Chlorine is not good for sunburn. It makes things worse. Chlorine strips natural oils from your skin, and sunburned skin has already lost much of its protective barrier. Exposing a sunburn to chlorinated pool water increases irritation, drying, and the risk of slowing your healing.
Why Chlorine Irritates Sunburned Skin
Chlorine is an oxidizing chemical. When it contacts moisture on your skin, it forms acids that break down tissue at a cellular level. On healthy skin, the effects are mild: maybe some dryness or tightness after a swim. On sunburned skin, the damage compounds. Your skin’s outer barrier is already inflamed and compromised, so chlorine penetrates more easily and causes more harm.
The practical effects are hard to miss. Chlorine and salt both strip natural oils from skin, leading to tightness, flaking, and itching. If you already have a sunburn, these symptoms get significantly worse. People prone to sunburn or chronic skin irritation often find that even a single swim in chlorinated water triggers stinging, redness, and increased inflammation.
The Infection Risk With Blistered Sunburn
Severe sunburns that blister create what amounts to an open wound. The CDC recommends staying out of the water entirely if you have open cuts or wounds. While chlorine does kill most germs in properly treated pool water within minutes, it’s not a perfect disinfectant. Certain pathogens like Cryptosporidium can survive in chlorinated water for more than seven days. A blistered sunburn exposed to pool water faces both chemical irritation from the chlorine and a real risk of bacterial infection through broken skin.
If you do have to enter the water with minor skin damage, waterproof bandages that completely cover the area are the minimum precaution. But for a sunburn, which can cover large areas of your body, bandaging isn’t realistic. The better choice is to stay out of the pool until your skin has healed.
Saltwater Is Gentler, but Still Drying
Ocean water is a different story from chlorinated pools, though it’s still not ideal for a sunburn. Saltwater contains minerals like magnesium, calcium, and potassium that can gently exfoliate dead skin and have mild anti-inflammatory properties. Some people with conditions like eczema or psoriasis find short-term relief from ocean water, and saltwater can reduce surface bacteria.
The downside is that salt pulls moisture from your skin, leaving it tight and dry, especially if you’re already sensitive. On a healing sunburn, this drying effect can slow recovery and increase peeling. Saltwater may also irritate pores and cause inflammation with repeated exposure. It’s a step up from chlorine, but neither is a treatment for sunburn.
What to Do If You Swim With a Sunburn
If you end up in a chlorinated pool while sunburned, minimizing the damage comes down to a few steps. Rinse off with lukewarm water as soon as you get out. Chlorine residue lingers on skin after swimming, and the longer it sits, the more drying and irritation it causes. Use a gentle, fragrance-free cleanser rather than regular soap, which can compound the irritation. Then moisturize immediately after drying off with a rich, unscented product to help restore your skin’s barrier and lock in hydration.
Avoid hot water during your rinse. Hot showers feel harsh on sunburned skin and strip away even more of the moisture your skin is trying to hold onto. Lukewarm is enough to remove the chlorine without adding to the problem.
Protecting Your Skin Before You Swim
If your sunburn is mild and you’re determined to swim, a water-resistant sunscreen applied at least 15 minutes beforehand can serve double duty. The ingredients that make sunscreen water-resistant create a hydrophobic barrier between your skin and the water. This barrier doesn’t just block UV rays; it also reduces your skin’s direct contact with pool chemicals. Look for mineral sunscreens with zinc oxide or titanium dioxide, and choose products rated “very water-resistant” for 80 minutes of protection.
That said, sunscreen on top of an active sunburn can sting, and it won’t fully prevent chlorine from reaching damaged skin. The most effective protection is simply waiting. A mild sunburn typically heals within a week. Giving your skin that time before getting back in the pool means you avoid compounding the damage and let your body’s natural repair process work without interference.