3. Try these lifestyle changes
Beyond bathing and water quality, daily routines also play a role in managing eczema symptoms:
- Moisturize daily: Regular use of fragrance-free ointments, creams or lotions can help restore moisture and reduce inflammation.
- Manage stress: Stress is a known trigger for eczema symptoms, and managing it may help lessen flare-ups.
- Work with a dermatologist: Because eczema is complex, professional guidance ensures the right balance of skincare, medical treatment and environmental adjustments.
Support your skin with cleaner water
If you’re managing eczema or simply dealing with the everyday effects of hard water, improving your home’s water quality can make a noticeable difference. A Culligan water softener reduces the calcium and magnesium minerals that cause buildup, soap scum and irritation, helping you protect your skin barrier and enjoy cleaner, soft water throughout your home.
The best way to know what’s in your water is to have it tested. Culligan makes it simple with a complimentary consultation. Get started by scheduling yours today.
