Whether you're spending summer at the pool or the beach, your skin is exposed to more than just the sun. Chlorine and saltwater can both impact skin health, but they don't affect the skin in the same way.

If you've ever noticed your skin feeling tight after a swim or wondered why certain environments seem to trigger dryness and irritation, the answer often comes down to how these water conditions interact with your skin barrier.

So, which is harder on your skin: chlorine or saltwater?

Understanding the Skin Barrier

Before comparing chlorine and saltwater, it's important to understand the skin barrier.

The outermost layer of the skin helps retain moisture and protect against irritants, allergens, and environmental stressors. When the barrier becomes compromised, skin can become dry, irritated, and more susceptible to inflammation (Elias, 2018).

Both chlorine and saltwater can influence the skin barrier, but through different mechanisms.

How Chlorine Affects the Skin

Chlorine is commonly used in swimming pools to kill bacteria and prevent the spread of waterborne illnesses. While effective for sanitation, it can also affect the skin.

Research has shown that repeated exposure to chlorinated water may disrupt the skin barrier and increase transepidermal water loss (TEWL), which can contribute to dryness and irritation (Engebretsen et al., 2017).

Common effects of chlorine exposure include:

• Dry, tight skin

• Increased skin sensitivity

• Itching

• Worsening of existing skin conditions in some individuals

People with eczema, sensitive skin, or already compromised skin barriers may be more likely to notice these effects (Nutten, 2015).

Why Does Chlorine Make Skin Feel Dry?

Chlorine can remove some of the natural oils that help protect the skin's surface. Without these oils, moisture escapes more easily, leaving skin feeling rough or dehydrated (Elias, 2018).

This effect becomes more noticeable with frequent swimming or prolonged pool exposure.

How Saltwater Affects the Skin

Saltwater has a more complex relationship with the skin.

Seawater contains minerals such as magnesium, calcium, potassium, and sodium. Some research suggests that mineral-rich water may help support skin barrier function and reduce inflammation in certain skin conditions (Proksch et al., 2005).

Many people report that their skin feels smoother or less inflamed after spending time in the ocean.

However, saltwater isn't always gentle.

As seawater evaporates, salt can remain on the skin's surface. This can draw moisture out of the skin and contribute to dryness, especially if the skin is already dehydrated or sensitive (Verdier-Sévrain & Bonté, 2007).

Common effects of saltwater exposure include:

• Temporary skin dryness

• Tightness after swimming

• Stinging on cuts or irritated skin

• Increased dehydration when not rinsed off

Which Is Harder on Your Skin?

For most people, chlorine is generally more likely to disrupt the skin barrier and cause dryness than occasional exposure to saltwater.

While both environments can leave skin feeling dehydrated, chlorine's purpose is to act as a disinfectant, which means it can be more aggressive toward the skin's natural protective oils (Engebretsen et al., 2017).

Saltwater may still cause dryness, but it also contains minerals that may offer some skin-supporting benefits for certain individuals (Proksch et al., 2005).

That said, everyone's skin responds differently. People with eczema, sensitive skin, or very dry skin may find that either environment triggers irritation.

How to Protect Your Skin

Whether you're swimming in a pool or the ocean, a few simple habits can help support your skin barrier.

Rinse Off After Swimming

Showering soon after swimming helps remove chlorine, salt, and other residues that can contribute to dryness.

Moisturize Immediately

Applying a moisturizer after swimming helps replenish hydration and support barrier recovery. Ingredients such as glycerin, hyaluronic acid, dimethicone, and ceramides can help reduce moisture loss (Lodén, 2003).

Don't Forget Sunscreen

Many people focus on water exposure and forget that ultraviolet (UV) radiation is often the biggest threat to skin health during a day outdoors.

A broad-spectrum sunscreen should be applied before swimming and reapplied according to product directions.

Pay Attention to Sensitive Skin

If you have eczema or frequently experience dryness after swimming, consider limiting prolonged exposure and prioritizing barrier-supporting skincare products.

Both chlorine and saltwater can affect your skin, but chlorine is generally more likely to contribute to dryness and skin barrier disruption. Saltwater may offer some benefits due to its mineral content, although it can still leave skin dehydrated if not rinsed away.

No matter where you're swimming, the best way to keep your skin healthy is to rinse off afterward, moisturize regularly, and protect your skin from the sun. Supporting your skin barrier can help minimize irritation and keep your skin comfortable all summer long.

Works Cited

Elias, P. M. (2018). Skin barrier function. Current Allergy and Asthma Reports, 18(6), 1–7. Link

Engebretsen, K. A., Johansen, J. D., Kezic, S., Linneberg, A., & Thyssen, J. P. (2017). The effect of environmental factors on skin barrier function and atopic dermatitis. Clinical and Experimental Allergy, 47(4), 488–498. Link

Lodén, M. (2003). Role of topical emollients and moisturizers in the treatment of dry skin barrier disorders. American Journal of Clinical Dermatology, 4(11), 771–788. Link

Nutten, S. (2015). Atopic dermatitis: Global epidemiology and risk factors. Annals of Nutrition and Metabolism, 66(Suppl. 1), 8–16. Link

Proksch, E., Nissen, H. P., Bremgartner, M., & Urquhart, C. (2005). Bathing in a magnesium-rich Dead Sea salt solution improves skin barrier function, enhances skin hydration, and reduces inflammation in atopic dry skin. International Journal of Dermatology, 44(2), 151–157. Link

Verdier-Sévrain, S., & Bonté, F. (2007). Skin hydration: A review on its molecular mechanisms. Journal of Cosmetic Dermatology, 6(2), 75–82. Link