If your child swam with a friend who turned out to have lice, the water is almost never the reason. The CDC says head lice can survive under water for several hours, and are unlikely to spread in a swimming pool. It is just as direct about pool chemicals: “chlorine levels in pool water do not kill head lice.” A pool neither gives lice nor gets rid of them. Lice spread mainly by head-to-head contact, and towels, hats, combs and brushes are a less common route.
Below, we walk through what the CDC and the American Academy of Pediatrics actually say about chlorine, nits, time under water and shared gear, where a pool day really does pass lice along, and what to check at home afterward.
What the CDC and AAP Say About Swimming and Lice
Here is the short version of the published guidance, before we get into the details.
| Question parents ask | What the source says | Source |
|---|---|---|
| Does chlorine kill head lice? | No. The CDC says, “Chlorine levels in pool water do not kill head lice.” | CDC |
| Can lice survive under water? | Yes, for a while. The CDC says head lice can survive under water for several hours. | CDC |
| Do lice spread in a swimming pool? | Unlikely. The CDC says head lice are unlikely to spread in a swimming pool. | CDC |
| How do lice mainly spread? | Head to head. The CDC says lice mainly spread by direct contact with the hair of a person who has them, and the AAP points to close, prolonged head-to-head contact. | CDC and AAP |
| Can towels, combs, brushes or hats spread lice? | Less commonly, yes. The CDC lists “using infested combs, brushes, or towels” and wearing clothing such as hats worn by someone with lice. The AAP calls sharing combs, brushes, hats and sports helmets a very small chance. | CDC and AAP |
Those rows come from two pages we re-read on October 28, 2026: the CDC’s About Head Lice page and the American Academy of Pediatrics’ parent guide on HealthyChildren.org, which the AAP last updated in September 2022. Every medical statement in this article comes from those two pages or from the CDC’s treatment page, which we link further down. Where they do not address a question, we say so rather than fill the gap.
Does Chlorine Kill Lice or Nits?
No. The CDC’s sentence on this is one line long and leaves no room: “Chlorine levels in pool water do not kill head lice.” An afternoon in a chlorinated pool is not a treatment, and it will not shorten one that is already underway.
Nits, the eggs, are a separate question, and the two pages we reviewed do not answer it head-on. The CDC statement is about head lice. Neither the CDC nor the AAP says that chlorine, or pool water of any kind, kills nits. What they do say is that nits are anchored. The AAP describes eggs that “attach to the hair with a sticky substance that holds them firmly in place,” and the CDC tells parents to look for nits attached firmly within about a quarter inch of the base of the hair shaft.
The practical consequence for a parent is this: a swim does not clear a case, and a clean-smelling head is not a checked head. The CDC is blunt about the stigma, too, noting that “getting head lice is not related to cleanliness of you or your environment.” And never reach for pool chemicals as a home remedy. The AAP’s instruction is to “check with your child’s doctor before beginning any head lice treatment,” which is the right order of operations here.
Can Lice Survive Underwater, or Do They Drown?
They can hold out far longer than a swim lasts. The CDC says head lice can survive under water for several hours. A dip in the pool, a swim lesson, a long afternoon at the waterpark: all of that sits inside the window the CDC describes, so our reading is simple. Do not expect swimming to drown lice, and do not treat a long session in the water as a substitute for a head check.
The other half of the worry, whether a louse can swim across to your child, is easier to answer. Both sources describe lice as crawlers. The CDC says head lice move by crawling and cannot hop or fly, and the AAP puts it as “They cannot jump, hop, or fly.” Neither page describes lice swimming from one person to another, which fits the CDC’s finding that they are unlikely to spread in a swimming pool in the first place.
Away from a scalp, lice run out of time quickly. The CDC says adult lice will die within two days if they fall off a person and cannot feed. The AAP says they “can’t survive more than 1 day without a blood meal.” Two sources, two numbers, the same direction: a louse on a deck, in the water or on a dropped towel is on a short clock.
What About Salt Water, Lakes and Hot Tubs?
The CDC’s statement covers pool water, and that is where its precision ends. The CDC and AAP pages we reviewed do not list ocean, lake or hot-tub water as a treatment for head lice, and they do not list any of them as a route of spread either. The common-sense move, and we are labeling it as common sense rather than as a finding, is to treat a beach day, a lake day or an hour in a hot tub the way you would treat a pool day: do not count on the water to do anything about lice, and watch head contact and shared items instead.
Can Lice Spread From Pool Towels, Swim Caps and Shared Gear?
This is the part of a pool day worth your attention. Alongside head-to-head contact, the CDC lists less common routes: wearing clothing such as hats, scarves or sports uniforms worn by someone with lice, and “using infested combs, brushes, or towels.” The AAP sizes the same risk as a very small chance of spread from sharing items such as combs, brushes, hats and sports helmets. The CDC’s prevention advice is to not share combs, brushes or towels, and not to share clothing such as hats, scarves, coats, sports uniforms, hair ribbons or barrettes. It also helps to know the clock on the eggs. The CDC says nits cannot hatch and usually die within a week unless they stay at the temperature found close to the scalp.
Pool Towels and Lockers
Towels are the pool-bag item the CDC names, so treat them as personal property. Each child gets their own towel and their own comb or brush, labeled if the bag is headed somewhere crowded. Nothing in the CDC or AAP guidance tells you to bag a wet towel separately inside a shared locker or beach bag, but it is a sensible habit when four kids’ things are piled into one cubby, and it costs nothing. If a comb or brush did get passed around, that is also the moment to read up on how long head lice can live on a hairbrush rather than guess.
Swim Caps, Goggles and Other Headwear
Parents often ask about swim caps and goggles, so here is the straight answer: neither the CDC nor the AAP names them. The headwear those pages actually name is hats, scarves, hair ribbons, sports uniforms and sports helmets. A swim cap sits on the hair much the way a hat does, and a goggle strap runs across the back of the head, so keeping a cap and a strap personal is a reasonable precaution rather than a published finding. We would rather tell you which part is guidance and which part is judgment than dress one up as the other.
Where Lice Really Spread on Pool Day
Take the water out of the picture and you are left with the thing both sources put first. The CDC says the most common way to get head lice is head-to-head contact with a person who already has them, and its prevention advice names where that tends to happen: sports activities, the playground, slumber parties and camp. The AAP says the same in its own words, pointing to close, prolonged head-to-head contact.
A pool day is full of close-contact moments of exactly that kind. Two kids with their heads together over a phone on the deck, a huddle under the splash pad, a shared pillow at the sleepover after the party: those are our examples rather than anything the CDC or AAP lists, but they are the shape of the risk. If your summer runs through camp and sleepovers, we have written about how summer camp spreads lice head to head, about how lice spread in a shared bed, and about how head lice actually spread once the myths are stripped out.
What to Do After a Pool Day if Lice Might Be Involved
If a parent from the party sends the text nobody wants to get, you do not need to strip the house. You need a careful look at the hair and a short laundry list.
Check the Hair With a Fine-Tooth Comb
The AAP’s method is four steps: wet your child’s hair, comb through it in small sections with a fine-tooth louse or nit comb, wipe the comb on a wet paper towel after each pass, and repeat until you have been through the whole head. Do it in a brightly lit room, because, as the AAP says, “Live lice are hard to find. They avoid light and move quickly.” The CDC supplies the targets. Look for nits attached firmly within about a quarter inch of the base of the hair shafts, most often on the hair behind the ears and near the back of the neck, and keep in mind that finding a live nymph or adult louse is the best way to diagnose a case. The CDC also notes that a magnifying lens may help. For the longer walkthrough, see how to check your child for lice at home and how to use a lice comb.
Wash What Was Used in the Last Two Days
Both sources draw the same box around laundry. The CDC says to machine wash and dry clothing, towels, bed linens and other items the person wore or used during the two days before treatment. The AAP says you may want to wash clothes, towels, hats and bed linens in hot water and dry them on high heat if they were used within two days before lice were found and treated, and adds, “You do not need to throw these items away.” So the swim towels and the suit, yes. Beyond that, the CDC is explicit that spending much time and money on housecleaning is not necessary. There is more on where that line falls in what lice can survive on bedding.
Check the Rest of the Household
The AAP’s line here is short and worth following: all household members and close contacts should be checked, and treated if necessary. One checked head in a family of five is not a cleared house, which is why we wrote about why the whole family should be checked. If the pool day was part of a camp week, our summer camp lice prevention guidance covers the same checks in that setting.
When Is It Time for a Professional Lice Check?
Two statements from the sources set the bar. The CDC says misdiagnosis of head lice infestation is common, and that if you are not sure whether someone has head lice, you should see your healthcare provider. The AAP says head lice medicine should be used only when it is certain that your child has living head lice, and to check with your child’s doctor first.
When treatment does fail, the CDC’s Treatment for Head Lice page lists the reasons:
- Misdiagnosis
- Recent application of a combination shampoo/conditioner, or conditioner, to the hair
- Not following treatment instructions
- Head lice resisting the medication
- Reinfestation after successful treatment
That second item is easy to overlook after a swim. If your child rinses and conditions their hair afterward, note that the CDC says plainly, “Do not use a combination shampoo/conditioner, or conditioner, before using lice medicine.” If you are planning to treat at home that night, the order of your evening matters.
If you have looked twice and still cannot tell what you are seeing, or you have treated at home and the case has not cleared, a second set of eyes is reasonable. Lice Lifters clinics offer same-day lice checks, and treatment takes one visit, by appointment. You can find your nearest Lice Lifters clinic through our clinic finder and go from there.
Frequently Asked Questions
Does chlorine kill head lice?
No. The CDC says chlorine levels in pool water do not kill head lice. Pool chemicals are not a treatment, a shortcut or a backup plan, and a long session in the water will not shorten a case. If you do need to treat, the AAP’s advice is to check with your child’s doctor before beginning any head lice treatment.
Does chlorine kill lice eggs (nits)?
The CDC’s statement is about head lice, and neither the CDC nor the AAP says chlorine or pool water kills nits. What they do say is that nits are anchored: the AAP describes a sticky substance that holds them firmly in place, and the CDC tells you to look within about a quarter inch of the base of the hair shaft. Do not count on a swim to remove eggs.
Can lice survive underwater?
Yes, for a while. The CDC says head lice can survive under water for several hours, which is longer than a swim lesson, a pool party or an afternoon at the waterpark. That comparison is our reading of the timing, not a CDC statement about swim sessions. Either way, do not expect water to drown them.
Can you get lice from a swimming pool?
It is unlikely. The CDC says head lice are unlikely to spread in a swimming pool, and both the CDC and the AAP put head-to-head contact first, with combs, brushes, towels and hats a less common route. The pool itself is rarely the problem. What happens on the deck and inside the shared bag is the part worth watching.
Can you go swimming with head lice?
The CDC says lice are unlikely to spread in a swimming pool, so the water itself is not the concern. Head contact and shared towels, brushes and headwear are. Swimming is also not a treatment and will not clear a case. Pools, camps and swim programs set their own rules, and neither the CDC nor the AAP sets them, so check with yours.
Can lice spread through shared towels, goggles or swim caps?
Towels, less commonly, yes: the CDC names infested combs, brushes and towels, and the AAP calls sharing combs, brushes, hats and sports helmets a very small chance. Neither page names goggles or swim caps. Because a cap sits on the hair the way a hat does, keeping caps and goggle straps personal is a sensible precaution rather than published guidance.
Does ocean water or a hot tub kill lice?
The CDC’s statement covers pool water. The CDC and AAP pages we reviewed do not address ocean water, lakes or hot tubs, either as a treatment or as a way lice spread, so we will not claim an answer for them. Treat a beach day or a hot-tub day like a pool day: do not count on the water to do anything about lice.
Do you need to treat a pool after a lice case?
The CDC says head lice are unlikely to spread in a swimming pool, and its prevention advice is about people and shared items rather than water. The CDC and AAP pages we reviewed do not address treating, draining or shocking a pool after a lice case, so we do not recommend it either way. Put the effort into checking heads.
How quickly can Lice Lifters check for lice?
Lice Lifters clinics offer same-day lice checks, and treatment takes one visit, by appointment. If you have combed through the hair and still are not sure what you are looking at, a check is one way to get a straight answer instead of another guess. Use our clinic finder to find your nearest Lice Lifters clinic and book a time.
