**Vegas Pools: City Fill Hiding Laser Burns?**

By Franklin Everett Shaw

December 19, 2025

The allure of Las Vegas is undeniable: dazzling lights, world-class entertainment, and, of course, the promise of poolside relaxation. But beneath the shimmering surface, a potential hazard lurks in those inviting turquoise waters, one that could leave you with more than just a tan. We’re talking about Cyanuric Acid (CYA), and the anecdotal evidence suggesting that high levels in Vegas hotel pools might be triggering unexpected sun sensitivity, even mimicking laser burn symptoms.

Let’s dive into this murky issue and equip you with the knowledge to protect your skin during your Vegas getaway.

Cyanuric Acid, or CYA, is a chemical stabilizer used in swimming pools to reduce the degradation of chlorine by sunlight. Without it, chlorine would dissipate rapidly, leaving the pool vulnerable to algae and bacteria. Think of it as sunscreen for your pool chlorine.

The problem? CYA doesn’t evaporate. It builds up over time, especially in indoor pools or those with infrequent water changes. High CYA levels reduce chlorine’s effectiveness as a sanitizer. To compensate, pool operators often add more chlorine, which can lead to skin and eye irritation.

Now, here’s where the “laser burn” anecdotes come in. High CYA can make skin more sensitive to UV radiation. This increased sensitivity, combined with the intense Vegas sun and potentially elevated chlorine levels, could manifest as a more severe sunburn than expected, sometimes described as feeling like a laser burn. It’s not actually a laser burn, but the sensation of intense, localized heat and redness can be similar.

So, how do you protect yourself? Knowledge is power.

First, test the CYA level yourself. Don’t rely on the hotel’s word. CYA test kits are readily available at most pool supply stores and even some larger retailers like Walmart or Target. Look for a kit that uses a turbidity test – you add a reagent to a sample of pool water and then compare the cloudiness to a chart. Taylor Technologies makes reliable kits, and you can find them online or at Leslie’s Pool Supplies. A good target CYA level is between 30-50 ppm (parts per million). Anything above 100 ppm is cause for concern.

Here’s a step-by-step guide to using a typical turbidity CYA test kit:

1. Collect a water sample: Use a clean container to collect a sample of pool water from about 18 inches below the surface.
2. Add the reagent: Follow the kit’s instructions to add the correct amount of CYA reagent to the sample.
3. Mix thoroughly: Gently swirl or invert the container to mix the reagent and water.
4. Compare to the chart: Look through the tube from the top, comparing the cloudiness of the water to the CYA level chart provided with the kit. Do this in bright, indirect sunlight for the most accurate reading.
5. Record the result: Note the CYA level in ppm.

If the CYA level is high, consider these actions:

• Choose a different pool: If possible, opt for a pool with lower CYA levels. Ask the hotel if they have multiple pools and if they can provide CYA readings for each.
• Limit your exposure: Reduce the amount of time you spend in the sun, especially during peak hours (10 AM to 4 PM).
• Shower immediately after swimming: Rinse off the pool water as soon as you get out to remove chlorine and CYA residue from your skin.

But the testing is only half the battle. A proactive skincare routine is crucial.

Before you even dip a toe in the water, apply a generous layer of a high-quality, broad-spectrum sunscreen with an SPF of 30 or higher. Look for sunscreens containing zinc oxide or titanium dioxide, as these provide excellent protection and are less likely to cause irritation. EltaMD UV Clear Broad-Spectrum SPF 46 is a popular choice among dermatologists and is widely available in the US. Reapply every two hours, or more frequently if you’re swimming or sweating.

• Pre-Swim Barrier: Consider applying a barrier cream before swimming. Products containing dimethicone can help protect your skin from chlorine and other pool chemicals. Vanicream Moisturizing Skin Cream is a good option for sensitive skin.

After swimming, it’s time for damage control.

• Gentle Cleansing: Use a mild, fragrance-free cleanser to wash away any remaining pool chemicals. Cetaphil Gentle Skin Cleanser is a classic choice that won’t strip your skin of its natural oils.
• Hydration is Key: Apply a rich moisturizer to replenish lost moisture. Look for ingredients like hyaluronic acid, ceramides, and glycerin. CeraVe Moisturizing Cream is a widely recommended and affordable option.
• Antioxidant Boost: Consider using a serum containing antioxidants like vitamin C or vitamin E. These can help neutralize free radicals caused by sun exposure and chlorine. The Ordinary Vitamin C Suspension 23% + HA Spheres 2% is a budget-friendly option.
• Aloe Vera for Soothing: If you do experience any redness or irritation, apply a pure aloe vera gel to soothe and cool the skin. Look for products with a high concentration of aloe vera and minimal additives.

One common mistake is assuming that all sunscreens are created equal. Many sunscreens on the market don’t provide adequate broad-spectrum protection, meaning they don’t protect against both UVA and UVB rays. Always check the label to ensure that your sunscreen is broad-spectrum and has an SPF of 30 or higher.

Another pitfall is neglecting to reapply sunscreen frequently enough. Sunscreen can wear off due to sweating, swimming, and toweling off. Set a timer on your phone to remind you to reapply every two hours, or more often if you’re active.

Finally, don’t underestimate the importance of hydration. Drink plenty of water throughout the day to keep your skin hydrated from the inside out. Dehydration can make your skin more susceptible to sun damage and irritation.

While the “laser burn” claims might be anecdotal, the potential for increased sun sensitivity due to high CYA levels in Las Vegas hotel pools is a real concern. By taking proactive steps to test the water, protect your skin, and stay hydrated, you can enjoy your Vegas vacation without risking a painful sunburn. Remember, a little preparation can go a long way in ensuring a safe and enjoyable poolside experience. Don’t let a bad sunburn ruin your trip to Sin City.